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    HDLC, PPP                                   
   Protocol           
   Line Coding        2B1Q                                        
   Data Bus           External                                    

<gopher://bitreich.org/I/th99/t/A-B/55088-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |      Function       |   Label    |   Function    |  Label  |
   |------------------------------------------------------------|
   | Dedicated network port -     |   CN1   | V.35 DTE    | CN5 |
   | line 1                       |         | port        |     |
   |------------------------------+---------+-------------+-----|
   | Dial backup port - line 2    |   CN2   | Power       | CN6 |
   |------------------------------+---------+-------------+-----|
   | 25-pin DTE port - auxiliary  |   CN3   | Power       | SW1 |
   |                              |         | switch      |     |
   |------------------------------+---------+-------------+-----|
   | 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.                      |
   +------------------------------------------------------------+