Thank you everyone who responded my original question
and gave useful URLs!
Regards
>From: Petra Hofmann <[EMAIL PROTECTED]>
>To: Jay Hennigan <[EMAIL PROTECTED]>, Mari Misato <[EMAIL PROTECTED]>
>CC: [EMAIL PROTECTED]
>Subject: Re: [Re: Modem question]
>Date: 11 Sep 00 10:38:51 CDT
>
>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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