Re: [hylafax-users] factors in bad scan lines

["Jay R. Ashworth" <jra@baylink.com>]

On Tuesday, August 22, 2000, at 12:06:24 AM, Lee Howard wrote:
> I'm trying to work on a config file for a Supra 288i Sp modem.  This isn't
> critical, I'm just trying to get a feel for general config file
> customization.  Anyway, I've seen this before with various modems, and I
> don't understand it.  It seems to be line noise, but it's not.  If I put a
> USR/3Com modem on the same line I don't have any of these bad scan lines,
> but the minute that this modem is there, I get lots of them.  I've noticed
> that frequency of bad scan lines will vary from modem to modem in general
> anyway.  I've used USR, Rockwell, Supra, and 3Com over the past months
> (only to notice that I never have bad scan lines with the 3Com/USR,
> occasional with Rockwell, and constant with Supra).  I'll be trying a few
> more this coming week, too.
> A typical yucky log follows:

Y'know, Lee; that log looks an awful-helluva lot like flow control.
Especially all those incoming TSI's.

The USR has some instrumentation for Line levels, though I forget
where, and I think the Supra may have an S-register for that sort of
thing, too; I had one to play with, but that's been 8 years back.

It's possible that the Supra defaults to insufficient sensitivity to
play nicely with your phone line; is it copper, or through some sort
of phone system?

Cheers,
-- jra
-- 
Jay R. Ashworth                                                jra@baylink.com
Member of the Technical Staff     
The Suncoast Freenet
Tampa Bay, Florida     http://baylink.pitas.com                +1 727 804 5015




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