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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.