Newsgroups: comp.dcom.modems
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!neoucom.edu!wtm
From: wtm@uhura.neoucom.EDU (Bill Mayhew)
Subject: Re: Over 1000 cps with PEP?
Message-ID: <1991Jun22.160247.8304@uhura.neoucom.EDU>
Summary:  Noisy PBX system
Organization: Northeastern Ohio Universities College of Medicine
References: <1991Jun19.003439.7587@emperor.scs.com>
Date: Sat, 22 Jun 91 16:02:47 GMT

Our PBX system uses a TDM bus to switch calls.  The system, whose
type number I don't know, is made by Harris.  Our
telecommunications engineer tells me that Harris recommends that
2400 is the highest reliable modem rate that the switch can handle.
I have empirically verified that our in-house modem-to-modem calls
with v.32 are troublesome.  We normally run our modems through
direct outside lines and only tested using the Harris PBX switch
for use as a bakcup if our computer services lines went out for
some reason.  I'd imagine that PEP rates are much lower too.

Centrex supplied by the telco might behave very differently from
our PBX experiences.  Centex terminates extensions in the telco's
switch doesn't it?  If so the grade of equipment doing the
switching might be higher.  If the switch is a long way away, there
could be oportunity for signal degredation.

Bill

-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu   ....!uunet!aablue!neoucom!wtm
via internet: (140.220.001.001)