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

   MTM-15

   Modem Type               Data (synchronous/asynchronous)       
   Maximum Data Rate        19.2Kbps                              
   Data Bus                 External                              
   Data Modulation Protocol Proprietary                           

<gopher://bitreich.org/I/th99/t/P-R/51484-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |  Purpose   | Location |         Purpose         | Location |
   |------------+----------+-------------------------+----------|
   | RS-232/422 |   CN1    | Digital loopback switch |   DIG    |
   |------------+----------+-------------------------+----------|
   | DC power   |   CN2    | Local loopback switch   |   ANA    |
   |------------+----------+-------------------------+----------|
   | Transmit   |   XMT    | Remote digital loopback |   REM    |
   |            |          | switch                  |          |
   |------------+----------+-------------------------+----------|
   | Receive    |   RCV    | Test switch             |   PATT   |
   |------------+----------+-------------------------+----------|
   | Ground     |   GND    | Reset                   |  RESET   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      ANALOG LOOPBACK                       |
   |------------------------------------------------------------|
   | Setting                    |              JP3              |
   |----------------------------+-------------------------------|
   | Enabled                    |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |>> Disabled                 |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |           ASYNCHRONOUS TO SYNCHRONOUS DEVIATION            |
   |------------------------------------------------------------|
   | Setting                       |           SW2/S4           |
   |-------------------------------+----------------------------|
   |>> 12.5%                       |            Off             |
   |-------------------------------+----------------------------|
   | 25%                           |             On             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         BAUD RATE                          |
   |------------------------------------------------------------|
   | Setting                       |            SW1             |
   |-------------------------------+----------------------------|
   | 1.2Kbps                       |             0              |
   |-------------------------------+----------------------------|
   | 2.4Kbps                       |             1              |
   |-------------------------------+----------------------------|
   | 4.8Kbps                       |             2              |
   |-------------------------------+----------------------------|
   |>> 9.6Kbps                     |             3              |
   |-------------------------------+----------------------------|
   | 19.2Kbps                      |             4              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                          BIT STOP                          |
   |------------------------------------------------------------|
   | Setting            |      SW2/S2       |      SW2/S3       |
   |--------------------+-------------------+-------------------|
   | 8 bits             |        Off        |        Off        |
   |--------------------+-------------------+-------------------|
   | 9 bits             |        Off        |        On         |
   |--------------------+-------------------+-------------------|
   |>> 10 bits          |        On         |        Off        |
   |--------------------+-------------------+-------------------|
   | 11 bits            |        On         |        On         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         CD SIGNAL                          |
   |------------------------------------------------------------|
   | Setting            |   JP2 Pin 1 & 2   |   JP2 Pin 3 & 4   |
   |--------------------+-------------------+-------------------|
   | CD normal          |       Open        |      Closed       |
   |--------------------+-------------------+-------------------|
   |>> CD forced high   |      Closed       |       Open        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CHASSIS TO SIGNAL GROUND                  |
   |------------------------------------------------------------|
   | Setting           |   JP5 Pin 1 & 2    |   JP5 Pin 3 & 4   |
   |-------------------+--------------------+-------------------|
   |>> Connected       |       Closed       |       Open        |
   |-------------------+--------------------+-------------------|
   | Disconnected      |        Open        |      Closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        CLOCK SOURCE                        |
   |------------------------------------------------------------|
   | Setting       |    JP1/A     |    JP1/B     |    JP1/C     |
   |---------------+--------------+--------------+--------------|
   |>> Internal    |    Closed    |     Open     |     Open     |
   |---------------+--------------+--------------+--------------|
   | External      |     Open     |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   | Receive       |     Open     |     Open     |    Closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     RECEIVE IMPEDANCE                      |
   |------------------------------------------------------------|
   | Setting          |   JP8 Pin 1 & 2    |   JP8 Pin 3 & 4    |
   |------------------+--------------------+--------------------|
   |>> 600 Ohms       |       Closed       |        Open        |
   |------------------+--------------------+--------------------|
   | High             |        Open        |       Closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      REMOTE LOOPBACK                       |
   |------------------------------------------------------------|
   | Setting                      |             JP4             |
   |------------------------------+-----------------------------|
   | SQ output                    |      Pins 1 & 2 closed      |
   |------------------------------+-----------------------------|
   |>> Remote loopback            |      Pins 2 & 3 closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SYNCHRONOUS/ASYNCHRONOUS SELECTOR              |
   |------------------------------------------------------------|
   | Setting                       |           SW2/S1           |
   |-------------------------------+----------------------------|
   |>> Synchronous                 |             On             |
   |-------------------------------+----------------------------|
   | Asynchronous                  |            Off             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     TRANSMISSION LEVEL                     |
   |------------------------------------------------------------|
   | Setting  |  JP6/A  |  JP6/B  |  JP6/C  |  JP6/D  |  JP6/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  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     TRANSMIT IMPEDANCE                     |
   |------------------------------------------------------------|
   | Setting          |   JP7 Pin 1 & 2    |   JP7 Pin 3 & 4    |
   |------------------+--------------------+--------------------|
   |>> 600 Ohms       |       Closed       |        Open        |
   |------------------+--------------------+--------------------|
   | Low              |        Open        |       Closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED  | Color  |  Status  |            Condition            |
   |------+--------+----------+---------------------------------|
   | PWR  | Green  |    On    |           Power is on           |
   |------+--------+----------+---------------------------------|
   | PWR  | Green  |   Off    |          Power is off           |
   |------+--------+----------+---------------------------------|
   | RTS  | Yellow |    On    |     Request to Send enabled     |
   |------+--------+----------+---------------------------------|
   | RTS  | Yellow |   Off    |    Request to Send disabled     |
   |------+--------+----------+---------------------------------|
   |  TD  | Yellow |    On    |  Modem is transmitting steady   |
   |      |        |          |              SPACE              |
   |------+--------+----------+---------------------------------|
   |  TD  | Yellow |   Off    | Modem is not transmitting data  |
   |------+--------+----------+---------------------------------|
   |  TD  | Yellow | Blinking |   Modem is transmitting data    |
   |------+--------+----------+---------------------------------|
   |  RD  | Yellow |    On    | Modem is receiving steady SPACE |
   |------+--------+----------+---------------------------------|
   |  RD  | Yellow |   Off    |   Modem is not receiving data   |
   |------+--------+----------+---------------------------------|
   |  RD  | Yellow | Blinking |     Modem is receiving data     |
   |------+--------+----------+---------------------------------|
   | DCD  | Yellow |    On    |     Carrier signal detected     |
   |------+--------+----------+---------------------------------|
   | DCD  | Yellow |   Off    |   Carrier signal not detected   |
   |------+--------+----------+---------------------------------|
   | TEST |  Red   |    On    |       Modem in test mode        |
   |------+--------+----------+---------------------------------|
   | TEST |  Red   |   Off    |     Modem not in test mode      |
   |------+--------+----------+---------------------------------|
   |  SQ  | Yellow |    On    |        Good line quality        |
   |------+--------+----------+---------------------------------|
   |  SQ  | Yellow | Blinking |        Poor line quality        |
   |------+--------+----------+---------------------------------|
   |  SQ  | Yellow |   Dim    |        PATT test failed         |
   +------------------------------------------------------------+