How is UPSR and BLSR traffic rerouted during a protection switch when a complete fiber cable cut occurs?（）

A、Traffic is switched from the first node receiving the AIS indication.

B、Traffic is switched from the far side of the failure, allowing handshaking to occur.

C、UPSR traffic is switched from the terminating node, BLSR traffic is rerouted from the originating node in the ring.

D、UPSR traffic is switched from the terminating node, circuit by circuit. BLSR traffic is rerouted from the last reachable node in the ring.

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第1题

[] Why is an OC-3 2F-BLSR not feasible?（）

A、A. Switch times would exceed 50 ms for an OC-3 BLSR ring. B、B. An equal amount of working and protect bandwidth is required. C、C. DCC bandwidth is not large enough to handle K1/K2 processing. D、D. There is not enough bandwidth in an OC-3 ring to justify BLSR protection.

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第2题

[单选题] UPSR protection switching is initiated by （）, while BLSR is initiated by （）.

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第4题

[单选题] You are provisioning a DS-1 circuit on an ONS 15454 UPSR configuration and XC-10G card. How many total VT ports are used within the VT matrix at the source node?（）

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