Re: HELP! 56K connects @ 26.4

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#136

From: Aaron Leonard
Date: Mon, 16 Nov 1998 00:00

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On Mon, 16 Nov 1998 08:59:26 +0000, peter@cara.demon.co.uk (Peter Ceresole) wrote:
~ ab309@issc.debbsX.ndhq.dnd.ca (Rick Collins) wrote:
~ 
~ >You have the same analogue path, but an entirely different protocol
~ >which uses the available bandwidth differently.  You're essentially
~ >comparing apples and oranges.  I've spoken to several people who
~ >couldn't get better than 26,400 with V.34 but get mid-forties with
~ >X2/V.90.
~ 
~ Thank you. Effectively, then, V90 is a better protocol all round. I guess
~ that's logical; things do develop...

One thing to be aware of though: although V.90 is entirely different
IN THE DOWNSTREAM DIRECTION, it uses a subset of V.34 in the UPSTREAM
direction.  For V.90's uplink direction, the 3429 symbol rate is only
optional, and in practice few (no?) V.90 analog modems implement it.
Therefore V.90 uplinks in practice are limited to 31200 bps, and moreover
since they can't take advantage of the full channel spectrum, you should
see slightly lower uplink speeds across the board (for circuits with
little high-end rolloff.)

If uplink speed is important, then pure V.34 will probably be the
better choice.

Aaron

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<Yg502.17549$357.345@news-reader.bt.net> <36491A4A.291F@all.com> <36499F2F.B4C10A4F@telapex.com> <364A5924.7FBD@all.com> <364AFE92.392D7A44@telapex.com> <B270C3269668253D7@cara.demon.co.uk> <364b83c7.3704381@news.ndhq.dnd.ca> <B272153E96682DC27@cara.demon.co.uk> <364ce2ee.3048661@news.ndhq.dnd.ca> <B27599EE966858024@cara.demon.co.uk>

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From: Aaron@Cisco.COM (Aaron Leonard)
Subject: Re: HELP! 56K connects @ 26.4
Date: 1998/11/16
Message-ID: <3650755b.398577804@news.cisco.com>
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