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       # SDL COMMUNICATIONS, INC.
       
          RISCOM/N2CSU
       
          Card Type              Serial/T1 CSU/DSU                       
          Chip Set               Hitachi HD64570                         
          Maximum Onboard Memory 256KB DRAM                              
          T1 Transfer Rate       1.554Mbps                               
          Data Bus               16-bit ISA                              
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Function | Label |            Function             | Label |
          |----------+-------+---------------------------------+-------|
          | T1 line  |  CN1  | RS-232, RS-422/449, RS-530, or  |  CN2  |
          |          |       | V.35 port                       |       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | » | Current ceiling enabled         |  J5   | Unidentified |
          |---+---------------------------------+-------+--------------|
          |   | Current ceiling disabled        |  J5   | Unidentified |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | S1/7  | Unidentified |
          |   | alter                           |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Factory configured - do not     | S1/8  | Unidentified |
          |   | alter                           |       |              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         INTERRUPT                          |
          |------------------------------------------------------------|
          |      J1 is used to set the interrupt. Exact settings are   |
          |      unidentified. Interrupts 3, 4, 5, 9, 10, 11, 12, and  |
          |      15 are available.                                     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      BASE I/O ADDRESS                      |
          |------------------------------------------------------------|
          |  Setting  | SW1/1  | SW1/2 | SW1/3 | SW1/4 | SW1/5 | SW1/6 |
          |-----------+--------+-------+-------+-------+-------+-------|
          |   | 100h  |   On   |  On   |  On   |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 110h  |  Off   |  On   |  On   |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 120h  |   On   |  Off  |  On   |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 130h  |  Off   |  Off  |  On   |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 140h  |   On   |  On   |  Off  |  On   |  Off  |  On   |
          |---+-------+--------+-------+-------+-------+-------+-------|
          | » | 300h  |   On   |  On   |  On   |  On   |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3B0h  |  Off   |  Off  |  On   |  Off  |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3C0h  |   On   |  On   |  Off  |  Off  |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3D0h  |  Off   |  On   |  Off  |  Off  |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3E0h  |   On   |  Off  |  Off  |  Off  |  Off  |  Off  |
          |---+-------+--------+-------+-------+-------+-------+-------|
          |   | 3F0h  |  Off   |  Off  |  Off  |  Off  |  Off  |  Off  |
          |------------------------------------------------------------|
          |      Note: A total of 48 base address settings are         |
          |      available. The switches are a binary representation   |
          |      of the decimal memory addresses. SW1/6 is the Most    |
          |      Significant Bit and switch SW1/1 is the Least         |
          |      Significant Bit. The switches have the following      |
          |      decimal values: SW1/6=512, SW1/5=256, SW1/4=128,      |
          |      SW1/3=64, SW1/2=32, SW1/1=16. Turn off the switches   |
          |      and add the values of the switches to obtain the      |
          |      correct memory address. (Off=1, On=0)                 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          | LED  | Color  |  Status  |            Condition            |
          |------+--------+----------+---------------------------------|
          | LED1 |  Red   |    On    |  Network connection is broken   |
          |------+--------+----------+---------------------------------|
          | LED1 |  Red   |   Off    |   Network connection is good    |
          |------+--------+----------+---------------------------------|
          | LED2 |  Red   |    On    |  Frame error has been detected  |
          |------+--------+----------+---------------------------------|
          | LED2 |  Red   |   Off    |    Frame error has not been     |
          |      |        |          |            detected             |
          |------+--------+----------+---------------------------------|
          | LED3 | Yellow |    On    |    Card is in loopback mode     |
          |------+--------+----------+---------------------------------|
          | LED3 | Yellow |   Off    |  Card is not in loopback mode   |
          |------+--------+----------+---------------------------------|
          | LED4 | Green  | Blinking |  Card processor is functioning  |
          |      |        |          |            normally             |
          |------+--------+----------+---------------------------------|
          | LED4 | Green  |   Off    |      Card processor is not      |
          |      |        |          |      functioning normally       |
          +------------------------------------------------------------+