What are BRI and PRI? What are Channels?
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If two ISDN channels are used together, each connecting the same pair of users, how many calls are being made?
What are the two options for implementing fax using an internal ISDN card?
Why is there only one D channel in each interface?
Bearer Capabilities - What are they?
Does the network provider supply the NT1 in North America?
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?
Why can you not normally send data between users through the D channel?
What is the D channel used for?
A device is configured for automatic TEI. What is its address immediately after being switched on - before it starts communicating with the network?
 What is the name of the reference point that is located on the user side of an NT1?
A user on an ISPBX can use different D-Channel protocols to those in use by the public ISDN network connected to the ISPBX - true or false?
What are B channel charateristics?