What is LAP-D?
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How configuration errors in the ISPBX can prevent successful connections?
What do the layers look like?
How the structures of BRI and PRI compare
If two ISDN channels are used together, each connecting the same pair of users, how many calls are being made?
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.
How many devices may be connected to a BRI?
What are the two options for implementing fax using an internal ISDN card?
 What is the name of the reference point that is located on the user side of an NT1?
What channel does the end-to-end connection use?
How many devices may be connected to a PRI?
Name the two forms in which an ISDN service can be provided to the user. ISDN can be supplied to the user in two forms:
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?