Amendment 1 to Recommendation ITU-T G.9903 (2012) contains:
� The support for an optional coherent mode for use in CENELEC bandplans.
� Support for a new bandplan in CENELEC B.
� A Regional Annex for Japan (Annex K)
� A new routing algorithm (LOADng) that replaces the old one (LOAD).
� A clause on coexistence with other NB-PLC technologies.
� Various clarifications and corrections including CFA, Header Compression, and channel access mechanism.
� A major editorial restructuring.