PATTON ELECTRONICS COMPANY
==========================

   2703

   Card Type         E1 CSU/DSU                                   
   Chip Set          Unidentified                                 
   Transfer Rate     2.048Mbps                                    
   Data Bus          External                                     

<gopher://bitreich.org/I/th99/t/P-R/52437-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |       Function       | Label |      Function       | Label |
   |----------------------+-------+---------------------+-------|
   | 75 ohm coax line in  |  CN1  | 120V or 230V AC     |  CN5  |
   | or out               |       | power               |       |
   |----------------------+-------+---------------------+-------|
   | 120 ohm shielded     |  CN2  | Fuse for 120V: 250V |  F1   |
   | twisted pair         |       | @ 50mA              |       |
   |                      |       |                     |       |
   |                      |       | Fuse for 230V: 250V |       |
   |                      |       | @ 32mA              |       |
   |----------------------+-------+---------------------+-------|
   | 75 ohm coax line in  |  CN3  | Power switch        |  SW1  |
   | or out               |       |                     |       |
   |----------------------+-------+---------------------+-------|
   | V.35, V.36, or X.21  |  CN4  | Local analog        |  SW2  |
   | port via UD-26       |       | loopback test       |       |
   |                      |       | switch              |       |
   |------------------------------------------------------------|
   |      Note:The information as to which coax connector is    |
   |      for transmit and which is for receive is              |
   |      unidentified.                                         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                 Setting                 | Label | Position |
   |-----------------------------------------+-------+----------|
   |>> | Shield of transmit coax is not      |  LK1  |   Open   |
   |   | grounded                            |       |          |
   |---+-------------------------------------+-------+----------|
   |   | Shield of transmit coax is grounded |  LK1  |  Closed  |
   |---+-------------------------------------+-------+----------|
   |>> | Shield of receive coax is not       |  LK2  |   Open   |
   |   | grounded                            |       |          |
   |---+-------------------------------------+-------+----------|
   |   | Shield of receive coax is grounded  |  LK2  |  Closed  |
   |---+-------------------------------------+-------+----------|
   |>> | Clock master mode disabled          |  LK3  |   Open   |
   |---+-------------------------------------+-------+----------|
   |   | Clock master mode enabled           |  LK3  |  Closed  |
   |---+-------------------------------------+-------+----------|
   |>> | Shield of twisted pair is not       |  LK4  |   Open   |
   |   | grounded                            |       |          |
   |---+-------------------------------------+-------+----------|
   |   | Shield of twisted pair is grounded  |  LK4  |  Closed  |
   |---+-------------------------------------+-------+----------|
   |>> | Auto-detect device connected to     |  LK5  |  Closed  |
   |   | line in                             |       |          |
   |---+-------------------------------------+-------+----------|
   |   | Do not auto-detect device connected |  LK5  |   Open   |
   |   | to line in                          |       |          |
   |---+-------------------------------------+-------+----------|
   |>> | DSU is clock master                 | S1/1  |    On    |
   |---+-------------------------------------+-------+----------|
   |   | DSU is clock slave                  | S1/1  |   Off    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             USER CONFIGURABLE SETTINGS (CON'T)             |
   |------------------------------------------------------------|
   |                 Setting                 | Label | Position |
   |-----------------------------------------+-------+----------|
   |>> | Loopback mode is enabled only by    | S1/4  |   Off    |
   |   | front panel switch                  |       |          |
   |---+-------------------------------------+-------+----------|
   |   | Loopback mode is enabled            | S1/4  |    On    |
   |   | continually                         |       |          |
   |---+-------------------------------------+-------+----------|
   |>> | Transmitted and received data are   | S1/5  |   Off    |
   |   | not inverted                        |       |          |
   |---+-------------------------------------+-------+----------|
   |   | Transmitted and received data are   | S1/5  |    On    |
   |   | inverted                            |       |          |
   |---+-------------------------------------+-------+----------|
   |>> | Power supply set for 230V operation |  SW3  |   Off    |
   |---+-------------------------------------+-------+----------|
   |   | Power supply set for 115V operation |  SW3  |    On    |
   |------------------------------------------------------------|
   |      Note:Setting LK3 to Open overrides S1/1. When LK3 is  |
   |      closed, the DSU may still be set to Slave mode with   |
   |      S1/1.                                                 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 LINE TERMINATION IMPEDANCE                 |
   |------------------------------------------------------------|
   |      Setting       |        LK6        |        LK7        |
   |--------------------+-------------------+-------------------|
   |       75 ohm       |      Closed       |      Closed       |
   |--------------------+-------------------+-------------------|
   |      120 ohm       |       Open        |       Open        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                         LINE SPEED                         |
   |------------------------------------------------------------|
   |      Setting       |       S1/2        |       S1/3        |
   |--------------------+-------------------+-------------------|
   |      256Kbps       |        On         |        On         |
   |--------------------+-------------------+-------------------|
   |      512Kbps       |        Off        |        On         |
   |--------------------+-------------------+-------------------|
   |     1.024Mbps      |        On         |        Off        |
   |--------------------+-------------------+-------------------|
   |     2.048Mbps      |        Off        |        Off        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        CLOCK SOURCE                        |
   |------------------------------------------------------------|
   |        Setting        |       S1/6       |      S1/7       |
   |-----------------------+------------------+-----------------|
   | External clock source |        On        |       On        |
   |-----------------------+------------------+-----------------|
   | Internal clock source |       Off        |       Off       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      SERIAL PORT TYPE                      |
   |------------------------------------------------------------|
   |Setting|S1/8 |S5/1 |S5/2 |S5/3 |S5/4 |S5/5 |S5/6 |S5/7 |S5/8|
   |-------+-----+-----+-----+-----+-----+-----+-----+-----+----|
   | V.35  | N/A | On  | On  | On  | On  | On  | On  | On  | On |
   |-------+-----+-----+-----+-----+-----+-----+-----+-----+----|
   | V.36  | On  | Off | Off | Off | Off | Off | Off | Off |Off |
   |-------+-----+-----+-----+-----+-----+-----+-----+-----+----|
   | X.21  | Off | Off | Off | Off | Off | Off | Off | Off |Off |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  SERIAL PORT TYPE (CON'T)                  |
   |------------------------------------------------------------|
   |Setting| S6/1 | S6/2 | S6/3 | S6/4 | S6/5 |S6/6 |S6/7 |S6/8 |
   |-------+------+------+------+------+------+-----+-----+-----|
   | V.35  |  On  |  On  |  On  |  On  |  On  | On  | On  | On  |
   |-------+------+------+------+------+------+-----+-----+-----|
   | V.36  | Off  | Off  | Off  | Off  | Off  | Off | Off | Off |
   |-------+------+------+------+------+------+-----+-----+-----|
   | X.21  | Off  | Off  | Off  | Off  | Off  | Off | Off | Off |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED  | Color | Status |             Condition              |
   |------+-------+--------+------------------------------------|
   | LED1 | Green |   On   |            Power is on             |
   |------+-------+--------+------------------------------------|
   | LED1 | Green |  Off   |            Power is off            |
   |------+-------+--------+------------------------------------|
   | LED2 | Green |   On   |   DSU is receiving valid signal    |
   |------+-------+--------+------------------------------------|
   | LED2 | Green |  Off   | DSU is not receiving valid signal  |
   |------+-------+--------+------------------------------------|
   | LED3 | Green |   On   |  DSU is operating as master clock  |
   |      |       |        |               source               |
   |------+-------+--------+------------------------------------|
   | LED3 | Green |  Off   |  DSU is operating as slave clock   |
   |      |       |        |               source               |
   |------+-------+--------+------------------------------------|
   | LED4 |  Red  |   On   |    DSU is in loopback test mode    |
   |------+-------+--------+------------------------------------|
   | LED4 |  Red  |  Off   |  DSU is not in loopback test mode  |
   +------------------------------------------------------------+