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From: "J. P. Gilliver (John)" 
Newsgroups: microsoft.public.windowsxp.general
Subject: Re: Cloning a 2.5" IDE/PATA Laptop Hard drive
Date: Tue, 14 Nov 2017 01:12:44 +0000
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In message , Paul  
writes:
[]
>But you know why that is, right ?
>
>Your download max was 33.6, not 56K.
>
>A 56K modem has a fallback to 33.6K protocol, if the modem pool at the
>other end indicates it doesn't support 56K.

It was only ever 56k for download, basically because the mainframe 
computer via the telephone system effectively had direct control of the 
D-A converter in the exchange and could thus generate the waveform, 
whereas in the upload direction, your computer (MoDem) did not know the 
sampling instant of the A-D in the exchange, so had to go slow enough 
(oversimplifying) that waveform detection worked.
>
>The people who run modem pools, can't always afford to upgrade them.
>
>There are standards like V.34, V90, and V92. I didn't get
>V92 here - AFAIK, things stopped here at V90.

Wasn't the difference between V90 and V92 just a firmware upgrade, not 
requiring hardware changes? It was all such a Long Time Ago ... (-:
[]
>The deployment of ISDN was delayed enough, it overlapped
>with ADSL, and thus ISDN couldn't have any momentum.
[]
>The people in Europe seemed to have access to ISDN,
>and I vaguely remember some "Fritz modem" being used
>for the ISDN end.
>
>   Paul

I don't think it really got wide use here (UK) - certainly not for home 
use, and I don't think much for business; (a) it was too expensive, (b) 
I don't think it was asymmetrical (the A in ADSL, though I gather that's 
usually omitted in US), which is what most people want. Again, ADSL 
appeared here too before ISDN had much chance to be introduced.
-- 
J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

"Going to church doesn't make you a Christian anymore than going to a garage
makes you a car." - Laurence J. Peter
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