AT&T PARADYNE

COMSPHERE 3820

Modem Type                   Data (synchronous/asynchronous)/Fax
Maximum Data Rate            19.2Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     External
Fax Class                    Class I & II
Data Modulation Protocol     AT&T V.32terbo

                             Bell 103A/212A

                             ITU-T V.21, V.22, V.22bis, V.32, V.32bis
Fax Modulation Protocol      ITU-T V.17, V27ter, V.29 (optional)
Error Correction/Compression MNP5, V.42, V.42bis

[Image]

                                CONNECTIONS

         Purpose             Location          Purpose          Location

  Line out                     CN1        Scroll left on LCD      CN6

  Line in                      CN2        Scroll right on         CN7
                                          LCD

  RS-232/422                   CN3        Up one level on         CN8
                                          LCD

  DC power                     CN4        Go to top level on      CN9
                                          LCD

  Network Management           CN5        Power switch            SW1
  System

                         DIAGNOSTIC LED(S)

    LED        Color     Status               Condition

  RTS/105      Green       On            RTS signal is high

  RTS/105      Green       Off            RTS signal is low

  CTS/106      Green       On            CTS signal is high

  CTS/106      Green       Off            CTS signal is low

  TXD/103      Green       On        Modem is transmitting data

  TXD/103      Green       Off     Modem is not transmitting data

  LSD/109      Green       On          Carrier signal detected

  LSD/109      Green       Off       Carrier signal not detected

  RXD/104      Green       On          Modem is receiving data

  RXD/104      Green       Off       Modem is not receiving data

     SQ       Yellow       On        Incoming signal is degraded

     SQ       Yellow       Off            Normal operation

                         Proprietary AT Command Set

               See document V1461 for a full command summary.