Question Bank - Computer Networks

Here's the question bank on all the computer networks topics.

U interface in ISDN is the interface between

A.
PSTN and Desktop
B.
TA and ISDN Phone
C.
TA and non-ISDN Device
D.
TA and PSTN

Solution:

The U interface or U reference point is a Basic Rate Interface (BRI) in the local loop of an Integrated Services Digital Network (ISDN). It is characterized by the use of a 2-wire transmission system that connects the network termination type 1 (NT1) on the customer's premises and the line termination (LT) in the carrier's local exchange.

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