Modem Questions - Part 2

From: William Levak (wlevak_at_cyberspace.org)
Date: 2002-05-31 21:00:26

I have compiled the modem settings from all the previous answers into a
short table (see below).  The information for the 1660 and 1670 modems
seem to be inconsistent.  Comments/clarifications/corrections please.


                              1660 Modem Jumper

A jumper trace is located between two small squares on edge of the circuit
board on the bottom of the modem next to the edge connector.

Cutting this trace disables the carrier detect and makes the modem behave
like a 1650 modem.  This is required for the Plus/4, and failure to do it
may damage the modem.

                      Older 1670 Modem (3 DIP switches)

Switch   Up                                Down
  1      Single-line connection            Multiple-line connection
                                            (Use if there is anything 
                                            other than a single phone
                                            circuit on the connecting
                                            cable.)
  2      Analog loopback test              Normal use
  3      Enable carrier detect             Disable carrier detect
          (Required for Plus/4.)


                      Newer 1670 Modem (4 DIP Switches)

Switch   Up                                Down
  1      Auto answer (The modem will       No auto-answer
          answer on the 2nd ring.)
  2      Disnable carrier detect           Enable carrier detect
                                            (Required for Plus/4.)
  3      Disable speed detect              Enable speed detect
  4      Enable DTR detect                 DTR always on.



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