ADTRAN

TSU 120

Card Type                 T1 DSU/CSU
Chip Set                  Unidentified
I/O Options               V.35 DTE port, T1 test jack - in, T1 test jack -
                          out, T1 test jack - monitor,

                          DTE test jack - in, DTE test jack - out, DTE test
                          jack - monitor,

                          RJ-48 control ports (2), T1 network interface via
                          RJ-48, power

                          DSX-1 DTE interface via RJ-48, Expansion module
T1 Data Rate              1.544Mbps
Line Coding               AMI, B8ZS, RZ, Bipolar
Framing                   D4, ESF
Data Bus                  External

[Image]

                                CONNECTIONS

         Function            Label            Function             Label

  T1 network port (RJ-48)     CN1      DSX-1 port (RJ-48)           CN8

  T1 test jack - in           CN2      Control port - chain in      CN9
                                       (RJ-48)

  T1 test jack - out          CN3      Control port - chain        CN10
                                       out (RJ-48)

       T1 test jack -         CN4      V.35 DTE port               CN11
       monitor

  DTE test jack - in          CN5      Power                       CN12

  DTE test jack - out         CN6      Power switch                 SW1

       DTE test jack -        CN7
       monitor

  Note:

  The optional expansion module may feature a switched 56K interface,
  voice interface, V.35,

  RS-232, or ISDN T1 interface

                             DIAGNOSTIC LED(S)

   LED        Color       Status                 Condition

   OK1        Green         On       DSU is operating in normal mode. No
                                         errors have been detected

   OK1        Green        Off      DSU is not in normal mode, or errors
                                             have been detected

   TST1       Yellow        On            DSU is conducting a test

   TST1       Yellow       Off          DSU is not conducting a test

   ALM1        Red          On      Alarm condition has been detected on
                                                    DSU

   ALM1        Red         Off      Alarm condition has not been detected
                                                   on DSU

   OK2        Green         On     Module is operating in normal mode. No
                                         errors have been detected

   OK2        Green        Off        Module is not in normal mode, or
                                         errors have been detected

   TST2       Yellow        On          Module is conducting a test

   TST2       Yellow       Off        Module is not conducting a test

   ALM2        Red          On      Alarm condition has been detected on
                                                option ports

   ALM2        Red         Off      Alarm condition has not been detected
                                              on option ports

   OK3        Green         On       CSU is operating in normal mode. No
                                         errors have been detected

   OK3        Green        Off      CSU is not in normal mode, or errors
                                             have been detected

   TST3       Yellow        On            CSU is conducting a test

   TST3       Yellow       Off          CSU is not conducting a test

   ERR         Red          On       Error has been detected on network.
                                      Errors include: BPV, OOF or CRC

   ERR         Red         Off     Error has not been detected on network

   ALM3        Red          On      Alarm condition has been detected on
                                                  network

   ALM3        Red         Off      Alarm condition has not been detected
                                                 on network