USER MANUAL MODEL 2703 G.703/E1 Digital Modem Part# 07M2703-I Doc# 031041UI Revised 08/16/99 An ISO-9001 Certified Company SALES OFFICE (301) 975-1000 TECHNICAL SUPPORT (301) 975-1007 http://www.patton.
1.0 WARRANTY INFORMATION 1.3 SERVICE Patton Electronics warrants all Model 2703 components to be free from defects, and will—at our option—repair or replace the product should it fail within one year from the first date of shipment. This warranty is limited to defects in workmanship or materials, and does not cover customer damage, abuse, or unauthorized modification. If this product fails or does not perform as warranted, your sole recourse shall be repair or replacement as described above.
2.0 GENERAL INFORMATION 3.0 CONFIGURATION Thank you for your purchase of this Patton Electronics product. This product has been thoroughly inspected and tested and is warranted for One Year parts and labor. If any questions or problems arise during installation or use of this product, please do not hesitate to contact Patton Electronics Technical Support at (301) 975-1007. The Model 2703 is equipped with two sets of eight DIP switches (externally accessible), as well as seven jumpers (internal).
3.1.1 Switch Set S1 Switches S1-4 and S1-5: Rate Adaptation The configuration switches on S1 set clocking, rate adaptation, loopback enable, data invert, and interface (see also Switch S2). The default settings are summarized in table below. Set Switches S1-4 and S1-5 together to allow the Model 2703 to adapt to terminal devices that run at data rates less than 2.048 Mbps (The network rate remains 2.048 Mbps regardless of the terminal rate adaptation setting).
Switch S1-8: Loopback Test Enable Depending upon the setting of switch S1-8 the Model 2703 will either be continually in loopback mode, or loopback mode will be enabled by pressing and holding the front panel switch. Since the front panel switch is spring loaded–it returns to “Normal” operation when pressure is released–this DIP switch provides a way of leaving the Model 2703 in “unattended” loopback mode for remote test purposes.
The internal jumpers mounted on the Model 2703’s PC board (labeled LK1 - LK7) are used to configure the 75 ohm or 120 ohm network link parameters. Figure 4 (above) shows the location of the Model 2703’s jumpers on the internal PC board. The table below shows the factory default jumper settings. Following the table are descriptions for each jumper. NOTE: One combination of jumper settings is required for 75 ohm operation, and another combination is required for 120 ohm operation.
4.0 INSTALLATION Jumper LK6 & LK7: 75 Ohm Termination Impedance This jumper sets the termination impedance correctly for 75 Ohm operation. Both jumpers must be in place when operating in 75 Ohm (unbalanced) mode. Conversely, both jumpers must be removed when operating in 120 Ohm (balanced) mode. Once the Model 2703 is properly configured, it is ready to connect to your system. This section tells you how to properly connect the Model 2703 to the G.703 network and terminal device interfaces. 4.
5.0 OPERATION 4.2 CONNECTION TO THE TERMINAL DEVICE The Model 2703 is wired as a DCE, and–when configured properly–supports communication with a wide variety of terminal (DTE) devices. Compatible interface standards include EIA-530 (RS-422), CCITT X.21 and CCITT V.35. All interfaces are supported on a female UD-26 connector (a subminiature 26-pin “D” connector designated the “alt A” in the EIA-232 Standard).
APPENDIX A 5.3 LOOPBACK TEST (LAL) PATTON MODEL 2703 SPECIFICATIONS The Model 2703 is equipped with a Local Analog Loopback (LAL) mode to assist in evaluating the operation of the local Model 2703. Any data sent to the local Model 2703 in this test mode will be echoed (returned) back to the user device. For example, characters typed on the keyboard of a terminal will appear on the terminal screen. To perform a LAL test, follow these steps: A.
APPENDIX B PATTON MODEL 2703 PIN CONFIGURATIONS APPENDIX C PATTON MODEL 2703 FACTORY PARTS AND ACCESSORIES C-1 Basic Standalone Units UNIVERSAL D-26 INTERFACE (DCE WIRING) Not Used -26 Not Used -25 Not Used -24 Data Term Ready (DTR/) -23 Data Set Ready (DSR/) -22 Not Used -21 Data Term Ready (DTR) -20 Request to Send (RTS/) -19 Not Used -18 Receive Clock (RC) -17 Receive Data (RD/) -16 Transmit Clock (TC) -15 Transmit Data (TD/) -14 13- (CTS/) Clear to Send 12- (TC/) Transmit Clock 11- Not Used 10- (CD/
APPENDIX C (contd) PATTON MODEL 2703 FACTORY PARTS AND ACCESSORIES C-3 Terminal (DTE) Interface Cables No terminal (DTE) cable is supplied with the Model 2703. You may construct your own cable using the pin-out diagrams in Appendix B, or purchase one of the Patton’s standard adapter cables listed below. Custom lengths are available. Note: The part numbers below are completely distinct from the model number/suffix combinations shown on the previous page.
