Question

Automatic protection switching in linear network is defined at the _______

(a) line layer

(b) section layer

(c) photonic layer

(d) path layer

The question was asked in class test.

The question is from SONET topic in portion Wireless LAN’s, Electronic Mail and File Transfer of Computer Network

Answer 1

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.