OTM nr.m consists of at most "n" optical multiplexing channels. Non-channel related overhead is not supported. The letter "r" indicates reduced functionality.

Question

Options

• ATrue
• BFalse

• A
  74% (40)
• B
  26% (14)

Explanation

Option A is correct because the ITU-T G.709 standard defines OTM-nr.m precisely this way: "n" specifies the maximum number of optical channel (OCh) multiplexing slots supported, "m" indicates the optical interface bit rate class, and the suffix "r" explicitly denotes reduced functionality - meaning the OTM-nr.m variant omits non-associated (non-channel-related) overhead such as the OMS and OTS overhead layers that the full OTM-n.m supports. All three claims in the statement - the "n" channel limit, the absence of non-channel overhead, and the "r" meaning reduced functionality - are individually and collectively accurate per the standard. Option B is wrong because there is no inaccuracy in the statement; every element of the notation is correctly described. Memory tip: Think of the "r" in OTM-nr.m as "reduced = removed overhead" - the reduced variant strips out the optical section layers and keeps only the per-channel (OCh) structure, which is why non-channel overhead is absent.

No community discussion yet for this question.