Recommendation ITU-T G.994.1 provides a flexible mechanism for digital subscriber line (DSL) transceivers to exchange capabilities and to select a common mode of operation.It includes parameters relating to service and application requirements as well as parameters pertinent to various DSL transceivers.This Recommendation is currently an integral part of the start-up procedure for Recommendations ITU-T G.991.2,ITU-T G.992.1,ITU-T G.992.2,ITU-T G.992.3,ITU-T G.992.4,ITU-T G.992.5,ITU-T G.993.1 and ITU-T G.993.2.It is anticipated that future DSL Recommendations will also be able to make use of this Recommendation.Provisions are also included for exchanging non-standard information.This revision integrates all approved amendments and corrigendum into the latest revision of Recommendation ITU-T G.994.1 (version 3).It also:– fixes the allocation of the codepoint "Support of downstream virtual noise in diagnostic mode"– fixes the allocation of the codepoint "Full ITU-T G.993.5-friendly ITU-T G.993.2 operation"– removes the codepoints for O-P-VECTOR-1-1 duration.
ITU-T G.994.1-2012 Referenced Document
ISO/IEC 3309:1993 Information technology; telecommunications and information exchange between systems; high-level data link control (HDLC) procedures; frame structure
ITU-T G.991.2-2003 Single-pair high-speed digital subscriber line (SHDSL) transceivers Study Group 15*， 2024-04-20 Update
ITU-T G.992.1-1999 Asymmetric Digital Subscriber Line (ADSL) Transceivers - Series G: Transmission Systems and Media Digital Systems and Networks - Digital Transmission Systems - Digital Sections and Digital Line System - Access Networks
ITU-T G.992.2-1999 Splitterless Asymmetric Digital Subscriber Line (ADSL) Transceivers - Series G: Transmission Systems and Media Digital Systems and Networks Digital Transmission Systems - Digital Sections and Digital Line System - Access Networks Study Group 15; 178 pp
ITU-T G.992.3-2005 Asymmetric digital subscriber line transceivers 2 (ADSL2)
ITU-T G.992.4-2002 Splitterless Asymmetric digital subscriber line transceivers 2 (splitterless ADSL2) Series G: Transmission systems and media digital systems and networks Digital sections and digital line system - Access networks Study Group 15
ITU-T G.992.5-2005 Asymmetric Digital Subscriber Line (ADSL) transceivers ?Extended bandwidth ADSL2 (ADSL2+) Study Group 15
ITU-T G.993.1-2004 Very high speed digital subscriber line transceivers (Study Group 15)
ITU-T G.993.2-2006 Very high speed digital subscriber line transceivers 2 (VDSL2) (Study Group 15)
ITU-T T.35-1991 Procedure for the Allocation of CCITT Defined Codes for Non-Standard Facilities (Study Group VIII) 8 pp
ITU-T G.994.1-2012 history
2012ITU-T G.994.1-2012 Handshake procedures for digital subscriber line transceivers (Study Group 15)