In article <[log in to unmask]>, Ahmad Risk
<[log in to unmask]> writes
>Any time you make a 'circuit-switched' call, say, to the Web, you use
>one or both B channels. If the TA (and the ISP) support 'AO/DI', once
>that call is finished, the D channel kicks in and maintains the
>connection to download email and 'push' updates etc. Small amounts of
>data that do not require the 64 kbps bandwidth.
Thanks..
What are the charges ?? can you hold this D channel indefinitely ??
What do BT and the ISPs think of that ??
--
David Meldrum
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http://www.suffolk-maag.ac.uk
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