What do the layers look like?
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What is ISDN's history?
 What is the name of the reference point that is located on the user side of an NT1?
What device converts the signals between the ISDN and the PSTN networks?
How configuration errors in the ISPBX can prevent successful connections?
What Bearer Capabilities are and on which channel they reside?
Why is there only one D channel in each interface?
What are SPIDs?
A fax machine is configured to filter for analogue calls - will it accept G3 Fax calls? No, it will only accept those calls whose call type is specifically 'Generic Analogue'.
How ISDNs are connected together?
What is the essential difference between them?
Why is rate adaptation necessary?
What call type is given to a fax call coming from an analogue network?