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Remote Test Set
RTS-2 cover photo
Model RTS-2
Instruction Manual

©2011
IC Engineering, Inc.
PO Box 321
Owings Mills, MD
21117-0321 USA

Printed in the USA
January 2011 Revision

RTS-2 Features

Table of Contents

Compliance Notices

1. Introduction

2. Tests

3. Customization

4. The Multiple Module Configuration

5. In Case of Difficulty

6. Command Summary

U.S.A. Notice

This equipment complies with Part 68 of the FCC rules. On the bottom plate of this equipment is a label that contains, among other information, the FCC registration number and ringer equivalence number (REN) for this equipment. If requested, this information must be provided to the telephone company.

This equipment uses USOC (Universal Service Order Codes) jacks RJ-11C or RJ-21X.

The REN is used to determine the quantity of devices which may be connected to the telephone line. Excessive RENs on the telephone line may result in the device not ringing in response to an incoming call. In most, but not all areas, the sum of RENs should not exceed five (5.0). To be certain of the number of devices that may be connected to a line, as determined by the total RENs, contact the local telephone company.

If the RTS-2 causes harm to the telephone network, the telephone company will notify you in advance that temporary discontinuance of service may be required. But if advance notice is not practical, the telephone company will notify the customer as soon as possible. You will be advised of your right to file a complaint with the FCC if you believe it is necessary.

The telephone company may make changes in its facilities, equipment, operations or procedures that could affect the operation of the equipment. If this happens the telephone company will provide advance notice in order for you to make necessary modifications to maintain uninterrupted service.

Should trouble be experienced with the RTS-2, for repairs or warranty information contact IC Engineering, Inc. at www.ICengineering.com or 410-363-8748. If the equipment is causing harm to the telephone network, the telephone company may request that you disconnect the equipment until the problem is resolved.

No repairs are to be performed by the customer (user).

The RTS-2 cannot be used on public coin phone service provided by the telephone company. Connection to party line service is subject to state tariffs.

Canadian Notice

The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment will operate to the user's satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment must also be installed using an acceptable method of connection. In some cases, the company's inside wiring associated with a single line individual service may be extended by means of a certified connector assembly (telephone extension cord). The customer should be aware that compliance with the above condition may not prevent degradation of service in some situations.

Repairs to some certified equipment should be made by an authorized maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment.

Users should ensure for their own protection that the ground connections of the power utility, telephone lines and internal metallic water pipe system, are connected together. This precaution may be particularly important in rural areas. CAUTION: Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate.

The RINGER EQUIVALENCE NUMBER (REN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the REN of all devices does not exceed 5. The REN for the RTS-2 is 0.2.

Note

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: reorient or relocate the receiving antenna; increase the separation between the equipment and receiver; connect the equipment into an outlet on a circuit different from that to which the receiver is connected; consult the dealer or an experienced radio/TV technician for help.

The user is cautioned that changes or modifications not expressly approved by the party responsible for compliance can void the user's authority to operate the equipment.

1. Introduction

This chapter provides an overview of the environments where the Remote Test Set is utilized. Applications, definitions, overall features, hardware configuration, and installation are discussed.

1.1 How to Use This Manual

Sections 1.8-1.10 and chapter 2 are sufficient in many instances to cover the material required to install and operate the RTS-2. Should it be desired to alter the factory default parameters, chapter 3 is also required. To interconnect multiple RTS-2 units together, see chapter 4. If difficulties arise in using the unit, consult chapter 5. Perusal of the Table of Contents may help in locating specific information. In order to achieve maximum performance relative to specific needs, it is recommended that the entire manual be examined. Chapter 6 is included as a quick reference guide.

1.2 Applications

The RTS-2 finds application both by telephone company carriers as well as general telephone equipment users.

Remote Origination Testing

Local Telephone Companies (Telcos) and Long Distance Carriers program their respective switches for digit translation and feature access. After program modification in the switches, it is necessary to test the changes, as well as all previous programming options. In order to place test calls through these switches, a mechanism is needed to permit call origination from the access points. Traditionally, this has been done in two ways: physically driving to the locale served by the switch under test; and by the installation of foreign exchange lines between all desired test spots and a centralized testing location. Both of these methods are expensive.

The RTS-2 is installed at the remote test point and is connected to a minimum of two standard 2-wire dialup POTS lines. These lines may be dedicated to this one purpose, or shared with other equipment. In order to place test calls, the user dials into the access line and enters a secret authorization code to obtain command of the RTS-2. Next, for each test call to be made, the user enters codes which instruct the device to seize an outgoing line and dial a test number. The test call is halted by hanging up the outgoing line, but retaining the connection to the access line; this permits the placement of an unlimited number of test calls over one or more lines with a single access and authorization process. Upon the conclusion of the test session, the access line is relinquished.

The use of the RTS-2 permits the technician to test the switch immediately after reprogramming. It is also possible in many cases to perform a real-time trace function on the affected switch to follow the progress of the test call originating from the RTS-2. All of this can be done from the office telephone, no matter where that desk is located. Even in the situation where foreign exchange lines are used for access and test, the tests can only be conducted from the one central point where those lines terminate.

Test Tones

The RTS-2 units can be commanded to generate test tones, or a specific telephone line can be designated for a responder function. In the second case, dialing that telephone number causes the line to be answered, and a 1000 Hz test tone be delivered, without any authorization or command codes. This permits the use of otherwise idle RTS-2's as terminating test numbers. The designated responder line (when used for incoming calls) can still be used as an outgoing line through normal operation, when command of the RTS-2 is achieved via dialing the access line and entering an authorization code.

Call Forwarding

As a convenience, the outgoing lines can also be programmed to call forward to preprogrammed destination numbers. Outgoing test calls on these lines are not affected.

General Equipment/Line Testing

Nearly every business establishment utilizes Customer Premises Equipment (CPE) in order to provide for internal and external telephone communications. Typical products used are: mechanical and electronic Key Telephone Systems; Private Branch Exchange (PBX) switches; and hybrid systems, which are combinations of the two. Additionally, call sequencers and Automatic Call Distributors (ACD's) are placed into service to handle volumes of incoming traffic. CPE for the most part is universal with the one exception of Centrex service.

Premises equipment is either owned or leased by the end user, who is ultimately responsible for its maintenance. Typically, the end user contracts for such maintenance with an interconnect or service providing company. The CPE handles internal telephone calls entirely on its own. Incoming and outgoing calls are handled through interface with telephone lines provided by the local operating company (Telco). CPE is connected to these Telco lines at the point of interface, or the Demarcation Point. Telephone line problems on the Telco's side of the Demarcation Point are the responsibility of the Telco for repair; troubles on the customer's side of that point are the responsibility of the service company to provide for repair.

In general, the end user is not knowledgeable about where a technical malfunction is present; he only knows that his telephone system "doesn't work", and calls the service provider to take care of the problem. The service company dispatches a serviceman to the customer's site, whose first action is usually to take a "butt set" and test the Telco lines at the Demarcation Point. If the lines test good, then a problem exists in the CPE, and troubleshooting begins. If the Telco lines prove inoperative, the next action is to disconnect the CPE from the Telco lines, and test the lines again. Should the Telco lines remain inoperative, then the problem is definitively isolated to the Telco. When this occurs, the service company notifies the Telco of the problem; there is nothing which can be done at the site by the serviceman.

When a site visit results in isolation of trouble to the Telco, the result is a waste of technician time, resources, money, and overall time to repair from the customer's perspective. The service company can provide better and more efficient response if the trouble can be isolated to either side of the Demarcation Point prior to dispatch to the customer site. Key systems cannot provide this in any fashion; some intelligent PBX's provide for testing of specific trunk ports via access and service codes. However, even in the latter case, there is a certain amount of circular logic employed by using a PBX to test a particular trunk circuit. The result of such a test can have an absolute negative result: no trouble detected -- both the Telco line and the trunk card are good. When the test result is positive in detection of a problem, it is still unknown if the trouble lies in the Telco line or the trunk card itself -- the same trunk card is used to test the telephone line as normally accesses the line. True trouble isolation can effectively be provided only with a separate means of testing from normal operation.

1.3 Definitions

A brief description of types of telephone lines, signaling, addressing, and interfaces follows.

2-Wire Line: A total of two conducting wires are used for bidirectional voice (or data carrier) transmission. Audio signals in each direction are simultaneously present and are superimposed on one another. The impedance is typically 600-900 ohms. One twisted pair is used, and the transmission is balanced (the signal is the voltage difference between the two leads). Two-wire lines are contrasted with 4-wire lines, in which two twisted pairs are used, one for transmission in each direction.

Loop Start Signaling: In the idle state, the terminating equipment (telephone or telephone system) presents an open circuit to the two telephone leads, designated as Tip and Ring. The Telco places a DC voltage across the two leads, typically 52.5 volts. To originate a call, the terminating equipment closes the loop (goes off-hook) by presenting a low DC resistance between the Tip and Ring leads, permitting loop current to flow. The Telco Central Office (CO) detects the transition to loop current, and responds by returning dialtone, signifying that it is ready to receive addressing information (the user can now dial). When a call is placed to an idle loop start line, the Telco periodically superimposes an AC ringing voltage (typically 90 volts RMS) on the already present DC loop voltage across the Tip and Ring leads. The ringing voltage is nominally present for two seconds and off for four seconds. The AC ringing voltage directly rings the bell on electromechanical telephones, or is detected electronically by CPE. The ringing cycle persists until the terminating equipment answers the call by closing the loop (goes off-hook) in the same fashion as for originating a call. When the CO detects the presence of loop current, the ringing cycle is stopped, and a connection is established between the originating and terminating telephone lines. Once a call is established, the CPE maintains the loop closure for the duration of the call. In either case, the call is terminated by opening the loop (going on-hook). The CO detects the loss of loop current, and after a particular period of time (typically a fraction of a second for the originating line and 10-20 seconds for the terminating line), disconnects the call and places the telephone line into its idle state. Should the opposite end from which the call was ended (hung up) remain on-hook, a momentary loss of loop current will occur, signifying the end of the call; subsequently, the loop closure will be treated as a new originating call, returning dialtone.

Ground Start Signaling: In addition to the Tip and Ring leads, Earth Ground is used as a third lead for signaling purposes only. For transmission purposes, only the Tip and Ring leads are used. In the idle state, the terminating equipment presents an open circuit to all three telephone leads. The Telco places a DC voltage on the Ring lead with respect to Earth Ground, typically -52.5 volts. To originate a call, the terminating equipment connects the Ring lead to Earth Ground. The CO detects the presence of current through the Ring lead, and responds by grounding the Tip lead. From this point forward, the operation is identical to that of a loop start line. The CPE detects the return ground on the Tip lead and responds by closing the loop between Tip and Ring, and releasing the ground on the Ring lead. The CO responds by returning dialtone. When a call is placed to an idle ground start line, the Telco first grounds the Tip lead. From this point forward, the behavior is identical to that of a loop start line, i.e. it periodically superimposes an AC ringing voltage on the now present DC loop voltage across the Tip and Ring leads. The CPE can either detect the immediate ground on the Tip as an indication of an incoming call, or detect the ringing voltage as for loop start lines. The ringing cycle persists until the terminating equipment answers the call by closing the loop between Tip and Ring in the same fashion as for loop start lines. When the CO detects the presence of loop current, the ringing cycle is stopped, and a connection is established between the originating and terminating telephone lines. Once a call is established, the CPE maintains the loop closure for the duration of the call. In either case, the call is terminated by opening the loop (going on-hook). The CO detects the loss of loop current, and after a particular period of time (typically a fraction of a second for the originating line and 10-20 seconds for the terminating line), disconnects the call and places the telephone line into its idle state. Should the opposite end from which the call was ended (hung up) remain on-hook, a loss of loop current will occur, signifying the end of the call; in this way ground start lines provide positive Disconnect Supervision.

DTMF Dialing: Dual Tone Multi Frequency (DTMF) signifies a method of transmitting addressing information (dialed telephone number) in-band, i.e. within the audio channel bandwidth over telephone lines. DTMF signals consist of two superimposed audio tones, one from a low frequency group and one from a high frequency group. There are four frequencies used in each group, resulting in 16 possible pairs of tones. These pairs are assigned to the numeric digits 1-9 and 0, and the special digits *, #, A, B, C, and D. The latter four may be referred to as fourth column tones.

Pulse Dialing: Pulse dialing is a method of transmitting addressing information via opening (breaking) and closing (making) the DC loop in a telephone line. Electromechanical telephones with rotary dials directly generate contact closures when the dial is released, as the spring returns the dial to its resting position. This operation is also mirrored in electronic telephones or CPE trunk interfaces electronically. The numeric digits 1 through 9 and 0 are represented by 1 to 10 breaks in loop current, respectively, sent nominally at a rate of 10 breaks per second. Each break is brief, as too long of a break would be interpreted as an on-hook status, and cause a disconnection. Unlike DTMF addressing, pulse dialing is not an in-band signaling method, is not propagated through the telephone network, and cannot directly be used for end-to-end communication.

Hookflash: A 300 to 1000 millisecond on-hook condition while a call connection is in progress. This signaling mechanism is used to access certain Telco CO features such as call waiting and conference calling. Generally, a new dialtone is supplied as a response, to which DTMF or pulse commands are expected.

USOC RJ-11C Interface: The RJ-11 jack is a 6-pin socket which accepts a standard modular plug. A single 2-wire line is connected to the center two positions: pin 4 = Tip, 3 = Ring. No connection is made to pins 1, 2, 5, or 6.

USOC RJ-21X Interface: The RJ-21X miniature ribbon jack is a 50-pin connector which can be configured for up to 25 2-wire lines. Circuit #1 tip/ring appears on pins 26/1; circuit #2 tip/ring appears on pins 27/2; etc.

Customer Premises Equipment (CPE): This instruction manual refers to the customer's telephone system as CPE. This equipment can be key systems, PBX's, ACD's, or any other equipment which is connected to Telco provided lines.

Telco: local operating, or telephone company

CO: Telco Central Office switch

POTS: Plain Old Telephone Service, refers to 2-wire analog loop start telephone lines.

Demarcation Point: point of interface between the Telco line and CPE

1.4 General Line Maintenance with the RTS-2

The RTS-2 is designed to eliminate the needless site visits which otherwise occur when the problem encountered is trouble with the Telco line itself. It provides the equivalent of using a "butt set" at the Demarcation Point, without dispatching a serviceman to the customer's premises. The RTS-2 is accessed through any DTMF telephone in the public switched telephone network. In practice, when a customer complaint is received, the RTS-2 is used to remotely determine if there is a problem with the Telco line; if none is found, a service call is in order to repair the CPE.

The RTS-2 can be used with 2-wire loop or ground start Telco lines, and is connected via RJ-11C or RJ-21X jacks at the Demarcation Point. In normal operation, the RTS-2 provides actual contact closures connecting the Telco line through to the CPE, and the CPE operates without interference from the RTS-2. Should power be removed from the RTS-2, the through connection remains in place, permitting telephone system operation when power is lost (if the CPE is itself capable of operation without power).

Generally, line #1 is used to access the RTS-2 for remote testing. However, if it is desired to test line #1, then one of the other lines can be used for access. The RTS-2 monitors all enabled lines for ringing voltage. When a specified number of rings on any of the lines is reached, the RTS-2 splits that line from the CPE and prompts for a DTMF access code. After that code is entered, the user can command the RTS-2 to perform various operations used to test the other lines. In this manner, no additional maintenance lines are required to be able to perform testing. However, should it be desired, a separate maintenance line can be utilized; the advantage of doing so is that if used exclusively for this purpose, a small number of rings can be used to secure access. The number of rings required for access is separately programmable for line #1 and all other lines to facilitate this usage. Additionally, each line can be inhibited individually from answering.

Once the RTS-2 is accessed, the following operations can be performed on the Telco lines connected to it: seizing the line, to test for presence of loop current and reception of dialtone; DTMF and pulse dialing to test for the ability to originate a call; and listening for an incoming ring to test for the presence of ringing voltage. If the RTS-2 is installed in the bridged configuration instead of splitting the Telco line from the CPE, calls in progress from the CPE can be monitored as well (without the RTS-2 taking the line off-hook). A typical test session for a questionable line is as follows:

In this way, proper operation of the suspected Telco line can be tested for both incoming and outgoing calls. To complete a session, a command can be issued to release the access line, or simply hanging up automatically does the same.

1.5 Security Features

A Test Code is used to access the Test Mode to perform any of the test functions. A separate Program Code is used to access the Program Mode, which permits system parameters to be modified. The Test and Program Codes may be up to 12 digits long; a correct code must be successfully entered within a specified Access Time. The maximum time permitted for a testing session can be specified: if this is reached, the RTS-2 forcefully aborts the session. An InActivity time can be specified: if this time elapses without any DTMF digits received, the RTS-2 forcefully aborts the session.

The RTS-2 keeps track of how many times the unit answers incoming calls when attempts are made to gain access; unsuccessful access attempts; successful Test Mode accesses; successful Program Mode accesses; and the cumulative amount of time the unit has been actively used. All information stored in the RTS-2 is contained in nonvolatile EEPROM, and is retained after loss of power.

Logging

An RS-232 logging port is provided to monitor RTS-2 usage. This DB-9 jack can be attached to a computer, terminal, printer, or modem. The attached device's serial port must be configured for 2400 bps, eight data bits, no parity, and appear as Data Terminating Equipment (DTE). If the device appears as Data Communications Equipment (DCE), a null modem adapter should be used. IMPORTANT: if the RTS-2 is powered from a DC power source, then either that DC power supply, or the device attached to the logging port, must be isolated from ground.

No secret codes are transmitted out the logging port. The logging syntax for reported activity is as follows:     

R inline     Ring
S inline     Stopped ringing
A inline     Answered
F            Failure to receive Test or Program Code
T            Test Code entered
P            Program Code entered
H            Hangup (access line)
[2][3][4] 00 05 callback command
1 outline    1 seize line command, call forward, line ID
2 outline    2 DTMF dial fast command
3 outline    3 DTMF dial slow command
4 outline    4 pulse dial command
M outline    Monitor line (81 command)
F            HookFlash
D            Disconnect (exit from 1, 2, 3, 4, 81 commands)
W FF         initialize parameters (90173 command)
W FE         initialize counts (90249 command)
W F6         Write new Test Code (91 command)
W FD         Write new Program Code (92 command)
W hex        Write parameter (93 command), hex = 00-62 hexadecimal for decimal 00-98

Each of the above codes are followed by <cr><lf>

inline, outline codes:

The 05, 2, 3, and 4 commands have an additional line appended indicating the dialed number of the form:

1.6 Multiple Modules

The RTS-2 can handle up to eight Telco lines. Should a single access number be desired to permit dialing out on more than seven lines, the units can be chained together. One incoming Telco access line can be connected to line #1 on a Master unit, and the remaining seven lines used to directly connect to line #1 of seven additional Slave RTS-2 units. In this fashion, one access line can connect to up to 49 telephone lines in a two layer hierarchy. The slave devices can be programmed to automatically enter Test Mode when selected by the Master. An alternate exit command set can be used for either the Master or Slave units, so that a call can be broken down sequentially. See Chapter 4.

1.7 Indicator Lamps

The location of the indicator lamps is shown in section 1.10.

Ring Indicator: A red LED, labeled 1-8 for the line number, pulses when that line receives ring voltage. These are the eight left-most positions depicted for U13.

Off-hook Indicator: A green LED, labeled 1-8 for the line number, illuminates when the Telco line is off-hook for answering an incoming call, or an outgoing call is made. If configured for the ground start option, Out 8 indicates that the outgoing line is presently grounded. If configured for line monitoring, Out 7 indicates that monitoring on the outgoing line is in progress. These are the eight right-most positions depicted for U14.

Status Indicator: A green LED (labeled ST and occupying the left-most position of U14) shows the current status of the RTS-2 as follows:

Idle: blinks once every 640 milliseconds at a 1/16 duty cycle when the device is waiting for an incoming call.

Access: blinks once every 640 milliseconds at a 50% duty cycle when an incoming call has been answered, and waiting to receive a Test or Program Code.

Test Mode: blinks once every 320 milliseconds at a 50% duty cycle while in Test Mode and waiting for a command.

Program Mode: blinks once every 160 milliseconds at a 50% duty cycle while in Program Mode and waiting for a command.

Line in Use: off while the 1, 2, 3, 4, 05, or 81 commands are in progress.

Line 1 Indicator: A red LED (labeled 1, the right-most position depicted for U13) illuminates when line #1 draws loop current (incoming or outgoing usage).

Lines 2+ Indicator: A red LED (labeled 2+, the second from the right-most position depicted for U13) illuminates when one of lines #2 through #8 draws loop current (incoming or outgoing usage).

Receive Character Indicator: A green LED (labeled RX, the second from the left-most position depicted for U14) illuminates when a character is received from the serial RS-232 port. Not used.

1.8 Jumper Configuration

Shorting clips are used at the left edge of the board to configure certain options. When changing the mode of operation, the old clips should be removed from the previous setting before the new positions are filled.

Telephone Instrument or Telco Line

Line #1 can be configured for connection to a telephone (with equivalent DC resistance of 300 ohms or less) instead of a Telco line. This is useful for initial programming, and is necessary for device access should the Program Code be lost. Slave RTS-2's must be configured in this way when multiple devices are interconnected. The RTS-2 generates talk battery in this configuration. A Telco line must not be attached to line #1 when this setting is selected.

jumpers

After changing this setting, the telephone must be placed off-hook, or the telephone line must be rung for updating of the internal parameter (bit value 128 of parameter 03, section 3.8.2).

Line Monitor or Line #7 Capability

Either the Monitor Line command (81, section 2.10) can be made available, or the use of line #7 can be permitted. If the Monitor Line command availability is chosen, line #7 must be left unconnected.

jumpers

Parameter 03 must be reprogrammed after changing this setting (bit value 8, section 3.8.2).

Ground Start Lines or Line #8 Capability

Either ground start lines, or the use of line #8 can be selected. If the ground start option is chosen, line #8 must be left unconnected; the remaining lines can be connected to loop or ground start Telco lines. If line #8 capability is selected, only loop start lines may be used for outgoing test calls.

jumpers

Parameter 03 must be reprogrammed after changing this setting (bit value 4, section 3.8.2).

DTMF Receiver Sensitivity

The sensitivity of the internal DTMF receiver can be altered with jumper W2. Settings of 0 dB (default, no jumper), +6 dB, or -6 dB are available. The top cover of the RTS-2 must be removed for access to this jumper.

1.9 Mounting Options

Several board and case arrangements are available. The ears are attached to the side of the case with self-tapping screws, and can be placed into alternate configurations by the user.

RJ-11 Wall Mount

photo

The unit is mounted with four screws to an equipment board. An area 13 inches wide and 8 inches high is used; the box protrudes 2 inches from the wall. Up to eight RJ-11 modular cords for connection to Telco lines, up to eight RJ-11 modular cords for optional connection to CPE through-connected equipment, the power cord, and an optional RS-232 cable all attach at the bottom of the RTS-2.

RJ-21 Wall Mount

photo

The unit is mounted with four screws to an equipment board. An area 14 inches wide and 8 inches high is used; the box protrudes 1 inches from the wall. A single ribbon cable terminated in a 50-pin male connector for connection to Telco lines and optional connection to CPE through-connected equipment, the power cord, and an optional RS-232 cable all attach at the bottom of the RTS-2. The 50-pin connector is generally plugged into a 66 type block for cross connect wiring to Telco lines and CPE.

photo

The side mounting ears can be attached with the long portion along the side of the unit; in which case the board space used is the same as for the RJ-11 wall mount option. In this case, the ears may be turned towards the inside of the unit, reducing the width used to 10 inches. In either case, room is provided between the wall and the bottom plate to pass cables.

RJ-11 Desktop

photo

The side mounting ears are turned to point towards the interior of the unit, and rubber feet attached to the bottom of the ears. The dimensions are 10 inches wide, 8 inches deep, and 2 inches high. Up to eight RJ-11 modular cords for connection to Telco lines, up to eight RJ-11 modular cords for optional connection to CPE through-connected equipment, the power cord, and an optional RS-232 cable all attach at the front of the RTS-2.

photo

The RJ-11 daughterboard can be placed beneath the top edge of the main board instead of the bottom edge; and the bottom plate reversed to match. In this configuration, the RJ-11 modular cords connect to the opposite edge from the RS-232 cable and power cord, permitting the phone cables to be placed at the back of the desk.

RJ-21 Desktop

photo

The side mounting ears are turned to point towards the interior of the unit, and rubber feet attached to the bottom of the ears. Alternatively, the ears may be removed entirely and rubber feet attached to the bottom case. The dimensions are 10 inches wide, 8 inches deep, and 1 inches high. A single ribbon cable terminated in a 50-pin male connector for connection to Telco lines and optional connection to CPE through-connected equipment, the power cord, and an optional RS-232 cable all attach at the front of the RTS-2. The 50-pin connector is generally plugged into a 66 type block for cross connect wiring to Telco lines and CPE.

1.10 Hookup

Jacks

Either J1, J2, or J3 is used to provide power to the unit. Only one of these connectors should be used. J3 accepts a 9 volt AC adapter output (9 to 18 volts AC is usable). DC power from 24 to 52 volts (or AC power from 18 to 36 volts) is connected to J2 pins 1 and 2 (Molex housing 22-01-3037, pins 08-50-0114), or to the "P" pins (the two to the right) on terminal block J1. Polarity is irrelevant. The J2 pinouts are the same as shown for J1 (left is Earth Ground pin, two right pins are power). The terminal block screws are loosened with a small flat blade screwdriver parallel to the board; wires are inserted into the top of the terminal block, vertical to the board; and the terminal block screws tightened to secure the connection. Six watts should be allocated for the unit; however, from a 52 volt DC power source, the power drain in the idle state is one watt.

An optional logging device may be attached to the DB-9 jack J4. See section 1.5, logging, for device configuration.

The headers J6 Line, and J7 Thru, are used in the RJ-21X configuration. With the supplied cable attached to these two headers, RJ-21X circuit pairs 1-8 connect to Telco lines 1-8, and RJ-21X circuit pairs 9-16 optionally connect to the through-connected equipment (CPE) for lines 1-8. Other configurations can be defined by various arrangements of cable connections to J6 and J7 for multiple device application. The RTS-2 provides a straight connection between the line and equipment ports for lines which are not in use. The CPE is disconnected from the Telco line when the RTS-2 answers or seizes a line.

In the RJ-11 configuration, a daughterboard is mounted beneath the main board. The left array of eight jacks is for connection to the Telco line, as for J6 above. The right array of eight jacks is for optional connection to CPE, as for J7 above.

Connections

2. Tests

This chapter describes how to access the Test Mode and operate with the factory default settings. Line test operations are detailed. Command instructions are given for systems without Multiple Modules. If more than eight lines are required, consult chapter 4. To alter the factory default settings, see chapter 3.

2.1 Accessing Test Mode

Connect the Remote Test Set as described in section 1.10, and apply power. Dial one of the telephone lines connected to the unit with a DTMF equipped telephone. The Ring Indicator illuminates as the incoming line receives ringing voltage. Do not answer the line with the CPE. After the first ring the RTS-2 answers the call. The Off-hook Indicator illuminates, the Ring Indicator ceases flashing, and the Status Indicator changes state.

If the RTS-2 is jumpered for a Telephone Instrument on line #1 (section 1.8), attach a telephone to that port and take it off-hook instead of dialing into the unit.

The Access Prompt, a 948 Hz single tone followed by a DTMF D, is heard in the calling telephone. No further audible responses are made until successful entry into Test Mode is achieved. Using the DTMF keypad, enter the Test Code: 1984. If an error is made while entering the Test Code, enter the Abort Digit: *. Reenter the Test Code. A maximum of 15 seconds is permitted to properly enter the Test Code once the Access Prompt is sent. If this time is exceeded, the attempt is terminated, and the incoming line is released.

After reception of the correct Test Code, the Status Indicator changes and the Test Prompt is issued. This is a five tone sequence, Low-Medium-High-Medium-Low. From the Test Prompt, any of the Test Commands described in the remainder of this chapter can be entered. While entering any Test Command, mistakes can be corrected by entering the Abort Digit (*); the Test Prompt is not reissued, and the command sequence should be restarted in its entirety. Invalid commands are flagged with the Error Alert, which is a six tone sequence, High-Low-High-Low-High-Low. In such cases, the Test Prompt is reissued after the Error Alert.

In all cases, the user must wait for the completion of any response tones prior to proceeding with further digit entry. After completion of each Test Command, the Test Prompt is reissued, and the RTS-2 is ready for the next Test Command.

A maximum of one hour is permitted per session. This time commences upon the initial answering of the line, and is not reset by any operation other than release of the incoming line. Additionally, a maximum of 5 minutes between DTMF digits entered by the user is permitted. If the session maximum is reached (Overall Timer), or the InActivity timeout elapses, the RTS-2 sends a long DTMF D and automatically releases the line, forcibly terminating the session.

2.2 Seizing a Line

If the RTS-2 is accessed on line #1, lines #2-6 can be seized. If the RTS-2 is accessed on a line other than #1, only line #1 can be seized. To do so, from the Test Prompt, enter the digit 1, followed by a single digit specifying the outgoing line, from 1 to 6. The Acknowledgement Tone is sent: Medium-High.

The selected line is split from the CPE, and the Off-hook Indicator lamp illuminates for that line. A loop closure is placed between the Tip and Ring leads, and the Status Indicator extinguishes. An audio path is established between the access and the seized lines, and can be used for any desired purpose. Loop current is not required from the selected line. If the selected line was previously idle, and the line is loop start and functional, dialtone is drawn. Ground start lines can be accessed with the 2, 3, and 4 commands, or the programming can be altered to support them with the 1 command (section 3.8.10). Dialing may be attempted directly from the calling telephone via DTMF tones (if the selected line is equipped for DTMF access). Alternatively, the dialing commands detailed in subsequent sections can be used. This is mandatory if the selected line is equipped only for pulse dialing, and may be necessary for DTMF addressing if line losses reduce the signal amplitude below the required input threshold.

If an incoming call rings the selected line prior to seizure, the call is simply answered, and a talk path is established. Dialtone is not drawn. If a call is in progress on the selected line through the CPE prior to split and seizure, the call may be transferred to the RTS-2.

To conclude the selected line seizure operation, enter ### to return to the Test Prompt.

2.3 Standard DTMF Dialing

If the RTS-2 is accessed on line #1, lines #2-6 can be selected for dialing. If the RTS-2 is accessed on a line other than #1, only line #1 can be selected for dialing. To do so, from the Test Prompt, enter the digit 2, followed by a single digit specifying the line, from 1 to 6. Enter all DTMF digits desired to be sent to dial a telephone number after line seizure. All digits with the exception of # (which ends the command entry) and * (which aborts the command) can be used. A maximum of 59 digits is permitted. After all such digits, enter #. The Acknowledgement Tone is sent.

The selected line is split from the CPE, and the Off-hook Indicator lamp illuminates for that line. A loop closure is placed between the Tip and Ring leads. The line is checked for presence of loop current. If none is detected (either a ground start or a faulty line), the Ring lead is grounded for one second. Loop current is again tested; if no current is present at this time, the Error Alert is sent, and the operation is aborted.

If loop current is present, the line is checked for presence of dialtone. If no dialtone is received within five seconds, the Error Alert is sent, and the operation is aborted.

After reception of dialtone, the specified telephone number is then redialed with DTMF digits. The dialing is done at the standard rate of ten digits per second. Each DTMF tone pair is transmitted for 50 milliseconds followed by a silent interval of 50 milliseconds.

After completion of dialing, the Status Indicator extinguishes, the selected line remains seized, and the audio path to and from that line can be used for any desired purpose.

To conclude the Standard DTMF Dialing operation, enter ### to return to the Test Prompt.

2.4 Slow DTMF Dialing

Properly functioning Telco lines are able to accurately receive DTMF signals at the rate of ten digits per second. In the event that Central Offices cannot handle this standard rate, the RTS-2 provides for a slower dialing rate.

If the RTS-2 is accessed on line #1, lines #2-6 can be selected for dialing. If the RTS-2 is accessed on a line other than #1, only line #1 can be selected for dialing. To do so, from the Test Prompt, enter the digit 3, followed by a single digit specifying the line, from 1 to 6. Enter all DTMF digits desired to be sent to dial a telephone number after line seizure. All digits with the exception of # (which ends the command entry) and * (which aborts the command) can be used. A maximum of 59 digits is permitted. After all such digits, enter #. The Acknowledgement Tone is sent.

The selected line is split from the CPE, and the Off-hook Indicator lamp illuminates for that line. A loop closure is placed between the Tip and Ring leads. The line is checked for presence of loop current. If none is detected (either a ground start or a faulty line), the Ring lead is grounded for one second. Loop current is again tested; if no current is present at this time, the Error Alert is sent, and the operation is aborted.

If loop current is present, the line is checked for presence of dialtone. If no dialtone is received within five seconds, the Error Alert is sent, and the operation is aborted.

After reception of dialtone, the specified telephone number is then redialed with DTMF digits. The dialing is done at the slow rate of five digits per second. Each DTMF tone pair is transmitted for 100 milliseconds followed by a silent interval of 100 milliseconds.

After completion of dialing, the Status Indicator extinguishes, the selected line remains seized, and the audio path to and from that line can be used for any desired purpose.

To conclude the Slow DTMF Dialing operation, enter ### to return to the Test Prompt.

2.5 Pulse Dialing

If the RTS-2 is accessed on line #1, lines #2-6 can be selected for dialing. If the RTS-2 is accessed on a line other than #1, only line #1 can be selected for dialing. To do so, from the Test Prompt, enter the digit 4, followed by a single digit specifying the line, from 1 to 6. Enter in DTMF all numeric digits desired to be sent to rotary pulse dial a telephone number after line seizure. A maximum of 59 digits is permitted. After all such digits, enter #. The Acknowledgement Tone is sent.

The selected line is split from the CPE, and the Off-hook Indicator lamp illuminates for that line. A loop closure is placed between the Tip and Ring leads. The line is checked for presence of loop current. If none is detected (either a ground start or a faulty line), the Ring lead is grounded for one second. Loop current is again tested; if no current is present at this time, the Error Alert is sent, and the operation is aborted.

If loop current is present, the line is checked for presence of dialtone. If no dialtone is received within five seconds, the Error Alert is sent, and the operation is aborted.

After reception of dialtone, the specified telephone number is then redialed with standard pulse signaling, by opening and closing the loop. The dialing is done at the standard rate of ten pulses per second, with an interdigital time of 700 milliseconds.

After completion of dialing, the Status Indicator extinguishes, the selected line remains seized, and the audio path to and from that line can be used for any desired purpose.

To conclude the Pulse Dialing operation, enter ### to return to the Test Prompt.

2.6 Call In-Progress Commands

Three 3-digit commands are available while a call is in progress via the 1, 2, 3, and 4 commands. All other DTMF sequences are ignored by the RTS-2 while these commands are in progress to permit direct transmission through the system. The second digit must be sent within 2.5 seconds of the first digit, and the third digit must be sent within 2.5 seconds of the second. If either interval is exceeded, the sequence must start over. If it is necessary to actually transmit these very same digit sequences through the test set, a several second pause is required between each digit.

Command Exit

### exits the command in progress. If the alternate call in-progress command option (041, section 2.15) is in effect, *## replaces this code. This is also used by the Monitor Line (81, section 2.10) command.

HookFlash

##0 generates a hookflash on the outgoing line. The loop is broken for 650 milliseconds. The call remains in progress. This can be used to exercise conference calling, call waiting, and other Central Office features. If the alternate call in-progress command option (041, section 2.15) is in effect, *#0 replaces this code.

Level Measurement

##8 [*#8] measures and stores the signal level on the outgoing line. This value is read back with the 83 command (section 2.11). This can also be performed while the Monitor Line (81, section 2.10) command is in progress.

##1 [*#1]: transmits a 10 second 1000 Hz tone signal at a 0 dBm level to the outgoing line (v1.4 and later). Section 2.9's 71 sends it to the incoming line.

2.7 Listening for Ringing

Any line can be selected to listen for the presence of ringing voltage. When listening for ringing, the selected line is not affected in any way. To do so, from the Test Prompt, enter the digit 5, followed by a single digit specifying the line, from 1 to 6.

A brief tone burst is sent to indicate command acceptance. While ringing voltage is present, a 948 Hz single tone is sent. The tone appears and disappears as ringing voltage appears and disappears. During this operation, the selected line is neither split nor seized, and an audio path to that line is not established.

To conclude the Listening for Ringing operation, enter # to return to the Test Prompt. Or (firmware v1.3 and later), answer the call with * if the line is suitable for line seizure as in section 2.3.

2.8 Reading Information

Certain information can be read from the RTS-2 by request. Retrieved information is communicated with tone beeps. A sequence of beeps is sent for each information digit. For values of 1 to 9, that number of beeps is sent; for a value of 0, a single long beep is sent. Pauses are present between each digit of the extracted information.

Unit Identification

A six digit unit identification number can be stored (section 3.8.1). Enter the command 60 to read it back.

Line Identification

To determine which incoming line has been accessed (when incoming hunt groups are utilized), enter the command 61. A single digit from 1 to 8 is communicated identifying the incoming line number.

Number of Test Mode Accesses

To determine the number of times the Test Mode has successfully been accessed, enter the command 62. Three digits from 0 to 9 are communicated, forming a number from 000 to 999 for the cumulative number of times that the Test Code has been received since reset with the Clear All Counts command (section 3.3). The hundreds, tens, and units digits are sent in order.

If the Short Counts bit is not set (section 3.8.2), then six digits are sent instead of the three least significant digits, forming a number from 000000 to 999999.

Number of Program Mode Accesses

To determine the number of times the Program Mode has successfully been accessed, enter the command 63. Three digits from 0 to 9 are communicated, forming a number from 000 to 999 for the cumulative number of times that the Program Code has been received since reset with the Clear All Counts command (section 3.3). The hundreds, tens, and units digits are sent in order.

If the Short Counts bit is not set (section 3.8.2), then six digits are sent instead of the three least significant digits, forming a number from 000000 to 999999.

Number of Access Failures

To determine the number of times that a timeout has occurred while attempting to enter the Test or Program Codes (after receiving the Access Prompt), enter the command 64. Three digits from 0 to 9 are communicated, forming a number from 000 to 999 for the cumulative number of times that the Access Timeout has aborted access attempts since reset with the Clear All Counts command (section 3.3). The hundreds, tens, and units digits are sent in order.

If the Short Counts bit is not set (section 3.8.2), then six digits are sent instead of the three least significant digits, forming a number from 000000 to 999999.

Number of Access Answers

To determine the number of times the RTS-2 has answered incoming calls, expecting to receive the Test or Program Codes, or to activate the other programmable functions, enter the command 65. Three digits from 0 to 9 are communicated, forming a number from 000 to 999 for the cumulative number of times that lines have been answered since reset with the Clear All Counts command (section 3.3). The hundreds, tens, and units digits are sent in order.

If the Short Counts bit is not set (section 3.8.2), then six digits are sent instead of the three least significant digits, forming a number from 000000 to 999999.

Active Minutes

The RTS-2 maintains a timer which keeps track of active device usage. This includes any activity other than the idle state. To determine the current cumulative number of active minutes, enter the command 66. Three digits from 0 to 9 are communicated, forming a number from 000 to 999 for the number of minutes that the device has been active since reset with the Clear All Counts command (section 3.3). The hundreds, tens, and units digits are sent in order.

If the Short Counts bit is not set (section 3.8.2), then six digits are sent instead of the three least significant digits, forming a number from 000000 to 999999.

Firmware Version

To determine the RTS-2 firmware version, enter the command 67. A two digit value from 00 to 99 is communicated, identifying the firmware release as version number 0.0 through 9.9.

Check Processor ROM

To verify the integrity of the internal control program store, enter the command 68. The two digit value 00 is communicated verifying the firmware checksum. If a nonzero value is reported, an Error Alert results.

2.9 Test Tones

Four test tones can be generated. The command 71 transmits a 1000 Hz tone; the command 73 transmits a 3000 Hz tone; and the command 74 transmits a 400 Hz tone. Each of these tones is sent at a 0 dBm level (assuming a 600 ohm resistive termination). The command 72 transmits a tone at a preprogrammed frequency and level (section 3.8.7).

Each of these tones is transmitted for ten second durations with intervening one second silent periods. Enter # to return to the Test Prompt. It may be necessary to wait for the silent interval to do so. For v1.4 and later, if the alternate call in-progress command option (041, section 2.15) is in effect, exit with *.

2.10 Monitoring Lines

If so jumpered and configured (sections 1.8, 3.8.2), the RTS-2 can monitor lines without drawing loop current. In this mode, an audio path is established from the selected line towards the access line; there is no audio path from the access line towards the selected line. This feature is available for lines #2-6 (plus line #8 if ground start lines are not jumpered and configured, sections 1.8, 3.8.2) when the device is accessed from line #1. To monitor a line, from the Test Prompt, enter the command 81, followed by a single digit specifying the line. The Acknowledgement Tone is sent: Medium-High.

To conclude the Line Monitor operation, enter ### to return to the Test Prompt. See sections 2.6 and 2.11 for other options.

2.11 Level Measurement

The RTS-2 can measure the levels of continuous tones. To store the level of a signal coming from an outgoing line while the 1, 2, 3, 4, and 81 commands are in progress, enter ##8 (alternate *#8, section 2.6) while those commands are in progress. To store the level of a signal coming from the access line while in Test Mode, enter 82. The signal level is measured 2.5 seconds after release of the final DTMF digit (8 or 2) for both cases. This permits a tone generator to be switched on after the command is given.

To read back the most recently stored level measurement, from Test Mode enter 83. Two digits are sent, each in the range 0-15 via beeps (section 2.8). The decimal value of the recorded measurement is the first value times 16, added to the second digit, resulting in a final value in the range of 0-255. The stored value is maintained until a new measurement is made, or the unit is powered down. Playing back a value after powerup and before storing a value yields meaningless information.

The reported values may be used as relative (nonlinear) measurements. For single-tone sine wave signals, the following may be used as a guide:

See the RTS-2 FAQ's page on the website for a spreadsheet of values and a downloadable conversion program.

Graph

2.12 DTMF Digit Playback

To test the reception of DTMF signals, from Test Mode enter 84. Any of the DTMF digits other than # may be sent individually; the RTS-2 responds via beeps indicating the DTMF value received. The digits *, A, B, C, D produce values 11, 13, 14, 15, 10, respectively. Enter # to return to the Test Prompt.

2.13 Exiting Test and Program Modes

Hanging up the calling telephone causes a loss of loop current (momentary for loop start lines) at the incoming RTS-2 line if the Telco supports disconnect supervision. Reception of this disconnect signal automatically exits Test or Program Mode, and releases the incoming line.

To force release of the incoming line without depending upon detection of the disconnect signal, enter the Hangup command 00. The line is immediately restored to the CPE after a long DTMF D is transmitted.

To exit Test or Program Mode without relinquishing the incoming line, enter the New Access command 01. This performs the equivalent of hanging up and dialing in again. The Access Prompt is issued, and the Test or Program Codes can be entered. The purpose is to be able to quickly change between Test and Program Modes. The Overall Timeout (section 3.8.6) is not reset by this action.

2.14 Set a Command Timeout

A timeout may be enforced for the 1, 2, 3, 4, 71-74, and 81 commands. To override the default setting (section 3.8.6) for the current session, from Test Mode enter 02 followed by two digits in the range 00-99 seconds. A value of 00 disables the command timeout function. If this is set to a nonzero value, then a command timeout of 1-99 seconds is put into place for the affected commands; after the specified maximum time is reached without exiting, the unit automatically exits with an Error Alert, and return to the Test Prompt.

For example, if a milliwatt test number is accessed which might prevent reception of the ### exit command, if prior to dialing the test number, the 0215 command were issued, then 15 seconds after the number has been dialed, the RTS-2 automatically aborts the test call. This is generally not necessary, but is a useful safety valve.

2.15 Call In-Progress Command Set

The default call in-progress command set (section 3.8.2) can be overridden for the test session. From the Test Prompt enter 040 to force the standard call in-progress command set (###, ##0, ##8, ##1); enter 041 to force the alternate call in-progress command set (*##, *#0, *#8, *#1). See section 2.6. This is useful if one RTS-2 is used to access a second RTS-2.

2.16 Callback

The RTS-2 can be instructed to hang up and call the operator back in order to test an incoming line, or to reverse toll charges. From the Test Prompt, enter 052, the callback telephone number digits, followed by # to dial back at the standard DTMF rate. Enter 053, the callback telephone number digits, followed by # to dial back at the slow DTMF rate. Enter 054, the callback telephone number digits, followed by # to dial back with pulse signaling. For each of these commands, the RTS-2 sends a tone burst acknowledgement, hangs up the access line, pauses 30 seconds, and dials the requested number. (To change the pause time, see section 3.8.6.) After answering the incoming call, enter any DTMF digit. This must be done within the number of seconds determined by the currently active Command Timeout (section 2.14). If it is currently disabled, a 60 second value is used. The Access Prompt is produced, and it is necessary to enter the Test or Program Code as for any new access.

2.17 Machine Response Mode

Automatic equipment such as ARONTS can be used to access and control the RTS-2. Calling equipment can monitor for DTMF D (section 2.1) after dialing the access number prior to sending the Test or Program Code. To place the unit into machine (DTMF) response mode, precede the Test or Program Code with #. In this mode, the prompts intended for human interpretation are replaced with DTMF signals:

The Error Alert is not followed by a Test or Program Prompt when in DTMF response mode. Also, the Read Information (60-68) responses generate the DTMF digits 1-9, and D, which represents value 0.

3. Customization

This chapter describes how to access Program Mode and change the factory default settings. All settings are saved in EEPROM memory which provides nonvolatile storage.

3.1 Accessing Program Mode

Follow the procedure of section 2.1 for accessing Test Mode, but instead of entering the Test Code, use the Program Code: 2001. After reception of the correct Program Code, the Status Indicator changes and the Program Prompt is issued. This is the same five tone sequence as the Test Prompt, Low-Medium-High-Medium-Low, except that the center tone (High) is longer than the others. From the Program Prompt, any of the Test Commands described in chapter 2, or the Program Commands described in the remainder of this chapter, can be entered. As in Test Mode, entering * at any time prior to completing a command sequence aborts the entry. Program Mode is exited as described in section 2.13.

3.2 Initialize all Parameters

To set all parameters to the factory default values, enter 90173. This has the following effect:

3.3 Clear All Counts

To zero all peg counts, enter 90249. This affects the 62, 63, 64, 65, and 66 commands by clearing these five values:

3.4 Changing the Test Code

The Test Code is a sequence of numeric or fourth column digits with length of one to twelve digits. To change the Test Code, enter 91, followed by the desired Test Code (digits 1 through 9, 0, A, B, C, and D), #, repeat the desired Test Code, terminated with #. If the two specifications for the Test Code do not match, the Error Alert is sent, and the Test Code is not altered.

3.5 Changing the Program Code

The Program Code is a sequence of numeric or fourth column digits with length of one to twelve digits. To change the Program Code, enter 92, followed by the desired Program Code (digits 1 through 9, 0, A, B, C, and D), #, repeat the desired Program Code, terminated with #. If the two specifications for the Program Code do not match, the Error Alert is sent, and the Program Code is not altered.

3.6 Changing Parameters

Operating parameters are numbered 00-98. Each of these parameters contains a value in the range 000-255 decimal. Parameters are changed one at a time. To write a new value into a single parameter: enter 93; the two-digit parameter number; followed by the three-digit parameter value. It is necessary to always enter two digits for the parameter number, and three digits for the parameter value.

3.7 Reading Parameters

Operating parameters are numbered 00-98. Each of these parameters contains a value in the range 000-255 decimal, or equivalently, 00-FF in hexadecimal form. The current values of the parameters can be read one at a time. To read the value of a single parameter, enter 94 and the two-digit parameter number. It is necessary to always enter two digits for the parameter number. The RTS-2 responds with a hexadecimal form of the parameter's value: two digits are sent via beeps, each representing a digit with value of 0-15. For digit values of 1-15, that many beeps is transmitted; for a digit value of 0, a single long tone is sent. The decimal value of the parameter is the first received digit multiplied by 16, added to the value of the second digit. For example, to determine the current setting for parameter 08, enter 9408; with the default setting, a sequence of 3 beeps followed by a sequence of 12 beeps is heard. Parameter 08's value is therefore (3 x 16) + 12 = 60. The corresponding programming instruction for that value is 9308060.

Hexadecimal notation uses the characters A, B, C, D, E, and F to represent decimal values of 10, 11, 12, 13, 14, and 15, respectively.

3.8 Parameter Definitions

Each of the parameter definitions provides: the parameter number (00-98 decimal); the default value in decimal (000-255); the default value in hexadecimal (00-FF); a description of the parameter; and an example. The decimal values are used to write, or set, the parameter (section 3.6); the hexadecimal values may be used to verify current programming (section 3.7).

3.8.1 Unit ID: parameters 00, 01, 02; default values 000, 000, 000 decimal, 00, 00, 00 hexadecimal, representing a unit ID of 000000. These three parameters each store two digits of a six-digit unit identification number (section 2.8). The values are stored in hexadecimal form. Example: to program the unit with an ID number of 123456, parameter 00 is set to 12 hexadecimal, or (1 x 16) + 2 = 018 decimal; parameter 01 is set to 34 hexadecimal, or (3 x 16) + 2 = 050 decimal; and parameter 02 is set to 56 hexadecimal, or (5 x 16) + 2 = 082 decimal. The commands are therefore 9300018, 9301050, and 9302082.

3.8.2 Bit Parameters: parameters 03 and 04 contain eight and four binary settings, respectively. Each of these values is independent. The overall decimal parameter value is the sum of all the bit values within the parameter.

Parameter 03

Telephone Instrument on line #1: bit value 128; default value 0. This setting must reflect the corresponding configuration jumper setting (section 1.8). A value of 128 indicates a Telephone Instrument is connected to line #1; a value of 0 indicates a Telco line is connected to line #1. This value is automatically updated whenever a ring signal is received on line #1, or a directly connected telephone is taken off-hook on line #1 in the idle state. It is therefore not necessary to manually program this bit value if, immediately after changing the jumper settings, a new call on line #1 is initiated by the appropriate means.

Short Counts: bit value 64; default value 64. A value of 64 causes the 62-66 commands (section 2.8) to supply the three least significant digits of the requested count; a value of 0 causes those commands to supply the complete six-digit count.

Autoreset: bit value 32; default value 32. A value of 32 causes the RTS-2 to automatically perform an internal reset every hour if no incoming calls have been received. A value of 0 inhibits this operation (there is no advantage in doing so).

Watchdog Timer: bit value 16; default value 16. A value of 16 activates an internal watchdog timer. A value of 0 inhibits this operation (there is no advantage in doing so).

Line Monitor Capability: bit value 8; default value 8. This setting must reflect the corresponding configuration jumper setting (section 1.8). A value of 8 indicates the Monitor Line command (81, section 2.10) is available, and that line #7 is not to be used; a value of 0 indicates the Monitor Line command is not available, but a Telco line can be connected to line #7.

Ground Start Capability: bit value 4; default value 4. This setting must reflect the corresponding configuration jumper setting (section 1.8). A value of 4 indicates that ground start lines can be used, and that line #8 is not to be used; a value of 0 indicates that only loop start lines can be used, but a Telco line can be connected to line #8.

Logging Port: bit value 2; default value 2. A value of 2 activates logging activity (section 1.5); a value of 0 disables the RS-232 output.

Ring Trip: bit value 1; default value 0. A value of 1 causes a line to be answered during the presence of ring voltage; a value of 0 causes a line to be answered after the Telco ring voltage has paused (in between rings). A setting of 0 is preferred.

The parameter 03 default setting is 0 + 64 + 32 + 16 + 8 + 4 + 2 + 0 = 126 decimal, 7E hexadecimal. The corresponding programming command is 9303126.

Parameter 04

Automatic Machine Response Mode Selection: bit value 8, default value 0. A value of 8 selects automatic Machine Response Mode entry (section 2.17). This has no effect unless the Automatic Test or Program Mode bit is 1.

Alternate Call In-Progress Commands: bit value 4, default value 0. A value of 4 sets the default call in-progress commands to the alternate set: *##, *#0, *#8, and *#1. A value of 0 sets the default call in-progress commands to the standard set: ###, ##0, ##8, and ##1 (section 2.6). The 040 and 041 commands (section 2.15) override this default setting during a command session.

Automatic Program/Test Mode Selection: bit value 2, default value 0. A value of 2 selects automatic Program Mode entry; a value of 0 selects automatic Test Mode entry. This bit has no effect unless the Automatic Test or Program Mode bit is 1.

Automatic Test or Program Mode: bit value 1, default value 0. A value of 1 causes calls answered on line #1 in the idle state to bypass collection of a Test or Program Code and go directly to one of those modes; the mode is selected by the Automatic Program/Test Mode Selection bit. A value of 0 inhibits this special operation and produces instead an Access Prompt. This automatic function is primarily used for slave units in the Multiple Configuration (chapter 4) in combination with a setting of Telephone Instrument on line #1.

The parameter 04 default setting is 0 + 0 + 0 + 0 = 000 decimal, 00 hexadecimal. The corresponding programming command is 9304000.

3.8.3 Disconnect Time: parameter 05; default value 003 decimal, 03 hexadecimal, representing a value of 30 milliseconds. The Disconnect Time can be set to a value from 1 to 255, representing a time from 10 to 2550 milliseconds. This is the time required for loss of loop current on the incoming line for acceptance by the RTS-2 as a disconnect signal from the Telco. It is recommended that this be set to 500 milliseconds if all lines are ground start; this provides for the greatest rejection of extraneous switching transients from the Central Office. For loop start lines, this must be set to a lower value than the break time generated by the Telco when the distant party hangs up. The lower the Disconnect Time is set, the more susceptible the RTS-2 is to extraneous transients on the line, such as call waiting loop current losses which sometimes occur in ESS offices. Example: to set the Disconnect Time to 60 milliseconds, enter 9305006.

3.8.4 Auto Answering: Several parameters control the conditions under which incoming calls are answered.

Ring On Detect Time

Parameter 06; default value 003 decimal, 03 hexadecimal, representing 300 milliseconds. This parameter sets the minimum amount of time ring voltage must be continuously present on any line for it to be considered the beginning of a new ring cycle. The programmed value is the number of tenth seconds required. This parameter is used to count the number of rings, and can be utilized for adjustment to unusual ring cadences. To restore the default setting, enter 9306003.

Ring Off Detect Time

Parameter 07; default value 003 decimal, 03 hexadecimal, representing 300 milliseconds. This parameter sets the minimum amount of time ring voltage must be continuously absent on any line for a ring cycle to be considered completed. The programmed value is the number of tenth seconds required. This parameter is used to count the number of rings, and can be utilized for adjustment to unusual ring cadences. To restore the default setting, enter 9307003.

Ring Loss Detect Time

Parameter 08; default value 060 decimal, 3C hexadecimal, representing 6.0 seconds. This parameter sets the maximum amount of time between successive rings for a ring cycle to be considered in progress. When ringing stops for this amount of time, the call is considered abandoned. The programmed value is the number of tenth seconds required. This parameter can be utilized for adjustment to unusual ring cadences. To restore the default setting, enter 9308060.

Number of Rings to Answer Line #1

Parameter 09; default value 001 decimal, 01 hexadecimal. This parameter sets the number of rings required before line #1 is answered, in the range of 1-255 rings. If line answering for line #1 is inhibited, this parameter has no effect. If line #1 is jumpered for a Telephone Instrument (section 1.8), this parameter has no effect. This parameter can be programmed for immediate answering for the case of no CPE, or for delayed answering to supply time for CPE to answer first. Example: to require 5 rings, enter 9309005.

Number of Rings to Answer Lines #2-8

Parameter 10; default value 001 decimal, 01 hexadecimal. This parameter sets the number of rings required before lines other than #1 are answered, in the range of 1-255 rings. If line answering for a line is inhibited, this parameter has no effect on that line. This parameter can be programmed for immediate answering for the case of no CPE, or for delayed answering to supply time for CPE to answer first. Example: to require 10 rings, enter 9310010.

Inhibiting Line Answering

Bit parameter 11; default value 063 decimal, 3F hexadecimal, enabling lines 1-6 and inhibiting lines 7 and 8. Each of the lines on the RTS-2 can be configured to enable or inhibit answering. This has effect for all line answer functions.

The parameter 11 value is the sum of the values for each of the eight lines. If Line Monitor capability is configured (sections 1.8, 3.8.2), answering on line #7 must be inhibited. If ground start capability is configured (sections 1.8, 3.8.2), answering on line #8 must be inhibited. If a Telephone Instrument is connected to line #1, this parameter has no effect on that line. Example: to enable answering only on lines #1 and #5, a setting of 0 + 0 + 0 + 16 + 0 + 0 + 0 + 1 = 17 is required; enter 9311017.

3.8.5 Line Answer Functions: if a line is configured to answer incoming rings, upon answering the RTS-2 performs one of four separate functions. Each line must be programmed for a single function only.

Line Identification

Bit parameter 12; default value 000 decimal, 00 hexadecimal, disabling the Line Identification function for all lines. This parameter's value is determined in the same fashion as Inhibiting Line Answering (parameter 11, section 3.8.4) to specify which lines are to execute the Line Identification function upon answer. It is also necessary to program the ID Dial String (section 3.8.9) if any line is selected for this function. The purpose of this function is to determine which of a set of lines (telephone numbers) has been selected by a telecommunications switch. For example, an 800 number may be configured to terminate to different carriers based upon point of origin, time of day, or statistical load balancing. The terminating number for each of the several carriers is programmed to land on a different RTS-2 line. Test calls then arrive at different RTS-2 lines based upon the sharing arrangement. Lines performing this function merely transmit a unique identifying DTMF sequence upon answer. In this fashion the call distribution can be cataloged. This function is also used to perform CO-based call forwarding by programming a hookflash and dialing instructions in the ID Dial String. See section 3.8.10.

Call Forwarding

Bit parameter 13; default value 000 decimal, 00 hexadecimal, disabling the Call Forwarding function for all lines. This parameter's value is determined in the same fashion as Inhibiting Line Answering (parameter 11, section 3.8.4) to specify which lines are to execute the Call Forwarding function upon answer. Line #1 is not available for this function. It is also necessary to program the Call Forwarding Dial String (section 3.8.9) if any line is selected for this function. The purpose of this function is to automatically forward calls arriving on lines #2-8 to another preprogrammed number by connecting the incoming line to line #1, and dialing out line #1. See section 3.8.10.

Responder

Bit parameter 14; default value 000 decimal, 00 hexadecimal, disabling the Responder function for all lines. This parameter's value is determined in the same fashion as Inhibiting Line Answering (parameter 11, section 3.8.4) to specify which lines are to execute the Responder function upon answer. The purpose of this function is to automatically provide a 1000 Hz @ 0 dBm test tone upon answer without any authorization or control digits required. The tone and sequencing is identical to the 71 command (section 2.9). If any line is selected for this function, it is also necessary to program:

Parameter 15: default value 004 decimal, 04 hexadecimal, setting Responder Cycles to 3. This parameter determines the number of 10-second tone bursts to generate prior to automatically hanging up the line. The programmed value is one greater than the desired number of cycles. ### (or *## if the alternate call in-progress commands are the default, section 3.8.2) can be used to abort prior to the completion of the programmed number of cycles.

Standard Access

If a line is not configured for the Line Identification, Call Forwarding, or Responder functions, and has Line Answering enabled, then it automatically provides an Access Prompt upon answer, and entry of the Test or Program Code is expected.

Line Answer Functions Example: to configure lines #1 and #2 for standard access; line #3 as a responder generating 2 tone bursts; lines #4 and #5 for Line Identification; and line #6 for Call Forwarding, enter 9312024; 9313032; 9314004; and 9315003.

3.8.6 Timing Values: various timing parameters can be customized according to particular requirements.

Access Time

Parameter 16; default value 015 decimal, 0F hexadecimal. The Access Time can be set to a value from 1 to 255 seconds. This is the maximum time permitted after the RTS-2 provides the Access Prompt, and either the Test or Program Code is correctly received. Example: to set the Access Time to 30 seconds, enter 9316030.

Overall Time

Parameter 17; default value 060 decimal, 3C hexadecimal. The Overall Time can be set to a value from 0 to 255 minutes. This is the maximum time permitted per session, beginning when the RTS-2 answers an incoming line and provides the Access Prompt. A value of 0 disables this timer. A timeout cancels the session and hangs up. Example: to set the Overall Time to 20 minutes, enter 9317020.

InActivity Time

Parameter 18; default value 005 decimal, 05 hexadecimal. The InActivity Time can be set to a value from 0 to 255 minutes. This is the maximum time permitted without entering a DTMF digit. A value of 0 disables this timer. A timeout cancels the session and hangs up. Example: to disable the InActivity Timer, enter 9318000.

Default Seize Timeout

Parameter 19; default value 000 decimal, 00 hexadecimal, timer disabled. The Default Seize Timeout can be set to a value from 0 to 255 seconds. This is the maximum time permitted for the 1-4, 71-74, and 81 commands unless overridden for the session with the 02 command (section 2.14). When this timeout occurs, the command is aborted, and a Test or Program Prompt is returned after an Error Alert. A value of 0 disables this timer. Example: to set the Default Seize Timeout to 60 seconds, enter 9319060.

HookFlash Time

Parameter 20; default value 065 decimal, 41 hexadecimal. The HookFlash Time can be set to a value from 0 to 255 milliseconds. This is the on-hook time used to generate hookflash signals with the ##0 or *#0 call in-progress commands (section 2.6). Example: to set the HookFlash Time to 50 milliseconds, enter 9320050.

Escape Pound Time

Parameter 21; default value 000 decimal, 00 hexadecimal. The Escape Pound Time can be set to a value from 0 to 255 seconds. This sets a timeout after reception of a single # in the 2, 3, and 4 commands. If this value is nonzero, these commands may be completed immediately with the entry of ##. A nonzero value is required to gain access to the Extended Dialing Codes (section 3.9). A value of 0 disables that access, and a single # is used for command completion; it is preferable to use this setting if there is no need for Extended Dialing Codes. Example: to set the Escape Pound Time to 3 seconds, enter 9321003. With this setting, a 2 3 5551212 # standard DTMF dial command proceeds after three seconds; however, 2 3 5551212 ## commences dialing immediately.

Callback Hangup Time

Parameter 22; default value 030 decimal, 1E hexadecimal. The Callback Hangup Time can be set to a value from 0 to 255 seconds. This sets the amount of time the access line is left on-hook prior to dialing a callback number for the 05 command (section 2.16). It is necessary that this time is long enough to guarantee that the access call is cleared by the CO; the RTS-2 is the called party in the call used to access the unit, and the CO generally provides a grace period should the call be ended by the terminating number and the calling party remains off-hook. Example: to set the Callback Hangup Time to 15 seconds, enter 9322015.

3.8.7 Custom Settings: parameters 23 (Variable Tone Address, default value 015 decimal, 0F hexadecimal), 24 (Programmable Profile 2 Address, default value 015 decimal, 0F hexadecimal), 50-98 (data, not initialized by the 90173 command). Consult the manufacturer's website for these parameter settings, which can be used to program tone level and frequency for the 72 command, and special Gain Profiles.

3.8.8 Gain Profiles: several Gain Profiles are available for configuration during different modes of operation. Each has a value in the range 000-255 decimal.

The Rx path refers to signals emanating from the RTS-2, and the Tx path refers to signals entering the RTS-2. Adding a value of 128 decimal to the above profile values places the line into an adaptive balance mode: the unit dynamically adjusts its balance network continuously in the attempt to improve the 4-wire return loss. This isolates the receive and transmit paths internally -- the result is that it may be possible to successfully decode DTMF digits arriving in the transmit path in the presence of signal energy in the receive path.

Access Gain Profile

Parameter 25, default value 000 decimal, 00 hexadecimal, providing 0 dB gain. The Access Gain Profile is in place upon answering a line from the idle state, and remains in effect while in Test or Program Mode. Extreme care should be taken when modifying the Access Gain Profile, because an invalid setting can make it impossible to further control, or even re-access, the device. Should such an event occur, see section 5.1. Example: to set the Access Gain Profile to 3 dB gain, enter 9325002.

Dial Gain Profile

Parameter 26, default value 000 decimal, 00 hexadecimal, providing 0 dB gain. The Dial Gain Profile is in place when the RTS-2 is in the process of dialing out for the 2, 3, 4, and 05 commands. Example: to set the Dial Gain Profile to 3 dB loss, enter 9326005.

In Gain Profile

Parameter 27, default value 129 decimal, 81 hexadecimal, providing 1.5 dB loss and adaptive balance on the line used to access the RTS-2. The In Gain Profile is in place on the access line when the RTS-2 has established a talk path for the 1, 2, 3, and 4 commands. The adaptive balance setting is useful in this Gain Profile because it can separate the DTMF control signals arriving on the access (in) line from signals (such as milliwatt tones) arriving from the outgoing line.

Out Gain Profile

Parameter 28, default value 001 decimal, 01 hexadecimal, providing 1.5 dB loss on the outgoing line. The Out Gain Profile is in place on the outgoing line chosen in the command when the RTS-2 has established a talk path for the 1, 2, 3, and 4 commands.

Overall Path Gain

The overall gain between the access (in) and outgoing line in the path towards the access line is the sum of the Rx gain setting for the In Gain Profile and the Tx gain setting for the Out Gain Profile; in the path towards the outgoing line, the overall gain is the sum of the Tx gain setting for the In Gain Profile and the Rx gain setting for the Out Gain Profile. There is a compromise between path gain, stability, and path separation. The default settings provide an overall 3 dB bidirectional path loss, with adaptive balance on the access line. The overall path gain can be increased, depending upon the telephone network characteristics, but it may be necessary to remove the adaptive balance to achieve stability. The asymmetric gain profiles (3 and 4) can be used to increase path gain in one direction, such as towards the access line, when the unit is used to place essentially one-way test calls. Example: to set the overall path gain towards the access line to 0 dB and the overall path gain towards the outgoing line to 6 dB loss, enter 9327128 and 9328004. Symmetric gain profiles should be selected when actual two-way live talking is the intended usage.

Test Tone Gain Profile

Parameter 29, default value 128 decimal, 80 hexadecimal, providing 0 dB gain and adaptive balance. The Test Tone Gain Profile is in place when the RTS-2 is executing the 71, 72, 73, 74, and ##1 commands. The specified 0 dBm levels for the 71, 73, 74, and ##1 commands are only valid with a 0 dB Test Tone Gain Profile. These levels can be modified by the amount of loss in the Rx path of the selected Test Tone Gain Profile. A gain profile with gain (versus loss) in the Rx path must not be selected. The adaptive balance feature may make it possible to exit these commands while the tone is present; however, depending upon line conditions it may be necessary to wait for the periodic pause in the test tone generation. Example: to set the 71, 73, 74, and ##1 output levels to -3 dBm, enter 9329133.

Measurement Gain Profile

Parameter 30, default value 000 decimal, 00 hexadecimal, providing 0 dB gain. The Measurement Gain Profile is in place when the RTS-2 is executing the ##8 (or *#8) and 82 commands. It temporarily replaces the Out and Access Gain Profiles, respectively. The measurements shown in section 2.11 are only valid with a 0 dB Measurement Gain Profile. Example: to restore the default setting, enter 9330000.

Monitor Line Gain Profile

Parameter 31, default value 000 decimal, 00 hexadecimal, providing 0 dB gain. The Monitor Line Gain Profile is in place for the monitored line when the RTS-2 is executing the 81 command. The In Gain Profile is used for the access line. Example: to restore the default setting, enter 9331000.

3.8.9 Dial Strings: each command which takes an outgoing line off-hook first follows instructions stored in a Dial String specific to that operation. These Dial Strings are programmable to provide customization. Each Dial String is of variable length; the entire Dial String, with all of its codes, must fit in parameter range 35-49. The 2, 3, and 4 commands (sections 2.3-2.5) all utilize a common Dial String 234 starting at parameter 35. The other Dial Strings can begin anywhere in the parameter range 35-49. It is necessary to program the starting parameter for these variable location Dial Strings; the programmed value is 14 greater than the parameter number where the Dial String is located:

Dial String 1 Start

Parameter 32, default value 054 decimal, 36 hexadecimal, pointing to parameter 40. Parameter 40, default value 255 decimal, FF hexadecimal, is an end marker to do nothing.

Dial String ID Start

Parameter 33, default value 054 decimal, 36 hexadecimal, pointing to parameter 40. Parameter 40, default value 255 decimal, FF hexadecimal, is an end marker to do nothing.

Dial String Call Forwarding Start

Parameter 34, default value 054 decimal, 36 hexadecimal, pointing to parameter 40. Parameter 40, default value 255 decimal, FF hexadecimal, is an end marker to do nothing.

Dial String 234

The default values for Dial String 234, used for the 2, 3, and 4 commands, are:

These settings are suitable for loop or ground start lines. After line seizure, a test for the presence of loop current is made; if the outgoing line is a loop start line, and the line is operational, loop current will be present, and the code at parameter 36 is skipped; if the outgoing line is a ground start line, loop current will not be present, so the parameter 36 code is executed, which grounds the line for 1 second. In either case, the code at parameter 37 checks once again for the presence of loop current, which now should exist for either type of line. If none is detected, the line is faulty, and the command is aborted (an Error Alert is issued). If loop current is detected, progress continues at parameter 38. Parameters 38 and 39 together wait up to 5 seconds to detect the presence of a dialtone. If none occurs in this time period, the command is aborted. If dialtone is found, upon detection, progress continues with the next parameter. Parameter 40 marks the end of this Dial String; the digits entered with the 2, 3, or 4 commands are automatically redialed.

Dial String Codes

The various Dial Strings can be customized according to the application. The available codes, in decimal, are:

Stored Digits

The 240-242 Dial String codes dial a sequence of Stored Digits according to the line used to access the RTS-2. These Stored Digits are used for the Line Identification and Call Forwarding functions (section 3.8.5). Six parameters for each line hold these preprogrammed digit sequences:

Each of the Stored Digit sequences holds 0-12 digits; each of the six parameters assigned for a line holds 0, 1, or 2 digits. The parameter value is the sum of the values needed to represent the first and second digits. The first digit is represented by a decimal value of 0-9 x 16, for digits 0-9; if the first digit is unused, a value of 15 x 16 = 240 is used. The second digit is represented by a decimal value of 0-9, for digits 0-9; if the second digit is unused, a value of 15 is used. All six parameters must be programmed for any Stored Digit sequence which can be accessed. If Dial String codes accessing Stored Digits are only used for the Line Identification and Call Forwarding Dial Strings, then Stored Digits need only be programmed for those line numbers with nonzero entries in bit parameters 12 and 13.

Tone Codes

Dial String code 252 uses a Tone Code value for special purpose tone generation. Each of these codes activates a single or dual tone, which remains on. In practice, this is followed by a delay code. Next, the tone is turned off, by using any of the DTMF digit codes, or a dialtone detect code with a zero duration requirement. The tone codes are as follows:

3.8.10 Dial String Examples: Dial Strings may be organized in different ways according to application requirements.

Shortening Dial String 234

If Dial String space is at a premium for other functions, and ground start lines are not used, the initial loop current detect and subsequent Telco ground codes can be removed (237, 054 codes). The second loop current detect code can also be removed if desired, because the subsequent dialtone detect code (253) will surely fail if there is no loop current. If additional parameter space is required, the dialtone detect portion (089, 005) can be replaced with a fixed delay such as 178, which pauses two seconds. If all of this is done, then Dial String 234 becomes simply the two-parameter sequence 178, 255. Enter 9335178, 9336255; and the empty Dial String 1, Dial String ID, and Dial String Call Forwarding quantities must be repointed to the new location of the 255 code: enter 9332050, 9333050, and 9334050. This leaves parameters 37-49 available for other usage.

Using the 1 Command with Ground Start Lines

The default Dial String 1 does nothing; this permits the 1 (seize line) command to be used to connect to any audio source, without the necessity of providing loop current. However, in order to seize a ground start line, a Telco ground code must be issued. The Dial String 1 sequence can be pointed to the beginning of Dial String 234, which has a default setting to seize loop or ground start lines and wait for dialtone. To do so, enter 9332049.

Line Identification

Configure lines #4 and #5 for the Line Identification function (section 3.8.5, enter 9312024). Assume that for test purposes an 800 number has been directed in some load sharing arrangement to the directory numbers for those two lines as described in section 3.8.5. Terminations are made to line #4 for calls through AT&T, while terminations are made to line #5 for calls through MCI. It is desired that calls made to line #4 answer and respond with DTMF sequence 288, while line #5 responds with DTMF sequence 222 to represent those carriers' 10XXX codes. Test equipment is to be used to place test calls to the 800 number and record the DTMF responses in order to make real-world measurements of the load sharing performance. It is necessary to place the 288 and 222 codes into the Stored Digits areas for those two lines as follows:

The Dial String ID chosen is 241, 127, 000. This slow DTMF dials either the 288 or 222 Stored Digits; and looks for dialtone, but intentionally times out, because 0 seconds is allowed to detect a dialtone lasting 2.52 seconds. An end marker is not needed because there is no possibility that the last code will not abort the call. If the end marker code were used instead of the dialtone abort code, the call would not be automatically hung up after transmission of the desired DTMF codes. If Dial String 234 remains the default setting, it ends at parameter 40; Dial String ID will be stored beginning at parameter 41. Enter: 9333055 9341241 9342127 9343000 to store the Dial String ID start and contents.

Telco Call Forwarding

Configure line #6 for the Line Identification function (section 3.8.5, enter 9312032). In order to use the CO's call forwarding feature, the call is not passed through to another port, so line #6 is not configured for the Call Forwarding function. It is desired that calls made to line #6 answer and: generate a hookflash to put the incoming call on hold; wait for a new dialtone; dial 555-1212, the forwarded number; generate a hookflash to conference the calls together; and hang up to complete the task. It is necessary to place the forwarded number into the Stored Digits area for line #6 as follows:

The Dial String ID chosen is 254, 006, 089, 005, 240, 254, 006, 127, 000. This generates a 600 millisecond hookflash; waits for dialtone; standard DTMF dials Stored Digits 5551212; generates a second 600 millisecond hookflash; and looks for dialtone, but intentionally times out, because 0 seconds is allowed to detect a dialtone lasting 2.52 seconds. An end marker is not needed because there is no possibility that the last code will not abort the call. If it is necessary to keep the answered line off-hook to maintain the call, use the end marker code instead of the dialtone abort code. If Dial String 234 remains the default setting, it ends at parameter 40; Dial String ID will be stored beginning at parameter 41. Enter: 9333055 9341254 9342006 9343089 9344005 9345240 9346254 9347006 9348127 9349000 to store the Dial String ID start and contents.

Call Forwarding

Configure line #6 for the Call Forwarding function (section 3.8.5, enter 9313032). It is desired that calls made to line #6 answer and connect to line #1, dialing the forwarded number 1-410-555-1212. It is necessary to place the forwarded number into the Stored Digits area for line #6 as follows:

The Dial String Call Forwarding chosen is 237, 054, 089, 005, 240, 255. This grounds the line if there is no loop current; waits for dialtone; standard DTMF dials Stored Digits 14105551212; and exits. If Dial String 234 remains the default setting, and the Line Identification example above for lines #4 and #5 is used, the Dial String ID ends at parameter 43; Dial String Call Forwarding will be stored beginning at parameter 44. Enter: 9334058 9344237 9345054 9346089 9347005 9348240 9349255 to store the Dial String Call Forwarding start and contents.

3.9 Extended Dialing Codes

Access to Extended Dialing Codes is available for the 2, 3, and 4 commands if the Escape Pound Time parameter (section 3.8.6) is nonzero. These commands may include any of the Dial String codes (section 3.8.9) except those accessing Stored Digits (240-242). The 3-digit decimal value is preceded with a single #; the first digit must be entered before the time specified in the Escape Pound Time parameter elapses. Each complete extended dialing code value counts as one digit towards the maximum sequence length of 59. Example: to automatically dial 555-1234 on line #3, pause 10 seconds, generate a hookflash, wait up to 5 seconds to receive a second dialtone, dial 555-4321, pause 10 seconds, and generate a second hookflash (conference call), enter the following: 23 5551212 #202 #254 #006 #089 #005 5554321 #202 #254 #006 ##.

4. The Multiple Module Configuration

To accommodate more than eight Telco lines, one Master RTS-2 unit can be chained to as many as seven Slave RTS-2 units. This produces a two layer hierarchy. Configure the Master unit for line #7 and line #8 usage (sections 1.8, 3.8.2). Program the Master unit for the alternate call in-progress commands (section 3.8.2) with 9304004. The system is accessed by dialing into line #1 of the Master unit. Configure each of the Slave units for a Telephone Instrument connection on their line #1 ports (section 1.8), and connect those ports to lines #2 through #8 of the Master unit. Program the Slave units for automatic Test Mode entry with command 9304001 (section 3.8.2). (Use 9304009 for ARONTS applications.) Note that once this last command is issued, the only means to access Program Mode on the Slave units is either by use of the 01 New Access command (section 2.13), or dialing into ports other than #1. The Slave units may be configured for line #7 usage/monitoring capability and line #8 usage/ground start capability as desired. Line answering on the Slave units may be inhibited if desired (section 3.8.4, command 9311000).

The arrangement as described permits access to as many as 49 lines. In order to access a particular line, dial into the Master unit and enter the Test Code; use the Seize Line command (12-18) to select one of the Slave units; the selected Slave unit automatically provides a Test Prompt; and use any of the 1, 2, 3, and 4 commands to place calls on the outgoing Slave unit lines. The ### code is used to end the test call if another test call on that same Slave unit is to be made. The Master unit will not respond to that exit code, as the alternate call in-progress command set is selected for it. To release the Slave unit, enter *##, which ends the Seize Line command on the Master unit. The Slave unit automatically returns to its idle state. After releasing any Slave units, the Master unit is exited with 00 as for the single RTS-2 configuration.

Interconnections

5. In Case of Difficulty

If this chapter does not cover a specific problem of interest, it is suggested that the entire manual be thoroughly studied for assistance.

5.1 Hardware Program Mode Access

Should the Program Code be forgotten, or if all Telco lines have inadvertently been programmed to inhibit answering, or configured for special functions other than standard access, provision is made to directly be able to access the RTS-2. This method should also be used if the Access Gain Profile is programmed invalidly in such a way that a usable audio path is not established, or for any other programming mistakes which deny access to Program Mode.

Remove power and the Telco line from line #1. Jumper the RTS-2 for a Telephone Instrument on line #1 (section 1.8) by installing shorting clips 1-2, 3-4, and 5-6. Attach a standard analog telephone (with equivalent DC resistance 300 ohms or less) to line #1 and take it off-hook. Apply power to the RTS-2. The Program Prompt should be heard. Reprogram the unit as necessary. Restore jumper configuration and line #1 connections as desired.

5.2 Unit Does Not Answer Ring

If dialing a telephone line which the device should answer for access goes unanswered after the programmed number of rings, first check the Ring Indicator lamp (section 1.7) for the line in use. If the lamp does not flash, reflecting detection of ringing voltage, verify connections at the RJ-11C or RJ-21X jack. Be certain that the line itself is ringing by connecting a butt set or telephone to the line.

If the Ring Indicator shows the presence of ringing, count the incoming rings to determine when the RTS-2 should answer the line. Programming permits as many as 255 rings to be necessary. If the unit still does not answer, the line is probably programmed to inhibit answering on that line.

Access Program Mode via another line. If this cannot be done, see section 5.1 (it is possible to inhibit answering of all lines). From Program Mode, enable answering on all desired lines and program the number of rings to answer (section 3.8.4).

5.3 Unit Answers and Hangs Up

Verify that the Telco lines are connected to the jacks for the Telco lines (left RJ-11C's or J6 Line header) and not to the jacks for the CPE (right RJ-11C's or J7 Thru header). Check for a reasonable Access Time setting (section 3.8.6) and appropriate Line Answer function settings (section 3.8.5).

5.4 Unit Does Not Seize Ground Start Lines

If ground start lines do not seize when attempting to perform the Line Seizure command 1, but do for the 2, 3, and 4 commands, see section 3.8.10. If ground start lines do not operate with the 2, 3, and 4 dialing commands, check the earth ground connection on the terminal block. Verify that the RTS-2 is jumpered for ground start lines (section 1.8) and that parameter 03 is programmed for ground start lines (section 3.8.2). Check that nothing is connected to the line #8 Telco and CPE jacks. Verify that the ground start Dial String codes are included in the Dial String 234 (and Dial String 1 if desired) sequences (section 3.8.9). Watch to see if the line #8 Off-Hook Indicator (section 1.7) momentarily pulses when a 2, 3, or 4 command is issued. If not, the device programming is incorrect.

These problems do not affect the answering of incoming calls on ground start lines.

5.5 Contact the Manufacturer

For additional assistance, visit the manufacturer's website, www.ICengineering.com, follow the links to the RTS-2, and look through the FAQ's. If further help is required, click on the email request link and detail the problem.

5.6 Warranty

The RTS-2 Remote Test Set is warranted for a period of one year from date of purchase if it fails to function because of defects in materials or workmanship. The unit will be repaired or replaced at the option of the factory. The warranty does not cover damage resulting from accident, misuse or tampering; damage resulting from exposure to environmental extremes; and units that have been modified or altered.

All implied warranties, including any implied warranty of merchantability or fitness for any particular purpose are limited in duration to one year from date of purchase. The factory assumes no responsibility for consequential damages resulting from use of this product.

To qualify for service under the warranty, contact the factory for assignment of an RMA number. The unit must be returned, freight paid, with RMA number, proof of purchase, return address, and a description of the problem.

5.7 Specifications

6. Command Summary

Commands available from Test or Program Modes:

00: Hangup
01: Exit Test or Program Mode; provide Access Prompt
02tt: Modify timeout for commands 1-4, 71-74, 81, this session; tt=00-99 seconds
040: Standard call in-progress commands (###, ##0, ##8, ##1), this session
041: Alternate call in-progress commands (*##, *#0, *#8, *#1), this session
05dnn...n#[#]: Callback to telephone number nn...n, dial type d=2-4

1l: Seize line l
2lnn...n#[#]: DTMF dial telephone number nn...n at standard rate on line l
3lnn...n#[#]: DTMF dial telephone number nn...n at slow rate on line l
4lnn...n#[#]: Pulse dial telephone number nn...n on line l
5l: Listen for ringing on line l; exit with #, answer with * (v1.3 and later)

60: Identify the unit number, 6 digits
61: Identify the incoming line, 1 digit
62: Read the number of Test Mode accesses, 3 [6] digits
63: Read the number of Program Mode accesses, 3 [6] digits
64: Read the number of access Failures, 3 [6] digits
65: Read the number of access Answers, 3 [6] digits
66: Read the number of active Minutes, 3 [6] digits
67: Read the firmware version, 2 digits
68: Read the ROM checksum, 2 digits

71: 1000 Hz test signal at 0 dBm level
72: Test signal of programmable frequency and level
73: 3000 Hz test signal at 0 dBm level
74: 400 Hz test signal at 0 dBm level
While commands 71-74 are in progress, exit with #
v1.4 and later: exit with * if alternate call in-progress commands selected (041)

81l: Monitor line l, l=2-8
82: Measure and store signal level on access line
83: Read previously stored signal level, 2 digits
84: Playback DTMF digits; exit with #

While commands 1-4, 81 are in progress:
### [*##]: Release line and return to Test or Program Prompt
##8 [*#8]: Measure and store signal level on outgoing line

While commands 1-4 are in progress:
##0 [*#0]: send a hookflash
##1 [*#1]: Transmit 10 second 1000 Hz tone at 0 dBm to outgoing line (v1.4 and later)

l = 1-8 line number
n,c = 0-9, A-D digit
*: Cancel current entry

The 9 commands must be issued from Program Mode:

90173: Initialize all parameters except Unit ID (v1.0-1.2 see section 3.2)
90249: Clear all counts (62-66 commands)
91cc...c#cc...c#: Set the Test Code to cc...c (identical entry)
92cc...c#cc...c#: Set the Program Code to cc...c (identical entry)
93ppvvv: Write value vvv=000-255 decimal into parameter pp=00-98
94pp: Read parameter pp, 2 hexadecimal digits

Parameters pp:

00-02 ID

03 Bit Parameter -- sum values:

04 Bit Parameter -- sum values:

05 Disconnect Time, times 10 milliseconds
06-08 Ring On, Ring Off, Ring Loss Detect Times, tenth seconds
09-10 Number of Rings to Answer Line #1, Lines #2-8
11 Enable Line Answering; 128-64-32-16-8-4-2-1 = lines 8-1
12-14 Line Identification, Call Forwarding, Responder functions as above
15 Responder Cycles + 1
16 Access Time, seconds
17-18 Overall and InActivity Times, minutes (000=disable)
19 default Seize Timeout, seconds (000=disable)
20 HookFlash Time, milliseconds
21-22 Escape Pound, Callback Hangup Times, seconds
23-24 Custom 72 and Gain Profile settings
25-31 Access, Dial, In, Out, Test Tone, Measure, Monitor Gain Profiles: 000=0/0; 001=-1.5/-1.5; 002=+3/+3; 003=+3/-3; 004=-6/0; 005=-3/-3 (dB Rx/Tx, add 128 for adaptive balance)
32-34 Dial String 1, ID, Call Forwarding Starts; starting parameter + 14
35-49 Dial String 234 contents, must start at 35
35-49 Dial String 1, ID, Call Forwarding contents
50-98 Programmable Profiles and Variable Tone contents
51-98 Stored Digits, 6 parameters each, lines 1-8

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IC Engineering, Inc.
PO Box 321
Owings Mills, MD
21117-0321 USA