Some additional information is required here.
First, the maximum limit is 53K (US) imposed by the line voltage restriction
place upon telcos in the U.S. The speed reported is for only the instant it
was measured as the connection changes dynamically over lifetime of
connection. There can be only one A-D conversion in the line which terminates
at the telco switch with a trunk side T-1.
Jay Hennigan <[EMAIL PROTECTED]> wrote:
> On Sat, 9 Sep 2000, Mari Misato wrote:
>
> > Hi Group
> >
> > When you use a 56K modem to connect to internet,
> > you never achieve 56K. For example, sometimes it
> > shows that the bytes sent at 48000 bps, sometimes
> > 45000 bps, everytime it's different. So, where has
> > those "bandwidth" gone to?? (<--please correct if
> > I'm wrong on this) So, can I conclude that a 56K
> > modem is only theoretically 56K???
>
> Marketing. It's gone to the same place as the extra miles on the MPG
> estimates, the extra minutes of runtime on cellular batteries, etc.
>
> During the lengthy "song of modems mating" heard when the call connects,
> both ends test the ability of the analog line to handle various
combinations
> of level, phase, and frequency, and negotiate the highest speed at which
> data can be passed at that particular time over that particular connection,
> with a resonable and correctible error rate. During the process of the
call,
> the top speed may be renegotiated. And, anything over 33.6 only occurs if
> one end is a digital (ISDN or T-1) connection, and only in the direction
> from the digital side to the analog side.
>
> Your mileage may vary. Batteries not included. This 56K modem was full
> when packed. Contents may have settled during shipment.
>
> --
> Jay Hennigan - Network Administration - [EMAIL PROTECTED]
> NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/
> WestNet: Connecting you to the planet. 805 884-6323
>
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