The networking architectures supported by SDH equipment include (). (Multiple Choice)

Question

Options

• AStar structure
• BRing structure
• CChain structure
• DNetwork structure

• A
  100% (62)

Explanation

All four options are correct because SDH (Synchronous Digital Hierarchy) equipment is specifically designed to be topology-agnostic - its multiplexing, add-drop, and cross-connect capabilities allow deployment in star, ring, chain (linear), and mesh (network) topologies. There are no distractors here; this is a "select all that apply" question where every option is valid.

• Star: A central ADM (Add-Drop Multiplexer) or DXC (Digital Cross-Connect) hub connects to multiple remote nodes, common in hub-and-spoke access networks.
• Ring: The most iconic SDH topology, using Multiplex Section Protection (MSP) or Subnetwork Connection Protection (SNCP) rings for automatic fault recovery in under 50 ms.
• Chain (linear): Nodes are daisy-chained point-to-point, typically used in long-haul backbone links or access networks where ring closure isn't practical.
• Network (mesh): Multiple interconnected nodes with DXCs at key points, offering maximum path diversity and resilience for core transport networks.

Memory tip: Think of SDH as a "universal framework" - the letters S-D-H can remind you it supports Star, Daisy-chain, and Hub-and-ring topologies, with mesh thrown in for completeness. When you see an SDH topology question, lean toward "all of the above" unless a specific topology is clearly excluded.

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