1.

Automatic protection switching in linear network is defined at the _______(a) line layer(b) section layer(c) photonic layer(d) path layer

Answer» Right option is (a) line layer

To elaborate: The Line layer in SONET operates like the data link layer in the OSI model and it is responsible for the movement of signal across a physical line. The Synchronous Transport Signal Mux/Demux and Add/Drop Mux provide the Line layer functions.


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