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USER
MANUAL
MODEL 2703-X21
G.703/E1 Digital Modem
SALES OFFICE
Part# 07M2703-X21-C
Doc# 031111UC
(301) 975-1000
Revised 6/19/98
TECHNICAL SUPPORT
CERTIFIED
(301) 975-1007
An ISO-9001
http://www.patton.com
Certified Company
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1.0 WARRANTY INFORMATION 2.0 GENERAL INFORMATION Patton Electronics warrants all Model 2703-X21 components to Thank you for your purchase of this Patton Electronics product. be free from defects, and will—at our option—repair or replace the This product has been thoroughly inspected and tested and is product should it fail within one year from the first date of shipment. warranted for One Year parts and labor. If any questions or problems This warranty is limited to defects in workmanship or
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3.0 CONFIGURATION Switch Set S1 The Model 2703-X21 is equipped with one DIP set containing eight The configuration switches on S1 set clocking, rate adaptation, switches (externally accessible), as well as seven jumpers (internal). loopback enable, and data invert. The default settings are These switches and jumpers allow configuration of clocking, data rate, summarized in the table below. and test options. The Model 2703-X21 is also equipped with an internal switch that allows selection of
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S1-2 and S1-3: Rate Adaptation 3.2 INTERNAL JUMPER SETTINGS Switches S1-2 and S1-3 are set in combination to allow the Model The Model 2703-X21’s seven jumpers are located on the PC board 2703-X21 to adapt to terminal devices running at data rates of less than inside the unit. To access the jumpers, follow these instructions: 2.048 Mbps (The network rate remains 2.048 Mbps regardless of the terminal rate adaptation setting). The setting you select should match 1. Insert a flat head screw dri
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LK1: 75 Ohm Transmit Shield-to-Ground Connection This setting determines whether the shield of the 75 Ohm (coax) transmit cable is connected to earth ground. This connection must be LK2 made when operating in 75 Ohm (unbalanced) mode. Conversely, this connection must not be made when operating in 120 Ohm (balanced) mode. LK6 LK1 Setting LK7 LK5 Strap On 75 Ohm TX Shield-to-GND Connection Made LK3 Strap Off 75 Ohm TX Shield-to-GND Connection Broken LK2: 75 Ohm Receive Shield-to-Ground Connect
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LK5: Configuration Auto-Sense 3.3 POWER SUPPLY OPTIONS This setting determines whether the host can automatically sense The Model 2703-X21 is available with three power supply options: the configuration of the Applique. The operation of the Applique is not The Standard power supply option (Model 2703-X21 or 2703-X21- affected by this jumper setting. Auto-sense should be enabled when 230) is factory configured for either 115 or 230 VAC, depending on operating in 75 Ohm (unbalanced) mode. C
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4.0 INSTALLATION 4.2 CONNECTION TO THE TERMINAL DEVICE Once the Model 2703-X21 is properly configured, it is ready to The Model 2703-X21 is wired as a DCE, and–when configured connect to your system. This section tells you how to properly connect properly–supports communication with an X.21 DTE device. The Model the Model 2703-X21 to the G.703 network and terminal device 2703-X21 is equipped with a DB-15 female connector and uses a interfaces. standard X.21 patch cable, wired straight throu
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5.0 OPERATION 5.3 LOOPBACK TEST (LAL) Once the Model 2703-X21 is properly configured and installed, it should operate transparently. This sections describes power-up, The Model 2703-X21 is equipped with a Local Analog Loopback reading the LED status monitors, and using the built-in loopback test (LAL) mode to assist in evaluating the operation of the local Model modes. 2703-X21. Any data sent to the local Model 2703-X21 in this test mode will be echoed (returned) back to the user device. F
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APPENDIX A APPENDIX B MODEL 2703-X21 PIN CONFIGURATIONS PATTON MODEL 2703 SPECIFICATIONS Network Interface: G.703 CCITT X.21 INTERFACE (DB-15) Network Rate: 2.048 Mbps Network Connectors: Two BNC (75 Ohm) and one modular RJ-45 connector (120 1- Frame Ground 1 FRAME GROUND Ohm) Transmit - B - 9 2- Transmit - A TRANSMIT B 9 2 TRANSMITTED - A Control - B -10 Terminal Interface: X.21 on female DB-15 connector 3- Control - A CONTROL B 10 3 CONTROL - A Receive - B -11 4- Receive - A Terminal
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APPENDIX C FACTORY PARTS AND ACCESSORIES APPENDIX D SAFETY WARNINGS AND REQUIREMENTS C-1 Basic Standalone Units These warning notices apply to the Input Port, the port marked “Network”. The Patton Model 2703-X21 standalone digital modem is available in three versions, depending upon the power supply installed. The Warning: The port marked “SAFETY WARNING: see instructions Standard and Universal Interface versions are supplied with a power for use” does not provide isolation sufficient to satisf
