2ME multipath protection, how long is service interruption time?

Question

Options

• AAbout 30ms
• BAbout 100ms
• CAbout 200ms
• D0

• A
  72% (21)
• B
  14% (4)
• C
  7% (2)
• D
  7% (2)

Explanation

Option A (~30ms) is correct because 2ME (dual-path/multipath) protection switching is designed to meet the industry-standard fast protection requirement of under 50ms, with typical implementations achieving approximately 30ms switchover time - fast enough that most real-time services (voice, video) experience negligible degradation.

Option B (100ms) is incorrect because it exceeds the <50ms protection switching threshold defined in ITU-T standards (such as G.841/G.8031), which would cause noticeable service disruption. Option C (200ms) is far too slow and is more characteristic of unprotected fault recovery or manual intervention, not automatic protection switching. Option D (0ms) is physically impossible - even a hitless switchover requires a finite amount of time for fault detection, decision logic, and path switching.

Memory tip: Think of the "30ms rule" as analogous to a traffic light: fast protection switching (~30ms) is like an instant green reroute - under the 50ms threshold that human perception and most real-time protocols tolerate without noticeable impact.

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