350-029 · Question #183
For SONET ring switching, the 50ms switch time: Select all that apply
The correct answer is B. Applies to rings smaller than 1200km D. Includes up to 16 nodes. APS protection switching has always been known for its recovery speed. SONET defines a maximum switch time of 50 milliseconds for a BLSR ring with no extra traffic and less than 1200 km of fiber. The specifications actually state 60 milliseconds, with 10 ms for discovery of the…
Question
For SONET ring switching, the 50ms switch time: Select all that apply
Options
- APlncludes the detection time
- BApplies to rings smaller than 1200km
- CApplies to rings smaller than 1000km
- DIncludes up to 16 nodes
How the community answered
(53 responses)- A11% (6)
- B83% (44)
- C6% (3)
Explanation
APS protection switching has always been known for its recovery speed. SONET defines a maximum switch time of 50 milliseconds for a BLSR ring with no extra traffic and less than 1200 km of fiber. The specifications actually state 60 milliseconds, with 10 ms for discovery of the problem and 50 ms to perform the switch, but most people refer to this as just 50 ms. The maximum number of nodes on a BLSR is 16.
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