ASTROCOM CORPORATION

NX1

Card Type        T1 CSU/DSU
Chipset          Unidentified
T1 Transfer Rate 56Kbps x 24/64Kbps x 24
T1 Protocol      AMI, B8ZS
Frame Type       D4, SF, ESF
Data Bus         Serial

[Image]

                                CONNECTIONS

        Function           Label             Function             Label

  LEFT button               BT1      T1 line out (Network          CN3
                                     Interface)

  ENTER button              BT2      T1 line in (Terminal          CN4
                                     Interface)

  RIGHT button              BT3      Serial control port           CN5

  AC power in               CN1      LCD display                   LCD

  V.35, RS-422, or          CN2      Power switch                  SW1
  RS-449 serial data
  port

            Note:The type of serial port CN2 is determined by which
            daughtercard is installed in the unit. No further information
            about the daughtercard is available.

                             DIAGNOSTIC LED(S)

    LED            Color           Status              Condition

    RED        Unidentified          On         T1 signal has been out of
                                                 frame for more than 2.5
                                                        seconds

    RED        Unidentified          Off       T1 signal has not been out
                                               of frame for more than 2.5
                                                        seconds

    YEL        Unidentified          On            Yellow alarm signal
                                                        detected

    YEL        Unidentified          Off         Yellow alarm signal not
                                                        detected

    AIS        Unidentified          On         All Ones Signal detected

    AIS        Unidentified          Off           All Ones Signal not
                                                        detected

    LOS        Unidentified          On         Loss of Signal condition
                                                 detected for more than
                                                         150ms

    LOS        Unidentified          Off        Loss of Signal condition
                                               not detected for more than
                                                         150ms

    SES        Unidentified          On         Large quantity of errors
                                                  detected in the last
                                                         second

    SES        Unidentified          Off        Small quantity of errors
                                                  detected in the last
                                                         second

                         DIAGNOSTIC LED(S) (CON'T)

    LED            Color           Status              Condition

    T1A         Unidentified         On         Valid signal detected on
                                                  T1 network interface

    T1A         Unidentified         Off        Valid signal not detected
                                                on T1 network interface

    DTEA        Unidentified         On         Valid signal detected at
                                                          DTE

    DTEA        Unidentified         Off        Valid signal not detected
                                                         at DTE

    DS1A        Unidentified         On         Valid signal detected on
                                                 T1 terminal interface

    DS1A        Unidentified         Off        Valid signal not detected
                                                on T1 terminal interface

    T1B         Unidentified         On          T1 network interface in
                                                       test mode

    T1B         Unidentified         Off        T1 network interface not
                                                      in test mode

    DTEB        Unidentified         On             DTE in test mode

    DTEB        Unidentified         Off          DTE not in test mode

    DS1B        Unidentified         On         T1 terminal interface in
                                                       test mode

    DS1B        Unidentified         Off        T1 terminal interface not
                                                      in test mode