RAD DATA COMMUNICATIONS

ASM-20 G.703

Modem Type               Data (Synchronous)
Maximum Data Rate        64Kbps
Data Bus                 External
Data Modulation Protocol Proprietary

[Image]

                                CONNECTIONS

        Purpose           Location            Purpose            Location

  G-703                      CN1       Diagnostic test switch      DIG

  AC power                   CN2       Analog loopback switch      ANA

  Ground                     GND       Remote loopback switch      REM

  Receive                    RCV       Test pattern               PATT

  Transmit                   XMT

                CD SIGNAL

  Setting                    JP1

  CD normal           Pins 2 & 3 closed

  » CD forced high    Pins 1 & 2 closed

         CHASSIS TO SIGNAL GROUND

  Setting                    JP6

  » Connected         Pins 2 & 3 closed

  Disconnected        Pins 1 & 2 closed

                        ENABLE PUSHBUTTONS

  Setting                                      JP5

  » DIG, ANA, REM, PATT enabled         Pins 1 & 2 closed

  Disabled                              Pins 2 & 3 closed

              JITTER FILTER

  Setting                    JP8

  Enabled             Pins 1 & 2 closed

  » Disabled          Pins 2 & 3 closed

            RECEIVE IMPEDANCE

  Setting                    JP4

  » 135omhs           Pins 1 & 2 closed

  Low                 Pins 2 & 3 closed

            TRANSMIT IMPEDANCE

  Setting                    JP3

  » 135omhs           Pins 1 & 2 closed

  Low                 Pins 2 & 3 closed

              TRANSMIT LEVEL

  Setting                    JP2

  » 0dBm              Pins 2 & 3 closed

  -6dBm               Pins 1 & 2 closed

                V.54 DELAY

  Setting                    JP7

  » On                Pins 2 & 3 closed

  Off                 Pins 1 & 2 closed

                             DIAGNOSTIC LED(S)

     LED         Color        Status                 Condition

     PWR         Green          On                  Power is on

     PWR         Green          Off                Power is off

     RTS         Yellow         On            Request to Send enabled

     RTS         Yellow         Off          Request to Send disabled

     TD          Yellow         On          Modem is transmitting steady
                                                       SPACE

     TD          Yellow         Off       Modem is not transmitting data

     TD          Yellow      Blinking       Modem is transmitting data

     RD          Yellow         On        Modem is receiving steady SPACE

     RD          Yellow         Off         Modem is not receiving data

     RD          Yellow      Blinking         Modem is receiving data

     DCD         Yellow         On            Carrier signal detected

     DCD         Yellow         Off         Carrier signal not detected

    TEST          Red           On              Modem in test mode

    TEST          Red           Off           Modem not in test mode

     ERR         Yellow         On            Errors in test pattern

     ERR         Yellow         Off              Good test pattern