MULTI-TECH SYSTEMS, INC.
========================

   MT56DSU2

   Card Type              DSU/CSU (synchronous/asynchronous)      
   Transfer Rates         56Kbps/19.2Kbps/9600bps/4800bps/2400bps 
   Data Bus               External                                
   Data Modulation        DDS                                     
   Protocol               
   Topology               Star/Peer-Peer                          

<gopher://bitreich.org/I/th99/t/M-O/51882-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |       Function        | Label |      Function      | Label |
   |-----------------------+-------+--------------------+-------|
   | RS-232 port           |  CN1  | V.35 port          |  CN4  |
   |-----------------------+-------+--------------------+-------|
   | DC power              |  CN2  | Power switch       |  SW1  |
   |-----------------------+-------+--------------------+-------|
   | RJ-48 line out        |  CN3  |                    |       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                Setting                 | Label  | Position |
   |----------------------------------------+--------+----------|
   |>> | RTS forced high                    | SW2/6  |   Off    |
   |---+------------------------------------+--------+----------|
   |   | RTS normal                         | SW2/6  |    On    |
   |---+------------------------------------+--------+----------|
   |>> | DSR forced high                    | SW2/7  |   Off    |
   |---+------------------------------------+--------+----------|
   |   | DSR normal                         | SW2/7  |    On    |
   |---+------------------------------------+--------+----------|
   |>> | Synchronous mode                   | SW2/8  |    On    |
   |---+------------------------------------+--------+----------|
   |   | Asynchronous mode                  | SW2/8  |   Off    |
   |---+------------------------------------+--------+----------|
   |>> | Loopback test mode disabled        | SW2/9  |    On    |
   |---+------------------------------------+--------+----------|
   |   | Loopback test mode enabled         | SW2/9  |   Off    |
   |---+------------------------------------+--------+----------|
   |>> | Test pattern mode disabled         | SW2/10 |    On    |
   |---+------------------------------------+--------+----------|
   |   | Test pattern mode enabled          | SW2/10 |   Off    |
   |---+------------------------------------+--------+----------|
   |>> | Circuit assurance function         | SW2/11 |    On    |
   |   | disabled                           |        |          |
   |---+------------------------------------+--------+----------|
   |   | Circuit assurance function enabled | SW2/11 |   Off    |
   |---+------------------------------------+--------+----------|
   |>> | System status function disabled    | SW2/12 |    On    |
   |---+------------------------------------+--------+----------|
   |   | System status function enabled     | SW2/12 |   Off    |
   |---+------------------------------------+--------+----------|
   |>> | Elastic store function disabled    | SW3/3  |    On    |
   |---+------------------------------------+--------+----------|
   |   | Elastic store function enabled     | SW3/3  |   Off    |
   |---+------------------------------------+--------+----------|
   |>> | Anti-streaming function disabled   | SW3/4  |   Off    |
   |---+------------------------------------+--------+----------|
   |   | Anti-streaming function enabled    | SW3/4  |    On    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                ASYNCHRONOUS MODE BIT LENGTH                |
   |------------------------------------------------------------|
   |        Setting         |      SW3/1      |      SW3/2      |
   |------------------------+-----------------+-----------------|
   |    |       9-bit       |       On        |       Off       |
   |----+-------------------+-----------------+-----------------|
   |>>  |      10-bit       |       Off       |       On        |
   |----+-------------------+-----------------+-----------------|
   |    |      11-bit       |       On        |       On        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        CLOCK SOURCE                        |
   |------------------------------------------------------------|
   |         Setting         |      SW2/4      |     SW2/5      |
   |-------------------------+-----------------+----------------|
   |   |      Internal       |       On        |       On       |
   |---+---------------------+-----------------+----------------|
   |   |      External       |       Off       |      Off       |
   |---+---------------------+-----------------+----------------|
   |>> |  From DDS network   |       Off       |       On       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     TRANSMISSION RATE                      |
   |------------------------------------------------------------|
   |      Setting      |    SW2/1    |    SW2/2    |   SW2/3    |
   |-------------------+-------------+-------------+------------|
   |   |    2400bps    |     Off     |     Off     |    Off     |
   |---+---------------+-------------+-------------+------------|
   |   |    4800bps    |     Off     |     On      |    Off     |
   |---+---------------+-------------+-------------+------------|
   |   |    9600bps    |     Off     |     Off     |     On     |
   |---+---------------+-------------+-------------+------------|
   |   |   19.2Kbps    |     Off     |     On      |     On     |
   |---+---------------+-------------+-------------+------------|
   |>> |    56Kbps     |     On      |     On      |     On     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED  | Color |  Status  |            Condition             |
   |------+-------+----------+----------------------------------|
   |  SD  |  Red  |    On    |     DSU is transmitting data     |
   |------+-------+----------+----------------------------------|
   |  SD  |  Red  |   Off    |   DSU is not transmitting data   |
   |------+-------+----------+----------------------------------|
   |  RD  |  Red  |    On    |      DSU is receiving data       |
   |------+-------+----------+----------------------------------|
   |  RD  |  Red  |   Off    |    DSU is not receiving data     |
   |------+-------+----------+----------------------------------|
   |  CD  |  Red  |    On    |     Carrier signal detected      |
   |------+-------+----------+----------------------------------|
   |  CD  |  Red  |   Off    |   Carrier signal not detected    |
   |------+-------+----------+----------------------------------|
   |  56  |  Red  |    On    |     DSU connected at 56Kbps      |
   |------+-------+----------+----------------------------------|
   |  56  |  Red  |   Off    |   DSU not connected at 56Kbps    |
   |------+-------+----------+----------------------------------|
   | 19.2 |  Red  |    On    |    DSU connected at 19.2Kbps     |
   |------+-------+----------+----------------------------------|
   | 19.2 |  Red  |   Off    |  DSU not connected at 19.2Kbps   |
   |------+-------+----------+----------------------------------|
   |  96  |  Red  |    On    |     DSU connected at 9600bps     |
   |------+-------+----------+----------------------------------|
   |  96  |  Red  |   Off    |   DSU not connected at 9600bps   |
   |------+-------+----------+----------------------------------|
   |  48  |  Red  |    On    |     DSU connected at 4800bps     |
   |------+-------+----------+----------------------------------|
   |  48  |  Red  |   Off    |   DSU not connected at 4800bps   |
   |------+-------+----------+----------------------------------|
   | CTS  |  Red  |    On    |        CTS signal is high        |
   |------+-------+----------+----------------------------------|
   | CTS  |  Red  |   Off    |        CTS signal is low         |
   |------+-------+----------+----------------------------------|
   | RTS  |  Red  |    On    |        RTS signal is high        |
   |------+-------+----------+----------------------------------|
   | RTS  |  Red  |   Off    |        RTS signal is low         |
   |------+-------+----------+----------------------------------|
   |  NS  |  Red  |    On    |     DDS signal not detected      |
   |------+-------+----------+----------------------------------|
   |  NS  |  Red  |   Off    |       DDS signal detected        |
   |------+-------+----------+----------------------------------|
   |  NS  |  Red  | Blinking | Errors detected in test pattern  |
   |------+-------+----------+----------------------------------|
   | OOS  |  Red  |    On    |    DDS network out-of-service    |
   |      |       |          |        condition detected        |
   |------+-------+----------+----------------------------------|
   | OOS  |  Red  |   Off    |    DDS network out-of-service    |
   |      |       |          |      condition not detected      |
   |------+-------+----------+----------------------------------|
   |  TM  |  Red  |    On    |       DSU is in test mode        |
   |------+-------+----------+----------------------------------|
   |  TM  |  Red  |   Off    |     DSU is not in test mode      |
   +------------------------------------------------------------+