Which type of ISDN circuit provides 23 B channels and 1 D channel?
A) BRI
B) IDSL
C) PRI
D) SDSL
C
Explanation: There are two different types of ISDN circuit: Primary Rate Interface (PRI) and Basic Rate Interface (BRI). A PRI provides 23 B channels and 1 D channel (64 kbps). A BRI provides 2 B channels and 1 D channel (16 kbps).
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