RAD DATA COMMUNICATIONS
=======================

   SRM-31A

   Card Type                Short Range Modem                     
   Chip Set                 Unidentified                          
   I/O Options              25-pin DTE port, terminal block       
   Wiring Type              Unshielded twisted pair               
   Maximum Data Rate        115.2Kbps                             
   Data Modulation Protocol 2B1Q                                  
   Data Bus                 External                              

<gopher://bitreich.org/I/th99/t/P-R/54936-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |        Function         |     Label     | Function | Label |
   |------------------------------------------------------------|
   | DTE serial port     |   CN1   | Terminal block   |   CN2   |
   | (25-pin connector)  |         |                  |         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED | Color  | Status |             Condition              |
   |-----+--------+--------+------------------------------------|
   | LOS |  Red   |   On   | Loss of signal condition detected  |
   |     |        |        |             on network             |
   |-----+--------+--------+------------------------------------|
   | LOS |  Red   |  Off   |    Loss of signal condition not    |
   |     |        |        |        detected on network         |
   |-----+--------+--------+------------------------------------|
   | TST |  Red   |   On   |  Device is conducting a loopback   |
   |     |        |        |                test                |
   |-----+--------+--------+------------------------------------|
   | TST |  Red   |  Off   |     Device is not conducting a     |
   |     |        |        |           loopback test            |
   |-----+--------+--------+------------------------------------|
   | RX  | Yellow |   On   |       Data is being received       |
   |-----+--------+--------+------------------------------------|
   | RX  | Yellow |  Off   |     Data is not being received     |
   |-----+--------+--------+------------------------------------|
   | TX  | Yellow |   On   |     Data is being transmitted      |
   |-----+--------+--------+------------------------------------|
   | TX  | Yellow |  Off   |   Data is not being transmitted    |
   |-----+--------+--------+------------------------------------|
   | PWR | Green  |   On   |            Power is on             |
   |-----+--------+--------+------------------------------------|
   | PWR | Green  |  Off   |            Power is off            |
   +------------------------------------------------------------+