CCNP|CCDP Remote Access (642-821) practice questions: ISDN BRI

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Q4. What is the total bit rate of ISDN BRI service, including framing and synchronization?

A. 128Kbps

B. 144 Kbps

C. 192 Kbps

D. 1.544 Mbps

Correct Answer: C

Explanation:

The total bandwidth of an ISDN BRI can be calculated as below:
2 B (Bearer) channels: 2X64 = 128 Kbps
1 D (Data) channel: 16Kbps
Framing and Synchronization: 48 Kbps
Total bandwidth: 128+16+48 = 192 Kbps.
Also, note that the bandwidth excluding framing and synchronization is 128+16 Kbps -= 144 Kbps.

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