This Supplement summarizes, in clause 2: the Full Service Access Network [FSAN] and ITU-T optical access systems power savings survey results; the principles and targets set by the Code of conduct on energy consumption of broadband communication equipment ([BBCoC v8.0]), and optical access system power savings requirement profiles. Clauses 3, 4 and 5 specify the proposed power-saving techniques partitioned by their relation to the GPON transmission convergence (GTC) layer into the following groups:

– techniques involving introduction of physical layer operation, administration and maintenance (PLOAM) messages or embedded operation, administration and maintenance (OAM) fields;

– techniques involving changing the semantics of existing PLOAM messages or embedded OAM) fields;

– one-sided techniques that avoid changes to the GTC layer.

NOTE – The "fast sleep" method has been renamed "Cyclic Sleep" and later simplified into a single "Watchful Sleep"; initial concepts have been kept.

Clause 6 analyses comparatively the proposed techniques with respect to the specified requirements and clause 7 presents conclusions.