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From: Paul 
Newsgroups: microsoft.public.windowsxp.general
Subject: Re: Cloning a 2.5" IDE/PATA Laptop Hard drive
Date: Tue, 14 Nov 2017 03:23:43 -0500
Organization: A noiseless patient Spider
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Ant wrote:

> 
> Didn't FCC only allow up to 53K speed?

That's a signal amplitude issue. There is some
regulatory limit defined for the phone system.

On the one hand, the C.O. may have some
limits on launch amplitude.

And on the other, telephone receivers have protection
devices across the receiver screw terminals.

I have some first-hand experience, that at least
some telephone company equipment, can put out a
fairly high amplitude signal - high enough I have
to hold the phone three inches from my head, so I
didn't lose an eardrum. The equipment has some
"unused capabilities" that show up occasionally
when something is mis-configured.

A possible explanation might have been crosstalk in
cable bundles, but that's just a guess. On a more modern
POTS system, the copper section is only 500 feet from
your street corner to home, and it's no longer 18000 feet
of wire and associated crosstalk.

> 
> I remember some USR Sportster modems could get V92 firmware upgrades.

Yes, you could get firmware, but if the modem pool doesn't
do V92, it hardly matters. I think a V92 would drop back
to V90 then V.34 and so on, all the way down to 300 baud
if you waited long enough. It's backward compatible all the
way back to the beginning of computing. If you phoned up one
of the old private BBSes, it could well end up running
at 300 or 1200.

    Paul
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