1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Reference models
5.1 General
5.2 Downstream vectoring
5.3 Upstream vectoring
6 CO-side requirements in a vectored group
6.1 General
6.2 Downstream vectoring requirements for the VTU-O
6.3 Upstream vectoring requirements for the VTU-O
6.4 Requirements for the VCE
7 CP-side requirements in a vectored group
7.1 General
7.2 Downstream vectoring requirements for the VTU-R
7.3 Upstream vectoring requirements for the VTU-R
7.4 Requirements for the NT system
8 Vectoring-specific eoc messages
8.1 eoc messages for backchannel configuration
8.2 Pilot sequence update command and response
8.3 Power management commands and responses
9 Activation and deactivation of pairs in a vectored group
9.1 Orderly shutdown event
9.2 Disorderly shutdown event
10 Initialization of a vectored group
10.1 Overview
10.2 ITU-T G.994.1 Handshake phase
10.3 Channel Discovery phase
10.4 Training phase
10.5 Channel Analysis and Exchange phase
10.6 Transition from initialization to Showtime
10.7 Loop diagnostic mode procedures
11 Configuration and test parameters
11.1 Configuration parameters
11.2 Test parameters
Annex A – Mitigating strong FEXT
A.1 Introduction
A.2 Control parameters for the minimum
message overhead data rate (amends clause 9.5.4 of [ITU-T G.993.2])
A.3 Clipped error samples
A.4 OLR commands
A.5 ITU‑T G.994.1 Handshake phase (amends clause 10.2)
A.6 TIGAV functionality
A.7 Main body amendments related to MREFPSD
A.8 Management
Annex B – Vectored long reach VDSL2
B.1 Introduction
B.2 Overview of the initialization procedure
B.3 ITU-T G.994.1 Handshake phase
B.4 Signals sent by the VTU‑O during the Channel Discovery
and Training phase
B.5 Signals sent by the VTU‑R during the Channel Discovery
and Training phase
B.6 O/R‑P‑PROBING‑LR signal exchange
B.7 O/R‑P‑TRAINING‑LR signal exchange
B.8 ITU-T G.993.5 Channel Discovery phase and Training phase in
long loop operation
B.9 Definition of limit PSD masks
B.10 Management
B.11 Nominal aggregate transmit power (NOMATP) (replaces clause
10.3.4.2.1 of [ITU‑G.993.2])
Appendix I – Crosstalk channel modelling
I.1 Scope
I.2 Purpose
I.3 MIMO crosstalk channel model A
I.4 MIMO crosstalk channel model C
Appendix II – Examples of VCE control of initialization process in the
activation of multiple lines in the vectored group
II.1 Introduction
II.2 VCE handling two groups of initializing lines
II.3 VCE using handshake capabilities
Appendix III – SNR-based FEXT channel estimation method
III.1 Tools
III.2 Estimation of FEXT channels from a new line into existing lines
Page
III.3 Estimation of FEXT channels from
existing lines into a new line
Bibliography