RAD DATA COMMUNICATIONS

ASM-24 (REV. 1)

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

[Image]

                                CONNECTIONS

         Purpose             Location          Purpose           Location

  V.24/V.35/X.21               CN1       Diagnostic test           DIG
                                         switch

  AC power                     CN2       Analog loopback           ANA
                                         switch

  Ground                       GND       Remote loopback           REM
                                         switch

  Receive                      RCV       Test pattern             PATT

  Transmit                     XMT

             ANALOG LOOPBACK

  Setting                    JP5

  » Enabled           Pins 1 & 2 closed

  Disabled            Pins 2 & 3 closed

       BAUD RATE

  Setting      SW12

  144Kbps        0

  128Kbps        1

  112Kbps        2

  96Kbps         3

  72Kbps         4

  » 64Kbps       5

  56Kbps         6

  48Kbps         7

              CD SENSITIVITY

  Setting                    JP10

  » High              Pins 1 & 2 closed

  Low                 Pins 2 & 3 closed

                CD SIGNAL

  Setting                    JP6

  » CD forced high    Pins 1 & 2 closed

  CD normal           Pins 2 & 3 closed

         CHASSIS TO SIGNAL GROUND

  Setting                    JP3

  » Connected         Pins 2 & 3 closed

  Disconnected        Pins 1 & 2 closed

                     CLOCK SOURCE

  Setting        JP11/A        JP11/B        JP11/C

  Receive        Closed         Open          Open

  » Internal      Open         Closed         Open

  External        Open          Open         Closed

            ENABLE PUSHBUTTONS

  Setting                    JP8

  » On                Pins 1 & 2 closed

  Off                 Pins 2 & 3 closed

            RECEIVE IMPEDANCE

  Setting                    JP2

  » 150omhs           Pins 1 & 2 closed

  High                Pins 2 & 3 closed

              RECEIVE LEVEL

  Setting                    JP14

  » 0dBm              Pins 1 & 2 closed

  -6dBm               Pins 2 & 3 closed

             REMOTE LOOPBACK

  Setting                    JP4

  » Enabled           Pins 1 & 2 closed

  Disabled            Pins 2 & 3 closed

              RTS/CTS DELAY

  Setting                    JP7

  » 8ms               Pins 2 & 3 closed

  70ms                Pins 1 & 2 closed

            TRANSMIT IMPEDANCE

  Setting                    JP1

  » 150omhs           Pins 1 & 2 closed

  Low                 Pins 2 & 3 closed

              TRANSMIT LEVEL

  Setting                    JP13

  » 0dBm              Pins 1 & 2 closed

  -6dBm               Pins 2 & 3 closed

                V.54 DELAY

  Setting                    JP9

  » On                Pins 1 & 2 closed

  Off                 Pins 2 & 3 closed

                             DIAGNOSTIC LED(S)

     LED         Color        Status                 Condition

     PWR         Green          On                  Power is on

     PWR         Green          Off                Power is off

     RTS         Green          On            Request to Send enabled

     RTS         Green          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