Summary

This ITU-T Recommendation, "1+1 protection switching for cell-based Physical Layer", provides architecture and mechanisms for 1+1 protection at the Physical Layer for ATM cell-based transmission systems.

This ITU-T Recommendation defines the transmitter and receiver operation, the synchronization and switching process. It is based on the mechanisms described in ITU-T Recommendation I.432.2 for ATM cell-based transmission systems.

It provides hitless protection switching at the Physical Layer between two sources and sinks of F3 OAM flows.