(TXT) View Source
       
       # RAD DATA COMMUNICATIONS
       
          MTM-20 (V.36, DC POWER)
       
          Card Type         Modem (synchronous)                          
          Chipset           Unidentified                                 
          Transfer Rate     32/64Kbps                                    
          Data Modulation   QAM                                          
          Data Bus          Serial                                       
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |       Function       | Label |      Function       | Label |
          |----------------------+-------+---------------------+-------|
          | DC power in          |  CN1  | Analog loopback     |  SW2  |
          |                      |       | test switch         |       |
          |----------------------+-------+---------------------+-------|
          | V.36 serial port     |  CN2  | Remote digital      |  SW3  |
          |                      |       | loopback test       |       |
          |                      |       | switch              |       |
          |----------------------+-------+---------------------+-------|
          | Line out (see pinout |  SC1  | Test pattern switch |  SW4  |
          | below)               |       |                     |       |
          |----------------------+-------+---------------------+-------|
          | Local digital        |  SW1  |                     |       |
          | loopback test switch |       |                     |       |
          |------------------------------------------------------------|
          |      Note:Modem can be made to perform self-test by        |
          |      holding down SW2 and SW4. The DCD, TEST, and SQ LEDs  |
          |      should go on, and the RD LED should go off.           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         SC1 PINOUT                         |
          |------------------------------------------------------------|
          |    Function     | Terminal |      Function      | Terminal |
          |-----------------+----------+--------------------+----------|
          | Ground          |    1     | Not used           |    5     |
          |-----------------+----------+--------------------+----------|
          | Not used        |    2     | Transmit line      |    6     |
          |-----------------+----------+--------------------+----------|
          | Receive line    |    3     |   Transmit line    |    7     |
          |-----------------+----------+--------------------+----------|
          | Receive line    |    4     |                    |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |                Setting                 | Label | Position  |
          |----------------------------------------+-------+-----------|
          | » | DCD forced high                    |  JP3  | Pins 3 &  |
          |   |                                    |       | 4 closed  |
          |---+------------------------------------+-------+-----------|
          |   | DCD normal                         |  JP3  | Pins 1 &  |
          |   |                                    |       | 2 closed  |
          |---+------------------------------------+-------+-----------|
          | » | Signal ground connected to chassis |  JP4  | Pins 1 &  |
          |   | ground                             |       | 2 closed  |
          |---+------------------------------------+-------+-----------|
          |   | Signal ground not connected to     |  JP4  | Pins 2 &  |
          |   | chassis ground                     |       | 3 closed  |
          |---+------------------------------------+-------+-----------|
          | » | Line speed set to 64Kbps           |  SW5  | Position  |
          |   |                                    |       |     4     |
          |---+------------------------------------+-------+-----------|
          |   | Line speed set to 32Kbps           |  SW5  | Position  |
          |   |                                    |       |     3     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       TRANSMIT LEVEL                       |
          |------------------------------------------------------------|
          |   Setting   |  JP5/A  |  JP5/B  | JP5/C  | JP5/D  | JP5/E  |
          |-------------+---------+---------+--------+--------+--------|
          | » |  0dBm   | Closed  |  Open   |  Open  |  Open  |  Open  |
          |---+---------+---------+---------+--------+--------+--------|
          |   |  -3dBm  |  Open   | Closed  |  Open  |  Open  |  Open  |
          |---+---------+---------+---------+--------+--------+--------|
          |   |  -6dBm  |  Open   |  Open   | Closed |  Open  |  Open  |
          |---+---------+---------+---------+--------+--------+--------|
          |   |  -9dBm  |  Open   |  Open   |  Open  | Closed |  Open  |
          |---+---------+---------+---------+--------+--------+--------|
          |   | -12dBm  |  Open   |  Open   |  Open  |  Open  | Closed |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        CLOCK SOURCE                        |
          |------------------------------------------------------------|
          |          Setting           |              JP1              |
          |----------------------------+-------------------------------|
          | » |        Internal        |       Pins 1 & 2 closed       |
          |---+------------------------+-------------------------------|
          |   |        External        |       Pins 3 & 4 closed       |
          |---+------------------------+-------------------------------|
          |   |        Received        |       Pins 5 & 6 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        LINE LENGTH                         |
          |------------------------------------------------------------|
          |                Setting                |        JP2         |
          |---------------------------------------+--------------------|
          | » |              0-10Km               | Pins 3 & 4 closed  |
          |---+-----------------------------------+--------------------|
          |   |              7-13Km               | Pins 1 & 2 closed  |
          |---+-----------------------------------+--------------------|
          |   | Auto select (not yet implemented) | Pins 5 & 6 closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          | LED  | Color  |  Status  |            Condition            |
          |------+--------+----------+---------------------------------|
          | PWR  | Green  |    On    |           Power is on           |
          |------+--------+----------+---------------------------------|
          | PWR  | Green  |   Off    |          Power is off           |
          |------+--------+----------+---------------------------------|
          | RTS  | Yellow |    On    |       RTS signal is high        |
          |------+--------+----------+---------------------------------|
          | RTS  | Yellow |   Off    |        RTS signal is low        |
          |------+--------+----------+---------------------------------|
          |  TD  | Yellow |    On    |    DSU is transmitting SPACE    |
          |------+--------+----------+---------------------------------|
          |  TD  | Yellow |   Off    |     DSU is not transmitting     |
          |------+--------+----------+---------------------------------|
          |  TD  | Yellow | Blinking |    DSU is transmitting data     |
          |------+--------+----------+---------------------------------|
          |  RD  | Yellow |    On    |     DSU is receiving SPACE      |
          |------+--------+----------+---------------------------------|
          |  RD  | Yellow |   Off    |      DSU is not receiving       |
          |------+--------+----------+---------------------------------|
          |  RD  | Yellow | Blinking |      DSU is receiving data      |
          |------+--------+----------+---------------------------------|
          | DCD  | Yellow |    On    |     Carrier signal detected     |
          |------+--------+----------+---------------------------------|
          | DCD  | Yellow |   Off    |   Carrier signal not detected   |
          |------+--------+----------+---------------------------------|
          | TEST |  Red   |    On    |       DSU is in test mode       |
          |------+--------+----------+---------------------------------|
          | TEST |  Red   |   Off    |     DSU is not in test mode     |
          |------+--------+----------+---------------------------------|
          |  SQ  | Yellow |    On    |     Signal quality is good      |
          |------+--------+----------+---------------------------------|
          |  SQ  | Yellow | Blinking | Signal quality is poor or test  |
          |      |        |          |     pattern contains errors     |
          +------------------------------------------------------------+