Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!csd4.milw.wisc.edu!indri!ames!oliveb!pyramid!prls!gordon
From: gordon@prls.UUCP (Gordon Vickers)
Newsgroups: comp.dcom.modems
Subject: Hayes Smartmodem 1200 bug with AT&T System 85
Message-ID: <23335@prls.UUCP>
Date: 26 Jun 89 23:38:26 GMT
Reply-To: gordon@prls.UUCP (Gordon Vickers)
Distribution: usa
Organization: Philips Research Labs, Sunnyvale, California
Lines: 21


       I am having a problem with a Hayes Smartmodem 1200.
   When the modem is sharing the line with a phone, the modem does
   not always hang up properly.  I do not have the problem if I unplug
   the phone.

       Our phone system is an AT&T System 85 with the thin, ultra light
   (black) AT&T phones that are propped up in back (sorry, I don't recall
   the model number and don't have any in this building).

       Since the modem doesn't appear to be using a relay for going on/off
    hook, I suspect that something just doesn't have enough off resistance
    to cause an on hook condition when an extention phone is in parallel.

       I do not have schematics.  Does anyone know of a modification I
    can make to the modem ?

Thank you,
Gordon Vickers 408/991-5370 (Sunnyvale,Ca); {mips|pyramid|philabs}!prls!gordon
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