Multiple choice networking

What is the total bandwidth of an ISDN BR1 line (in Kbps)?

  1. 144

  2. 16

  3. 64

  4. 128

  5. 256
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A Correct answer
Explanation

An ISDN Basic Rate Interface (BRI) line consists of two 64 Kbps B-channels (for data) and one 16 Kbps D-channel (for signaling). The total raw bandwidth is 64 + 64 + 16 = 144 Kbps. 128 Kbps is the usable data capacity, but 144 is the total line bandwidth.

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