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Originally Posted by Cephas
As I said, it depends on which way you came up. You've been taught a derivation of the standard Nortel/Bell viewpoint - identical except you're using the term DS1 (which most Nortel folks don't use at all) instead of PRI.
ISDN PRI is officially defined as 23b+d, usually the confusion comes in with T1 vs DS1. In the Lucent Avaya universe the DS1 is the 1.54Mbps pipe, and T1 protocol divides the bandwidth into 24 56k channels.
FYI you can use either T1 or PRI protocol to voice network two PBX's (depending on the PBX's of course). T1 will give you the one extra voice path, PRI will give you additional integration features (Qsig, H.450, etc)
Cephas
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I agree that it was how you were taught. My version is that a DS1 is the physical 1.544Meg pipe that can either be administered as a T1 or a PRI. The big difference in the voice world being that with T1 all of the call setup, connection and teardown signallling is done within the specific channel in question (i.e. if a call is being made on channel 7, then all signalling is done within channel 7.) With a PRI all of the signalling is done on the D channel - ususally channel 24, regardless of which channel will bear the call. Hence, if a call is to be made on channel 7, one end tells the other end all of the specifics via data packets on channel 24. That's how I teach my folks...
Mike