ISDN & T1 Channels

So from what I understand. A Channel is 64kbps.
ISDN B Channels are 64kbps (carries data) and D Channels are 16kbps and it carries the signal.

How do you logically describe a channel? Just another lane in the highway?

And do the B Channels piggyback ride on the D Channels since their the actual signal?

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Comments

tiersten

DerekAustin26 wrote: »

D Channels are 16kbps and it carries the signal.

It doesn't carry the signal. The D channels are for signalling where the bearer channels are actually set up.

ISDN != T1 as well. ISDN PRI is just usually provided over a T1.

tim100

DerekAustin26 wrote: »

D Channels are 16kbps and it carries the signal.

Also, don't forget that the D Channel is 16kbps in ISDN BRI and 64kbps in ISDN PRI.

bellhead

The entry level interface to ISDN is the Basic Rate Interface (BRI), a 144 kbit/s service delivered over a pair of standard telephone copper wires. The 144 kbit/s rate is broken down into two 64 kbit/s bearer channels ('B' channels) and one 16 kbit/s signaling channel ('D' channel or Data channel).

Per Wikipedia...

Integrated Services Digital Network - Wikipedia, the free encyclopedia