USER MANUAL MODEL 2500 Series Models 2500, 2510, 2520 All-Rate CSU/DSU Part# 07M2500-C Doc# 099021UC Revised 3/13/96 SALES OFFICE (301) 975-1000 TECHNICAL SUPPORT (301) 975-1007
TABLE OF CONTENTS Section 1.0 GENERAL INFORMATION Page 1.0 General Information ...............................................................2 1.1 Warranty Statement 1.2 Radio and TV Interference 1.3 FCC Information 1.4 Service Information 2.0 Product Overview ..................................................................4 2.1 Product Features 2.2 General Product Description 2.3 Supported Applications 3.0 Installation .............................................................................6 3.
2.0 PRODUCT OVERVIEW 1.3 FCC INFORMATION The Model 2500 Series has been tested and registered in compliance with the specifications in Part 68 of the FCC rules. A label on the equipment bears the FCC registration number. You may be requested to provide this information to your telephone company. Your telephone company may make changes in its facilities, equipment, operations or procedures that could affect the proper operation of the Model 2500 Series.
3.0 INSTALLATION 2.3 SUPPORTED APPLICATIONS The Model 2500 Series includes three units: the Model 2500 AllRate CSU/DSU, the Model 2510 Switched 56 CSU/DSU and the Model 2520 All-Rate/Switched 56 CSU/DSU. Depending upon the unit selected, the Mode 2500 Series supports three distinct modes of operation.
4.0 CONFIGURATION 3.2 NETWORK INTERFACE CONNECTION The Network Interface is an 8 position modular connector. Connect this port to the RJ-48S jack provided by the digital data service provider. If the Model 2500 Series is being used for private short haul communication, the twisted pair cable will connect to this port. See Appendix D for the pin assignments of this connector. Before you can operate your Model 2500 Series CSU/DSU, you must configure the unit.
ON For line rates of 56 and 64 kbps, it is possible to operate the DTE interface at a lower rate. To do this, set these switches to 56 or 64 kbps and set the Rate Converter/DTE Rate switches as required. Circuit Assurance Figure 2. Close up of DIP switches showing ON/OFF positions. 4.1.1 SWITCH SET SW1 The configuration switches on switch set SW1 allow you to specify Line Rate, Circuit Assurance, RTS, Character Length, Data Format and DSR Loop Status.
Character Length 4.1.2 SWITCH SET SW2 In asynchronous data format, 10 and 11 bit characters are supported. This setting is ignored in synchronous data format. The configuration switches on switch SW2 control the Rate Adapter/DTE Rate, Clock Mode, Anti-Stream Timer and RTS/CTS Delay. Figure 5 (below) summarizes SW2 switch settings, including the factory defaults. Following Figure 4 is a description of each switch setting.
DTE Loop Control CTS Delay The local loop and remote loop can be activated from the DTE interface using signals “LL” and “RL”. SW2-4 On Off The RTS/CTS turn-on delay can be set to Normal or Extended. SW2-8 Off On Enable LL and RL inputs Disable CTS Delay Normal Extended Delay in mSec at Various Line Rates 56 19.2 9.6 4.8 2.4 0.3 0.9 1.9 3.8 7.5 1.3 3.8 7.5 15 30 Clock Mode 4.
4.2.1 USING THE SOFTWARE MENU SYSTEM The Model 2500 Series Menu System operates as follows: 1) All selections must be followed by [RETURN]. 4.2.3 SETTING SOFTWARE SWITCH PARAMETERS From the Main Menu, selecting item 3, “Set Software Switch Parameters” will take you to the Software Switch Menu (below). From this screen, you can select any parameters that you wish to soft configure. 2) To make a selection from any menu, enter the option number at the prompt and press [RETURN].
Circuit Assurance Character Length Choosing option 2 in the Software Switch Menu takes you to the Circuit Assurance Menu (below). On dedicated (DDS) circuits, the transmitter and the CTS output can be configured to go ON only when a working communication circuit is established. If you use Circuit Assurance with DDS services, enable it on only one end of the communication link. For Switched-56 service, enable Circuit Assurance on both ends of the circuit.
Note2: You can use the Model 2500 Series to transmit lower-speed asynchronous data (up to 9.6 kbps) over synchronous circuits by simple over-sampling. To do this, select the synchronous data format and set the line Line Rate (Software Switch Menu option 1) to at least four times that asynchronous data rate you wish to send. For example, use a Line Rate of 9.6 kbps or higher for 2.4 kbps async data.
Clock Mode Choosing option 9 in the Software Switch Menu takes you to the Clock Mode Menu (below). Anti-Streaming Timer Choosing option “a” in the Software Switch Menu takes you to the Anti Stream Timer Menu (below). (Note: You must use lower case letters for options “a” thru “e”) This option lets you enable or disable the anti-streaming timer, which protects multidrop networks from a drop that is continuously transmitting.
5.0 OPERATION • “OS” glows red to indicate Out-of-Service. This means the Model 2500 Series has received an Out-of-Service signal from the digital service provider and indicates a problem with the service provider’s equipment. If this condition persists, contact your service provider. • “ER” glows red to indicate that an error has been detected in the received signal. ER will flash if the Model 2500 Series receives illegal bi-polar violations or framing errors.
In the Read Configuration Menu, you may select item 1 to read the hardware switch configuration or item 2 to read the software switch configuration. A sample screens is shown below: 5.3 LOOPBACK TEST MODES The Model 2500 Series offers three loopback tests to evaluate the condition of the CSU/DSUs and the communication link: local analog loopback, remote digital loopback and telco loopback (C.O. Loopback). 5.3.
LAL Test Procedure Once LAL is activated, the Model 2500 Series transmit output is connected to its own receiver. The “Test” LED should be lit. Follow these steps to complete the test: 1) Verify that the data terminal equipment is operating properly and can be used for a test. If a fault is indicated, call a technician or replace the unit. 2) Activate the RL lead from the DTE (Note: in order to use this option, the DTE Loop Control option must be enabled–see Section 4.1.2).
CSU Loop The CSU Loop is activated when the central office reverses the DC sealing current that flows between the TX pair and the RX pair. In this case, the Model 2500 Series recognizes this and loops signals on the RX pair back to the central office on the TX pair (see Figure 8, below). While the CSU Loop is activated by the central office, the TM light is illuminated. Figure 8.
5.5 SWITCHED 56 DIALING COMMANDS (MODELS 2510 & 2520) CAUTION! For proper Switched 56 operation, you must enable the Circuit Assurance and Force RTS options as described in Section 4.0. Failure to do so may prevent the Model 2500 Series unit from answering incoming Switched 56 calls. To access the Switched 56 dialing capabilities of the Mode 2500 Series, go to the Main Menu (see Section 4.2) and select item 5, “Set Switched 56 Dialing Parameters”. This will take you to the Switched 56 Menu (see below).
APPENDIX A SPECIFICATIONS APPENDIX B CABLE RECOMMENDATIONS DDS Type: Dedicated Transmission Format: Asynchronous, synchronous Interface: RS-232 and V.35 Standards: AT&T 62310 compliant DDS Line Rates: 2.4, 4.8, 9.6, 19.2, 56 and 64 kbps DTE Rates: 2.4, 4.8, 9.6, 19.2, 38.4, 56, and 64 kbps; 57.
APPENDIX C FACTORY REPLACEMENT PARTS AND ACCESSORIES APPENDIX D INTERFACE PIN ASSIGNMENT DDS INTERFACE Patton Model # Description The DDS Interface is an RJ-48S modular jack. 10-2500 ...........................DDS Cable, RJ48 - RJ48, 6 foot 10-561S...........................Control Port Cable, EIA-561, 6ft, shielded 12M-561 ..........................Adapter, EIA-561 to DB-25 Male 12F-561 ...........................Adapter, EIA-561 to DB-25 Female 082R2..............................
(APPENDIX D - Continued) APPENDIX E TRANSMITTER CLOCK SOURCE DURING TEST LOOPS DB-25 CONNECTOR, TERMINAL INTERFACE Pin # 1 2 3 4 5 6 7 8 15 17 18 20 21 24 25 Signal Frame Ground TD RD RTS CTS DSR SGND (Signal Ground) CD TC RC LL (Local Loop) DTR RL (Remote Loop) XTC TM (Test Mode) Clock Mode Internal External Network Normal Analog Loop Originating Remote Loop Receiving Remote Loop INT EXT RC INT INT INT INT EXT RC RC EXT RC RC = Received Clock CONTROL PORT INTERFACE 8 Position modular connecto
