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

[Image]

                                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 disabled         SW2/11          On

      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