How ISDNs are connected together?
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How to Establish the Link Layer?
 What is the name of the reference point that is located on the user side of an NT1?
How the B and D channels share the line?
What are TEIs?
How users are connected to a public ISDN through an ISPBX?
How to vary the the amount of bandwidth you have available to you?
call flow in nss ? and what is sri signal?
Do users on an ISPBX have a D channel connection to the ISPBX or to the public ISDN network? The users on an ISPBX do not communicate directly with the public network at all.
Why can you not normally send data between users through the D channel?
Number of devices equals number of subscriber numbers required for MSN - true or false?
What is the device inside an ISDN telephone that converts voice into digits?
What protocols are used?