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What is ISDN?
- It is important to remember that ISDN channels cannot be be divided up into
smaller units. Each is provided on an "all or nothing" basis.
- Two users communicating over a B channel have 64 000
bits per second available to them. There is nothing they can do to reduce this
bandwidth.
- What about the situation where the two users find that 64 000 bits per second is not sufficient?
The only solution is to add another B channel. This gives them 128 000 bits
per second. They are not using a single B channel of 128 000 bits
per second. (Don't forget that the speed of a B channel is defined as 64 000 bits
per second. Anything which operates at a different speed isn't a B channel.)
- This means that they will have two parallel calls between them and the phone bill will show two simultaneous calls.
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