Path: utzoo!attcan!uunet!husc6!think!bloom-beacon!apple!rutgers!bpa!cbmvax!vu-vlsi!dsinc!cdin-1!fred
From: fred@cdin-1.uucp (Fred Rump)
Newsgroups: comp.unix.xenix
Subject: Re: Dirty Phone Lines
Summary: dirty lines
Keywords: noise filters, dirty phone lines, serial boards
Message-ID: <7411@cdin-1.uucp>
Date: 7 Oct 88 16:15:48 GMT
References: <7304@well.UUCP>
Organization: CompuData Inc., Philadelphia PA
Lines: 29

In article <7304@well.UUCP>, dave@well.UUCP (Dave Hughes) writes:
> 
> How can I deal with a chronic problem of very noisy incoming phone lines
> to a system from rural analog phones? Users in rural areas are dialing
> in at the rate of over 50 calls a day, over ordinary phone lines, which

We also use US Robotics (the older VAR modem and now the Sportster, internal
for 286, external for 386).

Our users are everywhere and use UUCP for after the magical 11PM cost break to
send mail and news. We found that often there are hourly re-tries before a
logon is successful. But once contact is made, good old Xenix handles it well.

Our biggest difficulty was  with internal switchboard systems. They seem to
make one hell of a racket. Solution was to get users to get a separate line.

For support to rural (upstate PA etc) sites during the day it's often hit or
miss at 2400 baud. 1200 baud is used if noise is dramatic and stuff is lost.
we've even had to go down to 300 on occasion. We have a CALL scripts that
allows various speeds at call time by our support people.

I don't know if any of this is any help. But at least we seem to have overcome
the problems except for 100% first time logon capability.

-- 
Fred Rump, Pres.       | UUCP: {rutgers,cbmvax,bellcore}!bpa!cdin-1!fred
CompuData, Inc.        |  or ...{allegra killer gatech!uflorida decvax!ucf-cs}
10501 Drummond Rd.     |         !ki4pv!cdis-1!cdin-1!fred
Philadelphia, Pa. 19154|  or ...!bikini.cis.ufl.edu!ki4pv!cdis-1!cdin-1!fred