Respuesta :

Answer:

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.

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Answer:

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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