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

   FOM-40

   Modem Type               Data (synchronous)                    
   Maximum Data Rate        2048Kbps                              
   Data Bus                 External                              
   Data Modulation Protocol Proprietary                           

<gopher://bitreich.org/I/th99/t/P-R/51528-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |    Purpose     | Location |       Purpose       | Location |
   |----------------+----------+---------------------+----------|
   | X.21/G.703     |   CN1    | Digital loopback    |   DIG    |
   |                |          | switch              |          |
   |----------------+----------+---------------------+----------|
   | AC/DC power    |   CN2    | Analog loopback     |   ANA    |
   |                |          | switch              |          |
   |----------------+----------+---------------------+----------|
   | Receive fiber  |    RX    | Remote loopback     |   REM    |
   |                |          | switch              |          |
   |----------------+----------+---------------------+----------|
   | Transmit fiber |    TX    | Test pattern        |   PATT   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      ANALOG LOOPBACK                       |
   |------------------------------------------------------------|
   | Setting                    |              JP6              |
   |----------------------------+-------------------------------|
   | Enabled                    |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |>> Disabled                 |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         BAUD RATE                          |
   |------------------------------------------------------------|
   | Setting                       |            SW1             |
   |-------------------------------+----------------------------|
   | 1.544Mbps                     |             0              |
   |-------------------------------+----------------------------|
   | 1.536Mbps                     |             1              |
   |-------------------------------+----------------------------|
   | 768Kbps                       |             2              |
   |-------------------------------+----------------------------|
   | 384Kbps                       |             3              |
   |-------------------------------+----------------------------|
   | 2.048Mbps                     |             4              |
   |-------------------------------+----------------------------|
   | 1.024Mbps                     |             5              |
   |-------------------------------+----------------------------|
   | 512Kbps                       |             6              |
   |-------------------------------+----------------------------|
   | 256Kbps                       |             7              |
   |-------------------------------+----------------------------|
   | 128Kbps                       |             8              |
   |-------------------------------+----------------------------|
   |>> 64Kbps                      |             9              |
   |-------------------------------+----------------------------|
   | 112Kbps                       |             A              |
   |-------------------------------+----------------------------|
   | 56Kbps                        |             B              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         CD SIGNAL                          |
   |------------------------------------------------------------|
   | Setting                     |             JP2              |
   |-----------------------------+------------------------------|
   |>> CD forced high            |       Pins 1 &2 closed       |
   |-----------------------------+------------------------------|
   | CD normal                   |      Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CHASSIS TO SIGNAL GROUND                  |
   |------------------------------------------------------------|
   | Setting                    |              JP5              |
   |----------------------------+-------------------------------|
   |>> Connected                |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   | Disconnected               |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

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

   +------------------------------------------------------------+
   |                           RANGE                            |
   |------------------------------------------------------------|
   | Setting                    |              JP3              |
   |----------------------------+-------------------------------|
   | Long                       |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |>> Short                    |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      REMOTE LOOPBACK                       |
   |------------------------------------------------------------|
   | Setting                    |              JP7              |
   |----------------------------+-------------------------------|
   | Enabled                    |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |>> Disabled                 |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         V.54 DELAY                         |
   |------------------------------------------------------------|
   | Setting                    |              JP4              |
   |----------------------------+-------------------------------|
   |>> NO                       |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   | YES                        |       Pins 2 & 3 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      |
   |------+--------+----------+---------------------------------|
   | ERR  | Yellow |    On    |     Errors in test pattern      |
   |------+--------+----------+---------------------------------|
   | ERR  | Yellow |   Off    |        Good test pattern        |
   +------------------------------------------------------------+