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Diagram illustrates the architecture of Wide Area Networks (WAN) and Metropolitan Area Networks (MAN). It depicts Layer 1 utilizing DWDM technology for core connectivity, and Layer 2+ showcasing core network elements.

This is a railway communication network. It incorporates SDH technology at various levels, including 2.5G/10G SDH at the backbone layer, 622M/2.5G at the intermediate layer, and 155M SDH at the access layer.