[comp.dcom.modems] V.42bis Connect String

CHARLIE@UMVMA.BITNET (Charlie Turner) (02/13/91)

I recently installed a V.32 modem with V.42bis on my PC BBS. One of my
callers recently ask an interesting question that I couldn't answer.
He asked how he could tell whether his V.42bis modem and mine actually
established a V.42bis connection or just a V.42 (no bis) connection.

My guess is that a V.42 connection will generate the result code:
  'CONNECT 9600-LAPM' (this may not be the exact format of that message)
while a V.42bis connection will generate:
  'CONNECT 9600-LAPM-COMP'
ie. the difference is the 'COMP' in the result message.

Is this true - is the difference between V.42bis and non bis the
presence or absense of the data compression capability? Would two
V.42bis modems ever connect 'MNP-COMP' instead of 'LAPM-COMP'?

Thanks.