H31-341_V2.5 · Question #907
Linear MSP (LMSP) has two modes: 1+1 and 1:1. Additional services can only be configured for the protection channel in the 1:1 mode of LMSP.
The correct answer is A. True. Option A is correct because in 1:1 LMSP, the protection channel is normally idle - it only activates when the working channel fails. This idle capacity can be used to carry lower-priority "extra traffic" (additional services), which are preempted and dropped if a protection…
Question
Linear MSP (LMSP) has two modes: 1+1 and 1:1. Additional services can only be configured for the protection channel in the 1:1 mode of LMSP.
Options
- ATrue
- BFalse
How the community answered
(49 responses)- A76% (37)
- B24% (12)
Explanation
Option A is correct because in 1:1 LMSP, the protection channel is normally idle - it only activates when the working channel fails. This idle capacity can be used to carry lower-priority "extra traffic" (additional services), which are preempted and dropped if a protection switch occurs.
Option B is wrong because it would imply either that additional services are not supported in 1:1 mode, or that they are supported in 1+1 mode - both of which are false.
In 1+1 mode, the same traffic is broadcast simultaneously on both the working and protection channels at all times, so the protection channel has zero spare capacity and cannot carry any additional services.
Memory tip: Think of 1:1 as "one or the other" - since the protection channel sits unused during normal operation, there's room for extras. In 1+1, both channels are always busy carrying identical traffic, so there's no room for anything else.
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