ADTRAN

DSU III DBU

Card Type                   Dial Backup DSU
Chip Set                    Unidentified
I/O Options                 25-pin DTE ports (2), V.35 DTE port, dial
                            backup port (RJ-48), dedicated network port
                            (RJ-48), power
Maximum Data Rate           64Kbps
ISDN Rate                   64Kbps
ISDN Modulation Protocol    HDLC, PPP
Line Coding                 2B1Q
Data Bus                    External

[Image]

                                CONNECTIONS

        Function           Label             Function              Label

  Dedicated network port -       CN1       V.35 DTE port            CN5
  line 1

  Dial backup port - line 2      CN2       Power                    CN6

  25-pin DTE port -              CN3       Power switch             SW1
  auxiliary

  25-pin DTE port - primary      CN4

                                         DIAGNOSTIC LED(S)

  LED        Color       Status                              Condition

   RS     Unidentified    On                              RTS signal high

   RS     Unidentified    Off                             RTS signal low

   CS     Unidentified    On                              CTS signal high

   CS     Unidentified    Off                             CTS signal low

   TD     Unidentified    On                    Data is being transmitting from DTE

   TD     Unidentified    Off                 Data is not being transmitting from DTE

   RD     Unidentified    On                    Data is being received from network

   RD     Unidentified    Off                 Data is not being received from network

   CD     Unidentified    On          Frame synchronization is established. Device is ready to
                                                       transmit/receive data

   CD     Unidentified    Off     Frame synchronization is not established. Device is not ready to
                                                       transmit/receive data

  ALM     Unidentified    On       Open loop, loss of frame synchronization, dial backup mode, or
                                     problem with dial backup line alarm condition detected on
                                                              network

  ALM     Unidentified    Off      Open loop, loss of frame synchronization, dial backup mode, or
                                   problem with dial backup line alarm condition not detected on
                                                              network

  TST     Unidentified    On                        Device is conducting a test

  TST     Unidentified    Off                     Device is not conducting a test

                   SUPPORTED COMMAND SET

                     Basic AT Commands

  AT, A/

  A, E, H, O, Q, V

  &C, &D, &F, &K, &L, &Q, &R, &S, &V,&X, &Z

                   Extended AT Commands

  \N, \T

  %A, %C,



  Note: See MHI Help File for full command documentation.

                         NON-STANDARD COMMAND SET

                             Basic AT Commands

  Z

                           Extended AT Commands

  %B, %K, %P, %P=x, %P>x, %R, %T

  _A, _B, _C, _D, _E, _F, _G, _H, _I, _J, _K, _L, _N=xx, _P, _RR, _S=x,
  _T, _X, _Y



  Note: Full documentation is unavailable for non-standard AT commands

                               TEST COMMANDS

                                TEST MODES

  Type:          Immediate

  Format:        AT [cmds] &Tn

  Description:   Selects test options

    Command                              Function

      &T0        End current test

      &T1        Begin local analog loopback test

      &T3        Begin local digital loopback

      &T6        Request remote digital loopback

      &T7        Request remote digital loopback and self-test

      &T8        Begin local analog loopback and self-test

      &T9        Begin local self-test

      &T10       Begin local DTE and anolog loopback test

      &T11       Begin local analog loopback test

                               TEST PATTERNS

  Type:               Immediate

  Format:             AT [cmds] _Tn

  Description:        Selects test pattern options

      Command                              Function

        _T0           Begin test using 2047 pattern

        _T1           Begin test using 511 pattern

        _T2           Begin stress test using pattern #1

        _T3           Begin stress test using pattern #2

        _T4           Begin stress test using pattern #3

        _T5           Begin stress test using pattern #4

  Note: Commands must be used in conjuction with T7 or T8 to select
  analog or remote test pattern.