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       # NATURAL MICROSYSTEMS CORPORATION
       
          DTI-48 REV. 1.1
       
          Card Type               T1 DSU                                 
          Chip Set                TI TMS320C51                           
          Processor Type          80376 (exact location is unidentified) 
          Processor Speed         Unidentified                           
          I/O options             MVIP bus                               
          Maximum Data Rate       1.544Mbps x 2, 64Kbps x 48             
          Data Bus                16-bit ISA                             
          Data Modulation         B8ZS                                   
          Protocol                
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |      Function      | Label |       Function        | Label |
          |--------------------+-------+-----------------------+-------|
          | Line 1 out         |  J1   | Audio handset         |  J3   |
          |--------------------+-------+-----------------------+-------|
          | Line 2 out         |  J2   | MVIP bus              |  J4   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |                 Setting                 | Label | Position |
          |-----------------------------------------+-------+----------|
          | » | T1 line 1 wave shape normal         |  W2   |  Closed  |
          |---+-------------------------------------+-------+----------|
          |   | T1 line 1 wave shape altered        |  W2   |   Open   |
          |---+-------------------------------------+-------+----------|
          | » | T1 line 2 wave shape normal         |  W3   |  Closed  |
          |---+-------------------------------------+-------+----------|
          |   | T1 line 2 wave shape altered        |  W3   |   Open   |
          |---+-------------------------------------+-------+----------|
          | » | Factory configured - do not alter   | SW2/8 |   Off    |
          |---+-------------------------------------+-------+----------|
          | » | Factory configured - do not alter   | SW3/8 |   Off    |
          |---+-------------------------------------+-------+----------|
          | » | Factory configured - do not alter   | P2/E  |   Open   |
          |---+-------------------------------------+-------+----------|
          | » | Factory configured - do not alter   | P2/F  |   Open   |
          |---+-------------------------------------+-------+----------|
          | » | Factory configured - do not alter   |  P4   |   Open   |
          |---+-------------------------------------+-------+----------|
          | » | Factory configured - do not alter   |  P6   |   Open   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      BASE I/O ADDRESS                      |
          |------------------------------------------------------------|
          |    Setting     |   S3/1   |   S3/2   |   S3/3   |   S3/4   |
          |----------------+----------+----------+----------+----------|
          |   |    200h    |    On    |    On    |    On    |   Off    |
          |---+------------+----------+----------+----------+----------|
          | » |    300h    |    On    |    On    |    On    |    On    |
          |---+------------+----------+----------+----------+----------|
          |   |   2200h    |    On    |    On    |   Off    |   Off    |
          |---+------------+----------+----------+----------+----------|
          |   |   2300h    |    On    |    On    |   Off    |    On    |
          |---+------------+----------+----------+----------+----------|
          |   |   4200h    |    On    |   Off    |    On    |   Off    |
          |---+------------+----------+----------+----------+----------|
          |   |   4300h    |    On    |   Off    |    On    |    On    |
          |---+------------+----------+----------+----------+----------|
          |   |   6200h    |    On    |   Off    |   Off    |   Off    |
          |---+------------+----------+----------+----------+----------|
          |   |   6300h    |    On    |   Off    |   Off    |    On    |
          |---+------------+----------+----------+----------+----------|
          |   |   8200h    |   Off    |    On    |    On    |   Off    |
          |---+------------+----------+----------+----------+----------|
          |   |   8300h    |   Off    |    On    |    On    |    On    |
          |---+------------+----------+----------+----------+----------|
          |   |   A200h    |   Off    |    On    |   Off    |   Off    |
          |---+------------+----------+----------+----------+----------|
          |   |   A300h    |   Off    |    On    |   Off    |    On    |
          |---+------------+----------+----------+----------+----------|
          |   |   C200h    |   Off    |   Off    |    On    |   Off    |
          |---+------------+----------+----------+----------+----------|
          |   |   C300h    |   Off    |   Off    |    On    |    On    |
          |---+------------+----------+----------+----------+----------|
          |   |   E200h    |   Off    |   Off    |   Off    |   Off    |
          |---+------------+----------+----------+----------+----------|
          |   |   E300h    |   Off    |   Off    |   Off    |    On    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CABLE LENGTH - LINE 1                    |
          |------------------------------------------------------------|
          |  Setting  | S4/1 | S4/2 | S4/3 | S4/4 | S4/5 | S4/6 | S4/7 |
          |-----------+------+------+------+------+------+------+------|
          |  0’-150’  |  On  | Off  | Off  | Off  | Off  | Off  | Off  |
          |-----------+------+------+------+------+------+------+------|
          | 150’-450’ | Off  |  On  | Off  |  On  | Off  |  On  | Off  |
          |-----------+------+------+------+------+------+------+------|
          | 450’-655’ | Off  | Off  |  On  | Off  |  On  | Off  |  On  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CABLE LENGTH - LINE 2                    |
          |------------------------------------------------------------|
          |  Setting  | S2/1 | S2/2 | S2/3 | S2/4 | S2/5 | S2/6 | S2/7 |
          |-----------+------+------+------+------+------+------+------|
          |  0’-150’  |  On  | Off  | Off  | Off  | Off  | Off  | Off  |
          |-----------+------+------+------+------+------+------+------|
          | 150’-450’ | Off  |  On  | Off  |  On  | Off  |  On  | Off  |
          |-----------+------+------+------+------+------+------+------|
          | 450’-655’ | Off  | Off  |  On  | Off  |  On  | Off  |  On  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   T1 DIRECTION - LINE 1                    |
          |------------------------------------------------------------|
          |          Setting           |              P9               |
          |----------------------------+-------------------------------|
          | » |         Normal         |   Pins 1 & 2, 3 & 4 closed    |
          |---+------------------------+-------------------------------|
          |   |        Reversed        |   Pins 1 & 3, 2 & 4 closed    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   T1 DIRECTION - LINE 2                    |
          |------------------------------------------------------------|
          |          Setting           |              P11              |
          |----------------------------+-------------------------------|
          | » |         Normal         |   Pins 1 & 2, 3 & 4 closed    |
          |---+------------------------+-------------------------------|
          |   |        Reversed        |   Pins 1 & 3, 2 & 4 closed    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    MVIP BUS TERMINATION                    |
          |------------------------------------------------------------|
          |      Setting       |  P2/A   |  P2/B   |  P2/C   |  P2/D   |
          |--------------------+---------+---------+---------+---------|
          | » |   Terminated   | Closed  | Closed  | Closed  | Closed  |
          |---+----------------+---------+---------+---------+---------|
          |   | Not terminated |  Open   |  Open   |  Open   |  Open   |
          +------------------------------------------------------------+