Re: 28800 modems?

[Peter Klyne <pak@xxxxxxxxxxxx>]

Don wrote:
> 
> Dumb question, doesn't telco basically have a effective datarate on
> switched analog lines of about 37kb???

Classic opinion.
Ever since 600 BAUD there has been a difference in the rate of
transmission over the phone line and the BITS PER SECOND rating of the
modem.

This is highlighted with the current generation of modems with data
compression where the line speed (DCE - Data Communications Equiptment
e.g. 28.8 kBps) and terminal speed (DTE e.g. 57.6 kBps, 115.2 kBps).

The differing speeds are handeled by buffering the the local modem and
with hardware flow control.

The improved line capacity is a function of more sophisticated
modulation (encoding) techniques to keep the signal within the
antiquated telco capacity standards. 
-- 
Peter Klyne     Enki Associates Ltd     Systems & Performance Consulting
Tel: +1 (416) 223 2506  Fax: +1 (416) 223 3299  e-mail: pak@interlog.com
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