PATTON ELECTRONICS COMPANY
==========================

   2703-X.21

   Card Type         E1 Modem                                     
   Chip Set          Unidentified                                 
   I/O Options       AC power connector, 15-pin DTE connector,    
                                                                  
                     BNC network connectors (2), RJ-45 network    
                     connector                                    
   Maximum Data Rate 2.048Mbps                                    
   Data Bus          External                                     

<gopher://bitreich.org/I/th99/t/P-R/54968-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |         Function          |   Label    | Function  | Label |
   |------------------------------------------------------------|
   | Power connector        |  CN1  | RJ-45 120Ohm    |   CN4   |
   |                        |       | twisted pair    |         |
   |                        |       | connector       |         |
   |------------------------+-------+-----------------+---------|
   | X.21 DTE port (15pin   |  CN2  | BNC 75Ohm       |   CN5   |
   | connector)             |       | coaxial         |         |
   |                        |       | connector       |         |
   |------------------------+-------+-----------------+---------|
   | BNC 75Ohm coaxial      |  CN3  | Power switch    |   SW3   |
   | connector              |       |                 |         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                Setting                | Label |  Position  |
   |---------------------------------------+-------+------------|
   | i 75Ohm transmit shield to ground     |  LK1  |   Closed   |
   |---------------------------------------+-------+------------|
   | 120Ohm transmit shield to ground      |  LK1  |    Open    |
   |---------------------------------------+-------+------------|
   | i 75Ohm receive shield to ground      |  LK2  |    Open    |
   | connection broken                     |       |            |
   |---------------------------------------+-------+------------|
   | 75Ohm receive shield to ground made   |  LK2  |   Closed   |
   |                                       |       | (optional) |
   |---------------------------------------+-------+------------|
   | i Factory configured - do not alter   |  LK3  |    Open    |
   |---------------------------------------+-------+------------|
   | i 1200Ohm shield to ground broken     |  LK4  |    Open    |
   |---------------------------------------+-------+------------|
   | 120Ohm shield to ground made          |  LK4  |   Closed   |
   |                                       |       | (optional) |
   |---------------------------------------+-------+------------|
   | i Auto-sense enabled                  |  LK5  |   Closed   |
   |---------------------------------------+-------+------------|
   | Auto-sense disabled                   |  LK5  |    Open    |
   |---------------------------------------+-------+------------|
   | i Device is master (clock generated   | S1/1  |     On     |
   | internally)                           |       |            |
   |---------------------------------------+-------+------------|
   | Device is slave. (clock recovered     | S1/1  |    Off     |
   | from network)                         |       |            |
   |---------------------------------------+-------+------------|
   | i Loopback activated by front panel   | S1/4  |    Off     |
   |---------------------------------------+-------+------------|
   | Continual loopback mode enabled       | S1/4  |     On     |
   |---------------------------------------+-------+------------|
   | i Data inversion disabled             | S1/5  |    Off     |
   |---------------------------------------+-------+------------|
   | Data inversion enabled                | S1/5  |     On     |
   |---------------------------------------+-------+------------|
   | i Factory configured - do not alter   | S1/6  |    Off     |
   |---------------------------------------+-------+------------|
   | i Factory configured - do not alter   | S1/7  |    Off     |
   |---------------------------------------+-------+------------|
   | i Factory configured - do not alter   | S1/8  |    Off     |
   |---------------------------------------+-------+------------|
   | Loopback test activated               |  SW2  |     On     |
   |---------------------------------------+-------+------------|
   | Normal mode. Loopback test not        |  SW2  |    Off     |
   | activated                             |       |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       LINE IMPEDANCE                       |
   |------------------------------------------------------------|
   |             Setting             |    LK6     |     LK7     |
   |---------------------------------+------------+-------------|
   |         75Ohm operation         |   Closed   |   Closed    |
   |---------------------------------+------------+-------------|
   |        120Ohm operation         |    Open    |    Open     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      RATE ADAPTATION                       |
   |------------------------------------------------------------|
   |             Setting             |    S1/2    |    S1/3     |
   |---------------------------------+------------+-------------|
   |             256Kbps             |     On     |     On      |
   |---------------------------------+------------+-------------|
   |             512Kbps             |    Off     |     On      |
   |---------------------------------+------------+-------------|
   |            1.024Mbps            |     On     |     Off     |
   |---------------------------------+------------+-------------|
   |           i 2.048Mbps           |    Off     |     Off     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED  | Color | Status |             Condition              |
   |------+-------+--------+------------------------------------|
   | PWR  |  Red  |   On   |            Power is on             |
   |------+-------+--------+------------------------------------|
   | PWR  |  Red  |  Off   |            Power is off            |
   |------+-------+--------+------------------------------------|
   | NET  | Green |   On   |     Network connection is good     |
   |------+-------+--------+------------------------------------|
   | NET  | Green |  Off   |    Network connection is broken    |
   |------+-------+--------+------------------------------------|
   | MCL  | Green |   On   |  Device is configured as a master  |
   |      |       |        |             clock unit             |
   |------+-------+--------+------------------------------------|
   | MCL  | Green |  Off   |  Device is configured as a slave   |
   |      |       |        |                unit                |
   |------+-------+--------+------------------------------------|
   | LOOP | Green |   On   |  Device is conducting a loopback   |
   |      |       |        |                test                |
   |------+-------+--------+------------------------------------|
   | LOOP | Green |  Off   |     Device is not conducting a     |
   |      |       |        |           loopback test            |
   +------------------------------------------------------------+