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14 October, 22:13

How many channels are in an ISDN PRI connection?

2B+D

2D+B

23D+B

23B+D

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Answers (2)
  1. 14 October, 22:28
    0
    23B + D

    Explanation:

    ISDN stands for Integrated Services Digital Network. It makes use of two types of channels:

    B type : which is used for carrying data/voice D type : which carries control and signalling information.

    ISDN supports two different service levels:

    Basic Rate Interface (BRI) - home and small users Primary Rate Interface (PRI) - larger enterprise scenarios

    Both BRI and PRI make use of set of B and D type channels for data transfer.

    BRI consists of 2 B channels and 1 D channel whereas PRI consists of 23 B channels and 1 D channel.
  2. 14 October, 23:35
    0
    D) 23B+D

    Explanation:

    ISDN stands for Integrated Services Digital Network.

    PRI stands for Primary Rate Interface.

    ISDN operates on two different service levels:

    -Basic Rate Interface (BRI) is used by individuals operating on a small scale.

    -Primary Rate Interface (PRI) is used by larger businesses and organizations.

    ISDN PRI consists of 23B channels and one 64Kbps D channel represented as 23B+D.
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