
PATTON ELECTRONICS COMPANY

2703

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

[Image]

                                CONNECTIONS

        Function            Label            Function             Label

  75 ohm coax line in or     CN1       120V or 230V AC power       CN5
  out

  120 ohm shielded           CN2       Fuse for 120V: 250V @       F1
  twisted pair                         50mA

                                       Fuse for 230V: 250V @
                                       32mA

  75 ohm coax line in or     CN3       Power switch                SW1
  out

  V.35, V.36, or X.21        CN4       Local analog loopback       SW2
  port via UD-26                       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 grounded       LK1          Open

      Shield of transmit coax is grounded           LK1         Closed

     Shield of receive coax is not grounded        LK2          Open

      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 grounded        LK4          Open

      Shield of twisted pair is grounded            LK4         Closed

     Auto-detect device connected to line in       LK5         Closed

      Do not auto-detect device connected to        LK5          Open
      line in

     DSU is clock master                          S1/1           On

      DSU is clock slave                           S1/1          Off

                    USER CONFIGURABLE SETTINGS (CONT)

                    Setting                        Label       Position

     Loopback mode is enabled only by front       S1/4          Off
      panel switch

      Loopback mode is enabled continually         S1/4           On

     Transmitted and received data are not        S1/5          Off
      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 (CONT)

  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

