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Date:      Fri, 21 Apr 1995 09:41:13 -0600
From:      Nate Williams <nate@trout.sri.MT.net>
To:        jeffa@sybase.com (Jeff Anuszczyk), mcw@hpato.aus.hp.com
Cc:        questions@FreeBSD.org
Subject:   Re: Annex router
Message-ID:  <199504211541.JAA12577@trout.sri.MT.net>
In-Reply-To: jeffa@sybase.com (Jeff Anuszczyk) "Re: Annex router" (Apr 21, 11:14am)

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> > The problem I have is the carrier keeps dropping once per day, and if lucky
> > it will stay up to 2 days, and that's about it. My questions are :
> 
> Well, as much as I'd love to say you can do *MUCH* better, in the states
> I find that two days would be very good indeed.

I guess my provider is better than average then.  After the initial
first 2 weeks of hassles getting my second line working as a full-time
SLIP/PPP link, I've had uptimes of 2 weeks w/out a line drop.

Granted, my line was guaranteed to be wired (most of the newer lines are
radio), and I live in a small-ish town (< 50K folks).

However, on my second line (radio), every night the telco. does a line
check about 11 p.m. every night which causes my phones to 'fake-ring',
which also caused my modem line to fail every night before I got it
switched to copper.

I've seen many phone co's. do line checking in the middle of the night at
different place, but somehow the line I have now doesn't seem to exhibit
the problem.

> much more experience can give their experiences... but in my mind, unless
> it's a leased line, 24 hours of uptime is good, anymore is great.

I would tend to agree.

> > 1) Is there a way for one to determine which side is actually the culprit ?

It might not be one of the modem's fault as much as a line fault.

> Bad line quality (i.e. intermittent line noise) usually is the #1 culprit.
> Please be aware that the faster the modem the more susseptible to noise
> it is.  28.8K modems (V.34) are pretty decent in their recovery capability
> but they can drop the link when the noise gets bad enough.

Also note if you have one of the cheaper 28.8K modems, they will retrain
down due to bad line noise, but *NOT* retrain up.  This means that for
some folks, it's better to drop/re-connect since you have a better
chance of keeping a high speed link.

If you're modems hold onto the link, the modems will realize the line quality
is not that good and drop their speed.  So, after 3 days your 28.8K modems are
doing 2400 baud and require a power-cycle anyway. :(

[ Other good advice deleted ]



Nate




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