H19-410_V1.0 · Question #236
TDM signal formats include (). (Multiple Choice)
The correct answer is A. STM-4:622K B. STM-64:10G C. STM-1:155M D. STM-16:2.5G. All four options are correct because they represent the standard SDH (Synchronous Digital Hierarchy) TDM signal formats, which are a foundational part of the STM (Synchronous Transport Module) hierarchy. STM-1 operates at 155.52 Mbps (155M), STM-4 at 622.08 Mbps (622M), STM-16…
Question
TDM signal formats include (). (Multiple Choice)
Options
- ASTM-4:622K
- BSTM-64:10G
- CSTM-1:155M
- DSTM-16:2.5G
How the community answered
(28 responses)- A100% (28)
Explanation
All four options are correct because they represent the standard SDH (Synchronous Digital Hierarchy) TDM signal formats, which are a foundational part of the STM (Synchronous Transport Module) hierarchy. STM-1 operates at 155.52 Mbps (155M), STM-4 at 622.08 Mbps (622M), STM-16 at 2.488 Gbps (2.5G), and STM-64 at 9.953 Gbps (~10G) - each level is exactly 4× the rate of the previous one. Since this is a "select all that apply" question with no incorrect distractors, every option describes a real, standardized TDM signal level used in telecommunications networks. Note that option A likely contains a typo ("622K" should read "622M"), but the STM-4 level itself is valid and well-established.
Memory tip: Use the "×4 ladder" - start at STM-1 (155M) and multiply by 4 at each rung: ×4 = STM-4 (622M) → ×4 = STM-16 (2.5G) → ×4 = STM-64 (10G). The STM number and the bandwidth both scale together, making it easy to reconstruct the whole table from a single anchor.
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