RAD DATA COMMUNICATIONS

ASM-20 V.35

Modem Type               Data (Synchronous)
Maximum Data Rate        144Kbps
Data Bus                 External
Data Modulation Protocol Proprietary

[Image]

                                CONNECTIONS

        Purpose           Location            Purpose            Location

  V.35                       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

             ANALOG LOOPBACK

  Setting                    JP7

  » Enabled           Pins 1 & 2 closed

  Disabled            Pins 2 & 3 closed

              BAUD RATE

  Setting                 SW1

  128Kbps                  0

  112Kbps/144Kbps          1

  » 64Kbps                 2

  56Kbps/72Kbps            3

  48Kbps                   4

  32Kbps                   5

                CD SIGNAL

  Setting                    JP3

  CD normal           Pins 1 & 2 closed

  » CD forced high    Pins 2 & 3 closed

         CHASSIS TO SIGNAL GROUND

  Setting                    JP10

  » Connected         Pins 2 & 3 closed

  Disconnected        Pins 1 & 2 closed

                     CLOCK SOURCE

  Setting         JP1/A         JP1/B        JP1/C

  » Internal     Closed         Open          Open

  External        Open         Closed         Open

  Receive         Open          Open         Closed

                        ENABLE PUSHBUTTONS

  Setting                                      JP9

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

  Disabled                              Pins 2 & 3 closed

            RECEIVE IMPEDANCE

  Setting                    JP6

  » 135omhs           Pins 1 & 2 closed

  Low                 Pins 2 & 3 closed

             REMOTE LOOPBACK

  Setting                    JP8

  » Enabled           Pins 1 & 2 closed

  Disabled            Pins 2 & 3 closed

                   REMOTE POWER FAILURE

  Setting                                JP12

  » Transmit RPF tone             Pins 1 & 2 closed

  Doesn’t transmit RPF tone       Pins 2 & 3 closed

               RTS/CTS DELAY

  Setting    JP2/A      JP2/B      JP2/C

  0ms        Closed      Open      Open

  » 9ms       Open      Closed     Open

  70ms        Open       Open     Closed

            TRANSMIT IMPEDANCE

  Setting                    JP5

  » 135omhs           Pins 1 & 2 closed

  Low                 Pins 2 & 3 closed

              TRANSMIT LEVEL

  Setting                    JP4

  » 0dBm              Pins 1 & 2 closed

  -6dBm               Pins 2 & 3 closed

                V.54 DELAY

  Setting                    JP11

  » 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