How the B and D channels share the line?
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What happens to these bits when they are received by the ISDN telephone at the other end?
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.
What is the call termination message called?
What channel do the call management messages use?
If none of the equipment connected to an NT1 requires a power supply through the interface, do I need to attach the NT1 to the mains?
How Analogue fax and modem over ISDN?
In order to be able to plug analogue devices into sockets on an NT1, what extra item of equipment would need to be included within the the NT1?
How to Establish the Link Layer?
What are the two types of equipment that can be used on ISDN called?
How ISDN allows multiple devices to share a single line?
 What is the name of the reference point that is located on the user side of an NT1?