On Fri, 29 Sep 2000, Quadri, Habeeb wrote:
> Hello,
>
> I have a scenario that needs explanation from somebody who knows how ISDN
> switches work in carrier enviornment.
> Lets say, I am connected to ISDN provided by LEC (GTE) in Dallas that needs
> to be connected to a ISDN provided by Ameritech in Indy.
> Here is the question, How long distance carrier like AT&T or Sprint or
> 1010288 will know that this is ISDN digital signal with 2B+D channels.
The D channel is only for communication between your ISDN equipment
and your LEC switch, and doesn't enter into the picture on the long
distance portion of the call.
The two B channels are considered separate calls as far as the carrier
is concerned.
In these days, virtually all LD telephone circuits are a 56K or 64K
digital bitstream. There may be some long-distance circuits that can't
hand a 64K clear channel, in which case you'll get a 56K throughput per
channel.
--
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