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From: brian@sdcsvax.UUCP (Brian Kantor)
Newsgroups: net.dcom
Subject: Re: Phone line blues
Message-ID: <1522@sdcsvax.UUCP>
Date: Sat, 8-Mar-86 19:54:20 EST
Article-I.D.: sdcsvax.1522
Posted: Sat Mar  8 19:54:20 1986
Date-Received: Mon, 10-Mar-86 00:16:07 EST
References: <223@iuvax.UUCP> <229@gc49.UUCP>
Reply-To: brian@sdcsvax.UUCP (Brian Kantor)
Distribution: net
Organization: UCSD wombat breeding society
Lines: 24

We had a similar problem where when the phone co installed a new switch
- some exchanges could work without errors, others were completely
unusable.  I'm told that it was that the digital trunks were not
synchronized, and that after some clock rate tweaking things got a lot
better.

The bursty sort of errors you describe sound like a sync problem - where
the lines loose sync and have to recover it.  Normally this is nearly
inaudible, but it tears the hell out of synchonous signals like modems
and such.

How did we cure it?  By having lots of trouble calls placed by the
system administrators of the computers affected.  After a week or two
the PhoneCo got somebody (I think I heard it was an engineer from the
switch manufacturer) who knew what he was doing and got things
corrected.

It works pretty well now.  Except that we had to add a delay between
dialling 9 and the rest of a number, because the new improved switch
can't handle 91234567 as quickly as the old one could.  Sigh.

Oh yeah, voice always sounded good.  And 300 baud modems worked just
fine.
	- Brian