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       # RAD DATA COMMUNICATIONS
       
          FCD-E1/2/E1
       
          Card Type        CSU/DSU                                       
          Chip Set         Unidentified                                  
          I/O Options      AC power connector, 25-pin connectors (2      
                           RS-530), BNC connectors (4)                   
                                                                         
                           9-pin serial ports (2 RS-232),                
                                                                         
                           E1 network interface via RJ-48 connectors (4) 
          E1 Transfer Rate 2.048Kbps                                     
          E1 Protocol      HDB3                                          
          Frame type       CRC-4                                         
          Data Bus         External                                      
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |       Function       | Label |      Function       | Label |
          |----------------------+-------+---------------------+-------|
          | AC power connector   |  CN1  | DCE serial port     | CN10  |
          |----------------------+-------+---------------------+-------|
          | DTE serial port      |  CN2  | Sub network port    | CN11  |
          |                      |       | via RJ-48 connector |       |
          |----------------------+-------+---------------------+-------|
          | Channel 1 port       |  CN3  | Main network port   | CN12  |
          | (25-pin connector)   |       | via RJ-48 connector |       |
          |----------------------+-------+---------------------+-------|
          | Channel 2 port       |  CN4  | BNC connector -     | RXIN  |
          | (25-pin connector)   |       | unbalanced receive  |       |
          |                      |       | in                  |       |
          |----------------------+-------+---------------------+-------|
          | Header connector to  |  CN5  | BNC connector -     | RXOUT |
          | sub link interface   |       | unbalanced receive  |       |
          | board                |       | out                 |       |
          |----------------------+-------+---------------------+-------|
          | Header connector to  |  CN6  | BNC connector -     | TXIN  |
          | CH2 interface board  |       | unbalanced transmit |       |
          |                      |       | in                  |       |
          |----------------------+-------+---------------------+-------|
          | Header connector to  |  CN7  | BNC connector -     | TXOUT |
          | CH2 interface board  |       | unbalanced transmit |       |
          |                      |       | out                 |       |
          |----------------------+-------+---------------------+-------|
          | Header connector to  |  CN8  | Power switch        |  SW2  |
          | CH2 interface board  |       |                     |       |
          |----------------------+-------+---------------------+-------|
          | Header connector to  |  CN9  |                     |       |
          | CH2 interface board  |       |                     |       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |                 Setting                 | Label | Position |
          |-----------------------------------------+-------+----------|
          | » | Signal ground is connected to the   |  JP8  |  Closed  |
          |   | frame ground                        |       |          |
          |---+-------------------------------------+-------+----------|
          |   | Signal ground is not connected to   |  JP8  |   Open   |
          |   | the frame ground                    |       |          |
          |---+-------------------------------------+-------+----------|
          | » | Transmit side ground reference set  |  JP9  |   Open   |
          |   | for balanced interface              |       |          |
          |---+-------------------------------------+-------+----------|
          |   | Transmit side ground reference set  |  JP9  |  Closed  |
          |   | for unbalanced interface            |       |          |
          |---+-------------------------------------+-------+----------|
          | » | Receive side ground reference set   | JP10  |   Open   |
          |   | for balanced interface              |       |          |
          |---+-------------------------------------+-------+----------|
          |   | Receive side ground reference set   | JP10  |  Closed  |
          |   | for unbalanced interface            |       |          |
          |---+-------------------------------------+-------+----------|
          | » | Front panel push-buttons enabled    | JP77  |   Open   |
          |---+-------------------------------------+-------+----------|
          |   | Front panel push-buttons disabled   | JP77  |  Closed  |
          |---+-------------------------------------+-------+----------|
          | » | Supervisor ports operate according  | S1/1  |   Off    |
          |   | to user-defined parameters          |       |          |
          |---+-------------------------------------+-------+----------|
          |   | CSU/DSU uses default parameters     | S1/1  |    On    |
          |   | stored in its EPROM                 |       |          |
          |---+-------------------------------------+-------+----------|
          | » | Default password enabled.           | S1/2  |    On    |
          |   | Password=RAD                        |       |          |
          |---+-------------------------------------+-------+----------|
          |   | User password enabled               | S1/2  |   Off    |
          |---+-------------------------------------+-------+----------|
          | » | Loads user-selected parameters from | S1/3  |   Off    |
          |   | NVRAM on power-up                   |       |          |
          |---+-------------------------------------+-------+----------|
          |   | Loads default parameters stored in  | S1/3  |    On    |
          |   | its EPROM on power-up               |       |          |
          |---+-------------------------------------+-------+----------|
          | » | Factory configured - do not alter   | S1/4  |   Off    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    MAIN LINK INTERFACE                     |
          |------------------------------------------------------------|
          |  Function   | JP7  |JP12/A|JP12/B|JP12/C|JP12/D|JP33 |JP35 |
          |-------------+------+------+------+------+------+-----+-----|
          |»| Balanced  | Open | Open |Closed| Open | Open |2 & 3|2 & 3|
          | | interface |      |      |      |      |      |     |     |
          |-+-----------+------+------+------+------+------+-----+-----|
          | |Unbalanced |Closed| Open | Open | Open |Closed|1 & 2|1 & 2|
          | | interface |      |      |      |      |      |     |     |
          |------------------------------------------------------------|
          |Note: Pins designated are in the closed position            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        ALARM RELAY                         |
          |------------------------------------------------------------|
          |                  Function                  | JP51  | JP52  |
          |--------------------------------------------+-------+-------|
          | » |   Alarm relay disconnected. DTE port   | 2 & 3 | 2 & 3 |
          |   |   (CN2) provides full functionality    |       |       |
          |---+----------------------------------------+-------+-------|
          |   |  Alarm relay connected instead of DCD  | 1 & 2 | 1 & 2 |
          |   |             and CTS lines              |       |       |
          |------------------------------------------------------------|
          | Note: Pins designated are in the closed position           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          |   LED    |    Color     | Status |        Condition        |
          |----------+--------------+--------+-------------------------|
          |   LOC1   | Unidentified |   On   |  Local synchronization  |
          |          |              |        |    lost on main link    |
          |----------+--------------+--------+-------------------------|
          |   LOC1   | Unidentified |  Off   |  Local synchronization  |
          |          |              |        |     OK on main link     |
          |----------+--------------+--------+-------------------------|
          |   REM1   | Unidentified |   On   | Remote synchronization  |
          |          |              |        |    lost on main link    |
          |----------+--------------+--------+-------------------------|
          |   REM1   | Unidentified |  Off   | Remote synchronization  |
          |          |              |        |     OK on main link     |
          |----------+--------------+--------+-------------------------|
          |   LOC2   | Unidentified |   On   |  Local synchronization  |
          |          |              |        |    lost on sub link     |
          |----------+--------------+--------+-------------------------|
          |   LOC2   | Unidentified |  Off   |  Local synchronization  |
          |          |              |        |     OK on sub link      |
          |----------+--------------+--------+-------------------------|
          |   REM2   | Unidentified |   On   | Remote synchronization  |
          |          |              |        |    lost on sub link     |
          |----------+--------------+--------+-------------------------|
          |   REM2   | Unidentified |  Off   | Remote synchronization  |
          |          |              |        |     OK on sub link      |
          |----------+--------------+--------+-------------------------|
          |   ALM    | Unidentified |   On   |     Alarm condition     |
          |          |              |        |   detected on network   |
          |----------+--------------+--------+-------------------------|
          |   ALM    | Unidentified |  Off   |   Alarm condition not   |
          |          |              |        |   detected on network   |
          |----------+--------------+--------+-------------------------|
          |      TST | Unidentified |   On   |  Device loopback test   |
          |          |              |        |         active          |
          |----------+--------------+--------+-------------------------|
          |   TST    | Unidentified |  Off   |  Device loopback test   |
          |          |              |        |       not running       |
          +------------------------------------------------------------+
       
 (IMG) IMG 2
          
       
          SUB LINK INTERFACE BOARD
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |        Function         | Label |     Function     | Label |
          |-------------------------+-------+------------------+-------|
          | Header connector to     | CN14  | Line side        |  F3   |
          | mainboard               |       | protection fuse  |       |
          |-------------------------+-------+------------------+-------|
          | Line side protection    |  F1   | Line side        |  F4   |
          | fuse                    |       | protection fuse  |       |
          |-------------------------+-------+------------------+-------|
          | Line side protection    |  F2   |                  |       |
          | fuse                    |       |                  |       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     SUB LINK INTERFACE                     |
          |------------------------------------------------------------|
          |  Function   |  J9  |JP12/A|JP12/B|JP12/C|JP12/D|JP16 |JP17 |
          |-------------+------+------+------+------+------+-----+-----|
          |»| Balanced  | Open | Open |Closed| Open | Open |2 & 3|2 & 3|
          | | interface |      |      |      |      |      |     |     |
          |-+-----------+------+------+------+------+------+-----+-----|
          | |Unbalanced |Closed| Open | Open | Open |Closed|1 & 2|1 & 2|
          | | interface |      |      |      |      |      |     |     |
          |------------------------------------------------------------|
          |Note: Pins designated are in the closed position            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |                 Setting                 | Label | Position |
          |-----------------------------------------+-------+----------|
          | » | Transmit side ground reference set  |  JP8  |   Open   |
          |   | for balanced interface              |       |          |
          |---+-------------------------------------+-------+----------|
          |   | Transmit side ground reference set  |  JP8  |  Closed  |
          |   | for unbalanced interface            |       |          |
          |---+-------------------------------------+-------+----------|
          | » | Receive side ground reference set   | JP10  |   Open   |
          |   | for balanced interface              |       |          |
          |---+-------------------------------------+-------+----------|
          |   | Receive side ground reference set   | JP10  |  Closed  |
          |   | for unbalanced interface            |       |          |
          +------------------------------------------------------------+
       
 (IMG) IMG 3
          
       
          CHANNEL 2 INTERFACE BOARD
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |       Function       | Label |      Function       | Label |
          |----------------------+-------+---------------------+-------|
          | Header connector to  | CN15  | Header connector to | CN17  |
          | mainboard            |       | mainboard           |       |
          |----------------------+-------+---------------------+-------|
          | Header connector to  | CN16  | Header connector to | CN18  |
          | mainboard            |       | mainboard           |       |
          +------------------------------------------------------------+