Re: how fast are Mod 170 comm ports

[Jim Langston <jlangston@xxxxxxxxxxxxxxxx>]

I would have to disagree.  Specifically, with the term "using any method".
DSL uses two wires (www.2wire.com for example) and yet speeds can
go above T1 speeds (1.54mps or so).

At home, on 2 wires, I am running 768k/sec down, 128k/sec up.  For $50
a month.  I would say this is using two wires using any method and is definately
faster than 33.6.

Now... perhaps the article was talking about analog signals being limited to 
33.6?
They currently go faster than this using compression, but I think the actual 
signal
speed is still 19.2 or thereabouts.

Regards,

Jim Langston

Date: Mon, 10 Jul 2000 09:44:35 -0400
From: Pat Barber <mboceanside@worldnet.att.net>
Subject: Re: how fast are Mod 170 comm ports

Larry Bolhuis wrote:

> what you pay for.  Also remember the high speed is download only,
> uploads will never exceed 33.6K.

I know I'll never find it again, but a few years back some engineer
type from one of the modem companies wrote an article for either
Midrange Computing or News/400 on the physical limits of modems. As
I recall, the physical limit on two wires using any method was 33.6
which was reached by the amount of electricity you could shove through
a very thin wire. The article explained all the math equations that
prove this out.

In a large account that I did some work for, the question came up
about "just" how fast their lease lines were running. We finally
came to the conclusion that there really isn't a sure fire way to
measure through put on a comm line with any software tools.

The phone company remains the only source of this information and
I could not find a proof postive way to determine if a V.35 line
was "really" running at 512kb.

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