LinuxSA Mailing list archives

  From: Glen Turner <glen.turner@aarnet.edu.au>
  To  : <linuxsa@linuxsa.org.au>
  Date: Mon, 27 Nov 2000 16:24:40 +1030

Re: ADSL Enabled Exchange Areas: Updated 20/11/2000

Richard Sharpe wrote:

> >CONDITIONS NOT SUPPORTED
> >The following terminal operating conditions are not supported by Telstra and
> >may affect the PSTS service levels in this Attachment:
> >....
> >Data modems and facsimile Customer Equipment working at data signalling
> >rates greater than 2400 bit/s.
> 
> This indicates confusion, and was probably not checked by one of Telstra's
> techos. 'signalling rates' indicates baud, while they have written 2400
> b/s, which as others have said, is not the same.

I queried this with Telstra at the time.  They meant "bps".  Essentially
Telstra were pulling a fast one over the Department of Communications 
And The Rest.

With 2.4Kbps they can identify and re-route modem calls whilst
compressing voice to 5.5Kbps.  The voice compression kills
modulations like QAM that get more than 2.4Kbps out of 2.4Kbaud.

The compression was desirable as Telstra runs microwave bearers
to remote regions.

Glen

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