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                              

<gopher://bitreich.org/I/th99/t/S-T/52069-1.png>
   

   +------------------------------------------------------------+
   |                        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       |
   +------------------------------------------------------------+