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       # CTC UNION TECHNOLOGIES CO., LTD
       
          G.703 FE1 FRACTIONAL E1
       
          G.703 FRACTIONAL T1
       
          Card Type           Fractional Access Unit                     
          NIC Type            E1/T1                                      
          Chip Set            Unidentified                               
          I/O Options         25-pin DTE/DCE port, BNC connectors (2),   
                                                                         
                              RJ-45 connector                            
          Wiring Type         RJ-45 120ohm shielded twisted pair         
                                                                         
                              BNC 75ohm coaxial                          
          Maximum Data Rate   2048Kbps                                   
          Data Bus            External                                   
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |     Function     | Label |        Function         | Label |
          |------------------+-------+-------------------------+-------|
          | RJ-45 connector  |  CN1  | BNC connector -         |  TX   |
          |                  |       | transmit                |       |
          |------------------+-------+-------------------------+-------|
          | 25-pin serial    |  CN2  | Power switch            |  SW8  |
          | connector        |       |                         |       |
          |------------------+-------+-------------------------+-------|
          | BNC connector -  |  RX   |                         |       |
          | receive          |       |                         |       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |                 Setting                 | Label | Position |
          |-----------------------------------------+-------+----------|
          | » | Unframe mode enabled                | SW2/1 |   Off    |
          |---+-------------------------------------+-------+----------|
          |   | Frame mode enabled                  | SW2/1 |    On    |
          |---+-------------------------------------+-------+----------|
          | » | Normal clock polarity - receive     | SW6/3 |   Off    |
          |---+-------------------------------------+-------+----------|
          |   | Inverted clock polarity - receive   | SW6/3 |    On    |
          |---+-------------------------------------+-------+----------|
          | » | Normal clock polarity - transmit    | SW6/4 |   Off    |
          |---+-------------------------------------+-------+----------|
          |   | Inverted clock polarity - transmit  | SW6/4 |    On    |
          |---+-------------------------------------+-------+----------|
          | » | CRC4 disabled                       | SW6/5 |   Off    |
          |---+-------------------------------------+-------+----------|
          |   | CRC4 enabled                        | SW6/5 |    On    |
          |---+-------------------------------------+-------+----------|
          | » | CAS/PCM30 mode                      | SW6/6 |   Off    |
          |---+-------------------------------------+-------+----------|
          |   | CAS/PCM31 mode                      | SW6/6 |    On    |
          |---+-------------------------------------+-------+----------|
          | » | Unused timeslot - Mark              | SW6/7 |   Off    |
          |---+-------------------------------------+-------+----------|
          |   | Unused timeslot - Pass-through      | SW6/7 |    On    |
          |---+-------------------------------------+-------+----------|
          | » | DCE data port enabled               | SW6/8 |   Off    |
          |---+-------------------------------------+-------+----------|
          |   | DTE data port enabled               | SW6/8 |    On    |
          |------------------------------------------------------------|
          | Note: When cascading, SW6/7 must be set to on.             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       LINE IMPEDANCE                       |
          |------------------------------------------------------------|
          |      Setting       | SW1/1 | SW1/2 | SW1/3 | SW1/4 | SW1/5 |
          |--------------------+-------+-------+-------+-------+-------|
          | » | 75ohm          |  Off  |  Off  |  On   |  On   |  On   |
          |   | unbalanced     |       |       |       |       |       |
          |   | network        |       |       |       |       |       |
          |   | interface      |       |       |       |       |       |
          |---+----------------+-------+-------+-------+-------+-------|
          |   | 120ohm         |  On   |  On   |  Off  |  Off  |  Off  |
          |   | balanced       |       |       |       |       |       |
          |   | network        |       |       |       |       |       |
          |   | interface      |       |       |       |       |       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     TIMESLOT SELECTION                     |
          |------------------------------------------------------------|
          |  Setting  |SW2/2 |SW2/3 |SW2/4 |SW2/5 |SW2/6 |SW2/7 |SW2/8 |
          |-----------+------+------+------+------+------+------+------|
          |Timeslot 1 |  On  | Off  | Off  | Off  | Off  | Off  | Off  |
          |active     |      |      |      |      |      |      |      |
          |-----------+------+------+------+------+------+------+------|
          |Timeslot 2 | Off  |  On  | Off  | Off  | Off  | Off  | Off  |
          |active     |      |      |      |      |      |      |      |
          |-----------+------+------+------+------+------+------+------|
          |Timeslot 3 | Off  | Off  |  On  | Off  | Off  | Off  | Off  |
          |active     |      |      |      |      |      |      |      |
          |-----------+------+------+------+------+------+------+------|
          |Timeslot 4 | Off  | Off  | Off  |  On  | Off  | Off  | Off  |
          |active     |      |      |      |      |      |      |      |
          |-----------+------+------+------+------+------+------+------|
          |Timeslot 5 | Off  | Off  | Off  | Off  |  On  | Off  | Off  |
          |active     |      |      |      |      |      |      |      |
          |-----------+------+------+------+------+------+------+------|
          |Timeslot 6 | Off  | Off  | Off  | Off  | Off  |  On  | Off  |
          |active     |      |      |      |      |      |      |      |
          |-----------+------+------+------+------+------+------+------|
          |Timeslot 7 | Off  | Off  | Off  | Off  | Off  | Off  |  On  |
          |active     |      |      |      |      |      |      |      |
          |------------------------------------------------------------|
          |Note: Off position sets timeslots to idle. Cascaded units   |
          |must not be assigned identical or overlapping timeslots     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 TIMESLOT SELECTION (CONT.)                 |
          |------------------------------------------------------------|
          | Setting |SW3/1|SW3/2 |SW3/3 |SW3/4 |SW3/5|SW3/6|SW3/7|SW3/8|
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | On  | Off  | Off  | Off  | Off | Off | Off | Off |
          |8 active |     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off |  On  | Off  | Off  | Off | Off | Off | Off |
          |9 active |     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  |  On  | Off  | Off | Off | Off | Off |
          |10 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  |  On  | Off | Off | Off | Off |
          |11 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | On  | Off | Off | Off |
          |12 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | Off | On  | Off | Off |
          |13 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | Off | Off | On  | Off |
          |14 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | Off | Off | Off | On  |
          |15 active|     |      |      |      |     |     |     |     |
          |------------------------------------------------------------|
          |Note: Off position sets timeslots to idle. Cascaded units   |
          |must not be assigned identical or overlapping timeslots     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 TIMESLOT SELECTION (CONT.)                 |
          |------------------------------------------------------------|
          | Setting |SW4/1|SW4/2 |SW4/3 |SW4/4 |SW4/5|SW4/6|SW4/7|SW4/8|
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | On  | Off  | Off  | Off  | Off | Off | Off | Off |
          |16 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off |  On  | Off  | Off  | Off | Off | Off | Off |
          |17 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  |  On  | Off  | Off | Off | Off | Off |
          |18 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  |  On  | Off | Off | Off | Off |
          |19 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | On  | Off | Off | Off |
          |20 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | Off | On  | Off | Off |
          |21 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | Off | Off | On  | Off |
          |22 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | Off | Off | Off | On  |
          |23 active|     |      |      |      |     |     |     |     |
          |------------------------------------------------------------|
          |Note: Off position sets timeslots to idle. Cascaded units   |
          |must not be assigned identical or overlapping timeslots     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 TIMESLOT SELECTION (CONT.)                 |
          |------------------------------------------------------------|
          | Setting |SW5/1|SW5/2 |SW5/3 |SW5/4 |SW5/5|SW5/6|SW5/7|SW5/8|
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | On  | Off  | Off  | Off  | Off | Off | Off | Off |
          |24 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off |  On  | Off  | Off  | Off | Off | Off | Off |
          |25 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  |  On  | Off  | Off | Off | Off | Off |
          |26 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  |  On  | Off | Off | Off | Off |
          |27 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | On  | Off | Off | Off |
          |28 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | Off | On  | Off | Off |
          |29 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | Off | Off | On  | Off |
          |30 active|     |      |      |      |     |     |     |     |
          |---------+-----+------+------+------+-----+-----+-----+-----|
          |Timeslot | Off | Off  | Off  | Off  | Off | Off | Off | On  |
          |31 active|     |      |      |      |     |     |     |     |
          |------------------------------------------------------------|
          |Note: Off position sets timeslots to idle. Cascaded units   |
          |must not be assigned identical or overlapping timeslots     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       TIMING SOURCE                        |
          |------------------------------------------------------------|
          |                  Setting                   | SW6/1 | SW6/2 |
          |--------------------------------------------+-------+-------|
          | » | Receive - recovery/transmit - data     |  Off  |  Off  |
          |   | port                                   |       |       |
          |---+----------------------------------------+-------+-------|
          |   | Receive/transmit - data port           |  Off  |  On   |
          |---+----------------------------------------+-------+-------|
          |   | Receive/transmit - recovery            |  On   |  Off  |
          |---+----------------------------------------+-------+-------|
          |   | Receive/transmit - internal oscillator |  On   |  On   |
          |------------------------------------------------------------|
          | Note: Default setting cannot be used if SW6/7 is set to    |
          | on.                                                        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         TEST MODE                          |
          |------------------------------------------------------------|
          |            Setting             |   Label    |   Position   |
          |--------------------------------+------------+--------------|
          | C703 loopback test enabled     |    SW7     |      1       |
          |--------------------------------+------------+--------------|
          | Normal mode enabled            |    SW7     |      2       |
          |--------------------------------+------------+--------------|
          | Dataport loopback test enabled |    SW7     |      3       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          | LED |  Color   |  Status  |           Condition            |
          |-----+----------+----------+--------------------------------|
          | DTE |  Green   |    On    | DTE mode enabled; power is on  |
          |-----+----------+----------+--------------------------------|
          | DTE |   Green  |   Off    |  DTE mode disabled; power is   |
          |     |          |          |              off               |
          |-----+----------+----------+--------------------------------|
          | DCE |   Green  |    On    | DCE mode enabled; power is on  |
          |-----+----------+----------+--------------------------------|
          | DCE |  Green   |   Off    |  DCE mode disabled; power is   |
          |     |          |          |              off               |
          |-----+----------+----------+--------------------------------|
          | TD  |   Yellow |    On    | Ones are being transmitted to  |
          |     |          |          |            network             |
          |-----+----------+----------+--------------------------------|
          | TD  |   Yellow |   Off    | Zeros are being transmitted to |
          |     |          |          |            network             |
          |-----+----------+----------+--------------------------------|
          | TD  |  Yellow  | Blinking |    Ones and zeros are being    |
          |     |          |          |     transmitted to network     |
          |-----+----------+----------+--------------------------------|
          | RD  |   Yellow |    On    |  Ones are being received from  |
          |     |          |          |            network             |
          |-----+----------+----------+--------------------------------|
          | RD  |   Yellow |   Off    | Zeros are being received from  |
          |     |          |          |            network             |
          |-----+----------+----------+--------------------------------|
          | RD  |  Yellow  | Blinking |    Ones and zeros are being    |
          |     |          |          |     received from network      |
          |-----+----------+----------+--------------------------------|
          | TST |    Red   |    On    |   Access unit is executing a   |
          |     |          |          |              test              |
          |-----+----------+----------+--------------------------------|
          | TST |    Red   |   Off    | Access unit is not executing a |
          |     |          |          |              test              |
          |-----+----------+----------+--------------------------------|
          | ALM |    Red   |    On    |  Alarm condition detected on   |
          |     |          |          |            network             |
          |-----+----------+----------+--------------------------------|
          | ALM |    Red   |   Off    |  Alarm condition not detected  |
          |     |          |          |           on network           |
          |-----+----------+----------+--------------------------------|
          | TXL |    Red   |    On    |  Transmit clock loss detected  |
          |-----+----------+----------+--------------------------------|
          | TXL |   Red    |   Off    |    Transmit clock loss not     |
          |     |          |          |            detected            |
          |-----+----------+----------+--------------------------------|
          | RXL |    Red   |    On    |  Receive signal loss detected  |
          |-----+----------+----------+--------------------------------|
          | RXL |   Red    |   Off    |    Receive signal loss not     |
          |     |          |          |            detected            |
          +------------------------------------------------------------+