The present document specifies requirements for transceivers that provide very high bit-rate digital transmission on metallic, unshielded, access network wire pairs. The technology is referred to as Very high speed Digital Subscriber Line (VDSL).

This present document is part 2 of the specification for VDSL and is applicable to metallic access transmission systems designed to provide multi-megabit/s digital access over part of the existing, unshielded, metallic access network. It is concerned with the specification of the line-code and duplex method which enable the requirements stated in TS 101 270-1 to be met.

The present document allows the VDSL transceiver to be implemented using either Single Carrier or Multi-Carrier modulation schemes.