Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!uakari.primate.wisc.edu!crdgw1!ge-dab!tarpit!bilver!bill
From: bill@bilver.UUCP (Bill Vermillion)
Newsgroups: comp.dcom.modems
Subject: Re: Modem Com analyzer wanted
Message-ID: <1084@bilver.UUCP>
Date: 7 Oct 90 18:07:47 GMT
References: <1990Oct07.123733.15484@virtech.uucp->
Reply-To: bill@bilver.UUCP (Bill Vermillion)
Organization: W. J. Vermillion - Winter Park, FL
Lines: 33

In article <1990Oct07.123733.15484@virtech.uucp-> cpcahil@virtech.uucp (Conor P. Cahill) writes:
->I am looking for a product that I can plug in between the modem and
->the PHONE system (not that this is on the telo line, not the serial
->line - I already have a serial analyzer) to capture the data being
->transmitted and be able to make some sense out of it.
->
->This think would need to understand V.22, V.22bis, and V.32.
->
->Anyone know of such a beast?  I would presume that modem manufacturers
->would have one but I am afraid that it may be home-grown.
->
->The reason I need this is that one of my clients is having trouble
->with a modem dropping calls and/or locking up and we need to figure
->out what is going on. 
->-- 

Why not just put another modem on the line after the first in a
monitor only mode?  You could capture and then do a compare with
what was supposed to be received.   Reverse the lines and look at
transmit.   (Actually reverse the functions either A or O and set
S10 to 255 to never notice carrier drop).

Then you turn the transmitter off.
AT compatible command sets show this as setting the register C.
ATC0  turns the transmitter off and your modem is a listener only.

I just looked this up in my 1982 Hayes SmartModem manual.  Can you
beleive that sucker cost $550 discounted, for 1200 BPS then!!
Modem's dead, but the manual is still fine :-)

-- 
Bill Vermillion - UUCP: uunet!tarpit!bilver!bill
                      : bill@bilver.UUCP