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

[Image]

                                CONNECTIONS

        Function          Label             Function              Label

  T1 line                  CN1       RS-232, RS-422/449,           CN2
                                     RS-530, or V.35 port

                        USER CONFIGURABLE SETTINGS

                 Function                    Label         Position

  »   Current ceiling enabled                 J5         Unidentified

      Current ceiling disabled                J5         Unidentified

  »   Factory configured - do not alter      S1/7        Unidentified

  »   Factory configured - do not alter      S1/8        Unidentified

                                 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