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ISDN and Network Layer (D channel or B channel)

ISDN Data Link Layer has got two protocols ,,,,Which are LAPB(is there any Q?) and LAPD(Q.921).

Is ISDN network layer (Q.931) belong to D-channel or B-channel ?

http://www.buoy.com/~bobh/sccc/cm68/notes/chapter15.html

1 REPLY
Super Bronze

Re: ISDN and Network Layer (D channel or B channel)

Hi

Yes, typically the D channel contains all signalling, so that would be where your network layer info would be.

Some circuits use channel associated signalling (CAS) where the D channel info is actually sent as part of each B channel, but this is less common (at least over here)...

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!
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