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       # NATURAL MICROSYSTEMS
       
          VBX 200, VBX 400
       
          Card Type         Telephony                                    
          Chip Set          TI 320C10                                    
          Data Bus          16-bit ISA                                   
          I/O Options       Analog in/out, digital in/out, voice in/out  
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |       Function       | Label |      Function       | Label |
          |----------------------+-------+---------------------+-------|
          | Lines 1 & 2 out      |  J1   | Audio in/out        |  J4   |
          |----------------------+-------+---------------------+-------|
          | Lines 3 & 4 out      |  J2   | Analog/digital I/O  |  J5   |
          |                      |       | (see pinout below)  |       |
          |----------------------+-------+---------------------+-------|
          | Power and signalling |  J3   |                     |       |
          | (see pinout below)   |       |                     |       |
          |------------------------------------------------------------|
          | Note: Lines 2 & 3 are not present on model VBX 200.        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         J3 PINOUT                          |
          |------------------------------------------------------------|
          |       Function        | Pin  |       Function       | Pin  |
          |-----------------------+------+----------------------+------|
          | Channel 1 E signal    |  1   | Channel 3 SB signal  |  9   |
          |-----------------------+------+----------------------+------|
          | Channel 1 M signal    |  2   | Channel 4 E signal   |  10  |
          |-----------------------+------+----------------------+------|
          | Channel 1 SB signal   |  3   | Channel 4 M signal   |  11  |
          |-----------------------+------+----------------------+------|
          | Channel 2 E signal    |  4   | Channel 4 SB signal  |  12  |
          |-----------------------+------+----------------------+------|
          | Channel 2 M signal    |  5   | Battery ground       |  13  |
          |-----------------------+------+----------------------+------|
          | Channel 2 SB signal   |  6   | -48VDC battery       |  14  |
          |-----------------------+------+----------------------+------|
          | Channel 3 E signal    |  7   | -12V out             |  15  |
          |-----------------------+------+----------------------+------|
          | Channel 3 M signal    |  8   |                      |      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         J5 PINOUT                          |
          |------------------------------------------------------------|
          |        Function        | Pin |       Function        | Pin |
          |------------------------+-----+-----------------------+-----|
          | Analog channel 1       |  1  | Analog channel 3      | 11  |
          | in/out                 |     | in/out                |     |
          |------------------------+-----+-----------------------+-----|
          | Analog channel 2       |  2  | Analog channel 4      | 12  |
          | in/out                 |     | in/out                |     |
          |------------------------+-----+-----------------------+-----|
          | Digital channel 1 in   |  3  | Digital channel 3 in  | 13  |
          |------------------------+-----+-----------------------+-----|
          | Digital channel 2 in   |  4  | Digital channel 4 in  | 14  |
          |------------------------+-----+-----------------------+-----|
          | Digital channel 1 out  |  5  | Digital channel 3 out | 15  |
          |------------------------+-----+-----------------------+-----|
          | Digital channel 2 out  |  6  | Digital channel 4 out | 16  |
          |------------------------+-----+-----------------------+-----|
          | Not used               |  7  | Not used              | 17  |
          |------------------------+-----+-----------------------+-----|
          | Not used               |  8  | Not used              | 18  |
          |------------------------+-----+-----------------------+-----|
          | +12VDC power           |  9  | Digital signal ground | 19  |
          |------------------------+-----+-----------------------+-----|
          | -12VDC power           | 10  | Analog signal ground  | 20  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Setting               | Label |   Position   |
          |-------------------------------------+-------+--------------|
          | » | Interrupt driver enabled        |  W1   |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Interrupt driver disabled       |  W1   |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Direct audio path for port 1    |  A11  |     Open     |
          |   | enabled                         |       |              |
          |---+---------------------------------+-------+--------------|
          |   | Off-hook bypass for port 1      |  A11  |    Closed    |
          |   | enabled                         |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Direct audio path for port 2    |  A21  |     Open     |
          |   | enabled                         |       |              |
          |---+---------------------------------+-------+--------------|
          |   | Off-hook bypass for port 2      |  A21  |    Closed    |
          |   | enabled                         |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Direct audio path for port 3    |  A31  |     Open     |
          |   | enabled                         |       |              |
          |---+---------------------------------+-------+--------------|
          |   | Off-hook bypass for port 3      |  A31  |    Closed    |
          |   | enabled                         |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Direct audio path for port 4    |  A41  |     Open     |
          |   | enabled                         |       |              |
          |---+---------------------------------+-------+--------------|
          |   | Off-hook bypass for port 4      |  A41  |    Closed    |
          |   | enabled                         |       |              |
          |---+---------------------------------+-------+--------------|
          | » | Hook relay for port 1 enabled   |  A12  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Hook relay for port 1 disabled  |  A12  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Hook relay for port 2 enabled   |  A22  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Hook relay for port 2 disabled  |  A22  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Hook relay for port 3 enabled   |  A32  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Hook relay for port 3 disabled  |  A32  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Hook relay for port 4 enabled   |  A42  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Hook relay for port 4 disabled  |  A42  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Ring detect for port 1 enabled  |  A13  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Ring detect for port 1 disabled |  A13  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Ring detect for port 2 enabled  |  A23  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Ring detect for port 2 disabled |  A23  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Ring detect for port 3 enabled  |  A33  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Ring detect for port 3 disabled |  A33  |     Open     |
          |---+---------------------------------+-------+--------------|
          | » | Ring detect for port 4 enabled  |  A43  |    Closed    |
          |---+---------------------------------+-------+--------------|
          |   | Ring detect for port 4 disabled |  A43  |     Open     |
          |---+---------------------------------+-------+--------------|
          |   | Unidentified                    |  CF1  | Unidentified |
          |---+---------------------------------+-------+--------------|
          |   | Unidentified                    |  CF2  | Unidentified |
          |---+---------------------------------+-------+--------------|
          |   | Unidentified                    |  CF3  | Unidentified |
          |------------------------------------------------------------|
          |      Note: If multiple boards are installed in a system,   |
          |      only one board should have W1 closed.                 |
          +------------------------------------------------------------+
       
       +-----------------------------------------------------------------------+
       |                               LINE TYPE                               |
       |-----------------------------------------------------------------------|
       |Setting | A11  | A12  | A13  | A21  | A22  | A23  | A31  | A32  | A33  |
       |--------+------+------+------+------+------+------+------+------+------|
       |»| Loop | Open |Closed|Closed| Open |Closed|Closed| Open |Closed|Closed|
       | |Start |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |Ground| Open |Closed|Closed| Open |Closed|Closed| Open |Closed|Closed|
       | |Start |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | | DID  |Closed| Open | Open |Closed| Open | Open |Closed| Open | Open |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open |Closed| Open | Open |Closed| Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  1A  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open |Closed| Open | Open |Closed| Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  1B  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open |Closed| Open | Open |Closed| Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  2A  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open |Closed| Open | Open |Closed| Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  2B  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open |Closed| Open | Open |Closed| Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  4A  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open |Closed| Open | Open |Closed| Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  4B  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open |Closed| Open | Open |Closed| Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  5A  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open |Closed| Open | Open |Closed| Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  5B  |      |      |      |      |      |      |      |      |      |
       +-----------------------------------------------------------------------+
       
       +-----------------------------------------------------------------------+
       |                           LINE TYPE (CON’T)                           |
       |-----------------------------------------------------------------------|
       |Setting | A41  | A42  | A43  | B11  | B12  | B13  | B21  | B22  | B23  |
       |--------+------+------+------+------+------+------+------+------+------|
       |»| Loop | Open |Closed|Closed| Open | Open | Open | Open | Open | Open |
       | |Start |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |Ground| Open |Closed|Closed|Closed| Open |Closed|Closed| Open |Closed|
       | |Start |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | | DID  |Closed| Open | Open | Open | Open | Open | Open | Open | Open |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open | Open |Closed| Open | Open |Closed| Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  1A  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open | Open | Open | Open | Open | Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  1B  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open | Open |Closed| Open | Open |Closed| Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  2A  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open | Open | Open | Open | Open | Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  2B  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open | Open |Closed| Open | Open |Closed| Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  4A  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open | Open | Open | Open | Open | Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  4B  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open | Open |Closed| Open | Open |Closed| Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  5A  |      |      |      |      |      |      |      |      |      |
       |-+------+------+------+------+------+------+------+------+------+------|
       | |E & M |Closed| Open | Open | Open | Open | Open | Open | Open | Open |
       | | Type |      |      |      |      |      |      |      |      |      |
       | |  5B  |      |      |      |      |      |      |      |      |      |
       +-----------------------------------------------------------------------+
       
       +--------------------------------------------------------------------------+
       |                            LINE TYPE (CON’T)                             |
       |--------------------------------------------------------------------------|
       |Setting | B31  | B32  | B33  | B41  | B42  | B43  |  W9  | W13  | Battery |
       |--------+------+------+------+------+------+------+------+------+---------|
       |»| Loop | Open | Open | Open | Open | Open | Open |Closed|Closed|   Not   |
       | |Start |      |      |      |      |      |      |      |      |installed|
       |-+------+------+------+------+------+------+------+------+------+---------|
       | |Ground|Closed| Open |Closed|Closed| Open |Closed|Closed|Closed|   Not   |
       | |Start |      |      |      |      |      |      |      |      |installed|
       |-+------+------+------+------+------+------+------+------+------+---------|
       | | DID  | Open | Open | Open | Open | Open | Open | Open | Open |Installed|
       |-+------+------+------+------+------+------+------+------+------+---------|
       | |E & M | Open |Closed| Open | Open |Closed| Open |Closed|Closed|   Not   |
       | | Type |      |      |      |      |      |      |      |      |installed|
       | |  1A  |      |      |      |      |      |      |      |      |         |
       |-+------+------+------+------+------+------+------+------+------+---------|
       | |E & M | Open | Open | Open | Open | Open | Open |Closed|Closed|   Not   |
       | | Type |      |      |      |      |      |      |      |      |installed|
       | |  1B  |      |      |      |      |      |      |      |      |         |
       |-+------+------+------+------+------+------+------+------+------+---------|
       | |E & M | Open |Closed| Open | Open |Closed| Open |Closed|Closed|   Not   |
       | | Type |      |      |      |      |      |      |      |      |installed|
       | |  2A  |      |      |      |      |      |      |      |      |         |
       |-+------+------+------+------+------+------+------+------+------+---------|
       | |E & M | Open | Open | Open | Open | Open | Open |Closed|Closed|   Not   |
       | | Type |      |      |      |      |      |      |      |      |installed|
       | |  2B  |      |      |      |      |      |      |      |      |         |
       |-+------+------+------+------+------+------+------+------+------+---------|
       | |E & M | Open |Closed| Open | Open |Closed| Open |Closed|Closed|   Not   |
       | | Type |      |      |      |      |      |      |      |      |installed|
       | |  4A  |      |      |      |      |      |      |      |      |         |
       |-+------+------+------+------+------+------+------+------+------+---------|
       | |E & M | Open | Open | Open | Open | Open | Open |Closed|Closed|   Not   |
       | | Type |      |      |      |      |      |      |      |      |installed|
       | |  4B  |      |      |      |      |      |      |      |      |         |
       |-+------+------+------+------+------+------+------+------+------+---------|
       | |E & M | Open |Closed| Open | Open |Closed| Open |Closed|Closed|   Not   |
       | | Type |      |      |      |      |      |      |      |      |installed|
       | |  5A  |      |      |      |      |      |      |      |      |         |
       |-+------+------+------+------+------+------+------+------+------+---------|
       | |E & M | Open | Open | Open | Open | Open | Open |Closed|Closed|   Not   |
       | | Type |      |      |      |      |      |      |      |      |installed|
       | |  5B  |      |      |      |      |      |      |      |      |         |
       +--------------------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      BASE I/O ADDRESS                      |
          |------------------------------------------------------------|
          |     Setting     |    SW1/1     |    SW1/2    |    SW1/3    |
          |-----------------+--------------+-------------+-------------|
          |   |    100h     |     Off      |     Off     |     On      |
          |---+-------------+--------------+-------------+-------------|
          |   |    180h     |     Off      |     On      |     Off     |
          |---+-------------+--------------+-------------+-------------|
          |   |    1A0h     |      On      |     Off     |     Off     |
          |---+-------------+--------------+-------------+-------------|
          |   |    1C0h     |      On      |     On      |     Off     |
          |---+-------------+--------------+-------------+-------------|
          |   |    280h     |     Off      |     On      |     On      |
          |---+-------------+--------------+-------------+-------------|
          |   |    2A0h     |      On      |     Off     |     On      |
          |---+-------------+--------------+-------------+-------------|
          |   |    2C0h     |      On      |     On      |     On      |
          |---+-------------+--------------+-------------+-------------|
          | » |    340h     |     Off      |     Off     |     Off     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         INTERRUPT                          |
          |------------------------------------------------------------|
          |Setting |    W2     |  W3   |  W4   |  W5   |  W6   |  W7   |
          |--------+-----------+-------+-------+-------+-------+-------|
          |  |IRQ3 |   Open    |Closed | Open  | Open  | Open  | Open  |
          |--+-----+-----------+-------+-------+-------+-------+-------|
          |  |IRQ4 |   Open    | Open  |Closed | Open  | Open  | Open  |
          |--+-----+-----------+-------+-------+-------+-------+-------|
          |» |IRQ5 |   Open    | Open  | Open  |Closed | Open  | Open  |
          |--+-----+-----------+-------+-------+-------+-------+-------|
          |  |IRQ6 |   Open    | Open  | Open  | Open  |Closed | Open  |
          |--+-----+-----------+-------+-------+-------+-------+-------|
          |  |IRQ7 |   Open    | Open  | Open  | Open  | Open  |Closed |
          |--+-----+-----------+-------+-------+-------+-------+-------|
          |  |IRQ9 |  Closed   | Open  | Open  | Open  | Open  | Open  |
          |------------------------------------------------------------|
          |     Note: If multiple boards are installed in a system,    |
          |     assign them all the same IRQ.                          |
          +------------------------------------------------------------+