(TXT) View Source
       
       # RAD DATA COMMUNICATIONS
       
          MTM-20 (G.703 RJ-45, 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   | SW2  |
          |                               |          | loopback |      |
          |                               |          | test     |      |
          |                               |          | switch   |      |
          |-------------------------------+----------+----------+------|
          | G.703 port (see pinout below) |   CN2    | Remote   | SW3  |
          |                               |          | digital  |      |
          |                               |          | loopback |      |
          |                               |          | test     |      |
          |                               |          | switch   |      |
          |-------------------------------+----------+----------+------|
          | Line out (see pinout below)   |   SC1    | Test     | SW4  |
          |                               |          | pattern  |      |
          |                               |          | switch   |      |
          |-------------------------------+----------+----------+------|
          | Local digital loopback test   |   SW1    |          |      |
          | 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.           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         CN2 PINOUT                         |
          |------------------------------------------------------------|
          |     Function      | Terminal |   Function    |  Terminal   |
          |------------------------------------------------------------|
          | Not used                 |    1    | Transmit line  |  5   |
          |--------------------------+---------+----------------+------|
          | Not used                 |    2    | Receive line   |  6   |
          |--------------------------+---------+----------------+------|
          | Receive line             |    3    | Not used       |  7   |
          |--------------------------+---------+----------------+------|
          |   Transmit line          |    4    | Not used       |  8   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         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  |
          |----------------------------------------+-------+-----------|
          | í DCD forced high                      |  JP3  | Pins 3 &  |
          |                                        |       | 4 closed  |
          |----------------------------------------+-------+-----------|
          | DCD normal                             |  JP3  | Pins 1 &  |
          |                                        |       | 2 closed  |
          |----------------------------------------+-------+-----------|
          | í Signal ground connected to chassis   |  JP4  | Pins 1 &  |
          | ground                                 |       | 2 closed  |
          |----------------------------------------+-------+-----------|
          | Signal ground not connected to chassis |  JP4  | Pins 2 &  |
          | ground                                 |       | 3 closed  |
          |----------------------------------------+-------+-----------|
          | FIFO connected to transmit line        |  JP6  | Pins 1 &  |
          |                                        |       | 2 closed  |
          |----------------------------------------+-------+-----------|
          | FIFO connected to receive line         |  JP6  | Pins 2 &  |
          |                                        |       |  3 closd  |
          |----------------------------------------+-------+-----------|
          | í 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  |
          |----------+---------+---------+---------+---------+---------|
          |  í 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              |
          |----------------------------+-------------------------------|
          |         í Internal         |       Pins 1 & 2 closed       |
          |----------------------------+-------------------------------|
          |          External          |       Pins 3 & 4 closed       |
          |----------------------------+-------------------------------|
          |          Received          |       Pins 5 & 6 closed       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        LINE LENGTH                         |
          |------------------------------------------------------------|
          |              Setting              |          JP2           |
          |-----------------------------------+------------------------|
          |             í 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     |
          +------------------------------------------------------------+