What the B and D channels do?
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What is the initial call request message called?
In practice, what is the maximum number of devices that may be connected to a BRI which expects a fixed TEI?
What is the essential difference between ISDN and the ordinary telephone system (PSTN)?
What is ISDN's history?
What are the two protocols which perform rate adaptation?
What are SAPIs?
What kind of cabling is used for a BRI?
Why is rate adaptation necessary?
What is 2B1Q?
 What is the name of the reference point that is located on the user side of an NT1?
A fax call call might be designated as a generic analogue call or specifically as a fax call - true or false?
What must each SETUP message contain?