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- The D channel carries Network Services in the form of signalling. This is
the way the user maintains his relationship with the network. Each user has
one and only one D channel.
- The B channel carries Bearer Services which are the communication between
two users. A single B channel cannot connect more than two users together.
- B channels and D channels share time on the interface.
- B channels cannot be sub-divided to provide less bandwidth
- More than one B channel can be used together to provide more bandwidth
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