G.993.5 (02/2019) - ITU-T Recommendation Database

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ITU-T G.993.5 (02/2019) عربي | 中文 | English | Español | Français | Русский Self-FEXT cancellation (vectoring) for use with VDSL2 transceivers Vectoring is a transmission method that employs the coordination of line signals for reduction of crosstalk levels and improvement of performance. The degree of improvement depends on the channel characteristics. Vectoring may be for a single user or for multiple users' benefit. Recommendation ITU-T G.993.5 is specifically limited to the self-far-end crosstalk (self-FEXT) cancellation in the downstream and upstream directions. It defines a single method of self-FEXT cancellation, in which FEXT generated by a group of near-end transceivers and interfering with the far-end transceivers of that same group is cancelled. This cancellation takes place between very high-bit-rate digital subscriber line 2 (VDSL2) transceivers, not necessarily of the same profile. This Recommendation is intended to be implemented in conjunction with Recommendation ITU‑T G.993.2. This version of this Recommendation integrates all of the previous amendments and corrigenda with the 2015 version 2.0 of Recommendation ITU-T G.993.5. This version of Recommendation ITU-T G.993.5 corrects or adds the following functionality: – Typographical correction in clause 8.2 (Corrigendum 1) – Generalization of the segmentation of SOC messages in clause 10.4.2.2 for vectoring of profile 35b (Corrigendum 1) – Transceiver O-DEACTIVATING state (Amendment 1) – Annex A: Mitigating strong FEXT (Amendment 2) – Annex B: Vectored Long Reach VDSL2 (Amendment 2) – Encoding of R-P-VECTOR-2 in LR mode with long loop operation (Annex B) (Corrigendum 2) – Long reach VDSL2 corrigendum related to MAXNOMATP (new). Citation: https://handle.itu.int/11.1002/1000/13748 Series title: G series: Transmission systems and media, digital systems and networks G.900-G.999: Digital sections and digital line system G.990-G.999: Metallic access networks Approval date: 2019-02-22 Provisional name: G.vector Approval process: AAP Status: In force Maintenance responsibility: ITU-T Study Group 15 Further details: Patent statement(s) Development history EditionsRelated Supplement(s)Related technical papers and reports Ed. ITU-T Recommendation Status Summary Table of Contents Download 3.1 G.993.5 (2019) Cor. 1 (03/2020) In force here here here 3 G.993.5 (02/2019) In force here here here 2.4 G.993.5 (2015) Cor. 2 (03/2018) Superseded here here here 2.3 G.993.5 (2015) Amd. 2 (12/2017) Superseded here here here 2.2 G.993.5 (2015) Amd. 1 (12/2016) Superseded here here here 2.1 G.993.5 (2015) Cor. 1 (11/2016) Superseded here here here 2 G.993.5 (01/2015) Superseded here here here 1.7 G.993.5 (2010) Amd. 5 (04/2014) Superseded here - here 1.6 G.993.5 (2010) Amd. 4 (08/2013) Superseded here here here 1.5 G.993.5 (2010) Amd. 3 (04/2013) Superseded here - here 1.4 G.993.5 (2010) Amd. 2 (10/2012) Superseded here - here 1.3 G.993.5 (2010) Cor. 2 (06/2012) Superseded here - here 1.2 G.993.5 (2010) Amd. 1 (12/2011) Superseded here - here 1.1 G.993.5 (2010) Cor. 1 (06/2011) Superseded here - here 1 G.993.5 (04/2010) Superseded here here here ITU-T Supplement Title Status Summary Table of contents Download G Suppl. 4 (12/1972) Certain methods of avoiding the transmission of excessive noise between interconnected systems In force - - here G Suppl. 5 (10/1984) Measurement of the load of telephone circuits under field conditions In force - - here G Suppl. 7 (12/1972) Loss-frequency response of channel-translating equipment used in some countries for international circuits In force here here here G Suppl. 8 (12/1972) Method proposed by the Belgian telephone administration for interconnection between coaxial and symmetric pair systems In force - - here G Suppl. 17 (10/1984) Group-delay distortion performance of terminal equipment In force - - here G Suppl. 19 (10/1984) Digital crosstalk measurement (method used by the Administrations of France, the Netherlands and Spain) In force - - here G Suppl. 22 (10/1984) Mathematical models of multiplex signals In force - - here G Suppl. 26 (10/1984) Estimating the signal load margin of FDM wideband amplifier equipment and transmission systems In force - - here G Suppl. 27 (10/1984) Interference from external sources In force - - here G Suppl. 28 (10/1984) Application of transmultiplexers, FDM codecs, data-in-voice (DIV) systems and data-over-voice (DOV) systems during the transition from an analogue to a digital network In force - - here G Suppl. 32 (11/1988) Transfer of alarm information on 60-channel transmultiplexing equipment In force - - here G Suppl. 34 (11/1988) Temperature in underground containers for the installation of repeaters In force - - here G Suppl. 35 (11/1988) Guidelines concerning the measurement of wander In force - - here G Suppl. 36 (11/1988) Jitter and wander accumulation in digital networks In force - - here G Suppl. 39 (10/2025) Optical system design and engineering considerations In force here here here G Suppl. 40 (07/2024) Optical fibre and cable Recommendations and standards guideline In force here here here G Suppl. 41 (07/2024) Design guidelines for optical fibre submarine cable systems In force here here here G Suppl. 42 (10/2018) Guide on the use of the ITU-T Recommendations related to optical fibres and systems technology In force here here here G Suppl. 43 (02/2011) Transport of IEEE 10GBASE-R in optical transport networks (OTN) In force here here here G Suppl. 44 (06/2007) Test plan to verify B-PON interoperability In force here here here G Suppl. 45 (09/2022) Power conservation in optical access systems In force here here here G Suppl. 46 (05/2009) G-PON interoperability test plan between optical line terminations and optical network units In force here here here G Suppl. 47 (03/2025) General aspects of optical fibres and cables In force here here here G Suppl. 48 (06/2010) 10-Gigabit-capable passive optical networks: Interface between media access control with serializer/deserializer and physical medium dependent sublayers In force here here here G Suppl. 49 (09/2020) Rogue optical network unit (ONU) considerations In force here here here G Suppl. 50 (09/2011) Overview of digital subscriber line Recommendations In force here here here G Suppl. 51 (06/2017) Passive optical network protection considerations In force here here here G Suppl. 52 (09/2012) Ethernet ring protection switching In force here here here G Suppl. 53 (12/2014) Guidance for Ethernet OAM performance monitoring In force here here here G Suppl. 54 (07/2015) Ethernet linear protection switching In force here here here G Suppl. 55 (10/2025) Radio-over-fibre (RoF) technologies and their applications In force here - here G Suppl. 56 (02/2016) OTN transport of CPRI signals In force here here here G Suppl. 57 (07/2015) Smart home profiles for 6LoWPAN devices In force here here here G Suppl. 58 (07/2024) Optical transport network module framer interfaces In force here here here G Suppl. 59 (02/2018) Guidance on optical fibre and cable reliability In force here here here G Suppl. 60 (09/2016) Ethernet linear protection switching with dual node interconnection In force here here here G Suppl. 62 (02/2018) Gfast certification In force here here here G Suppl. 64 (02/2018) PON transmission technologies above 10 Gb/s per wavelength In force here here here G Suppl. 65 (10/2018) Simulations of transport of time over packet networks In force here here here G Suppl. 66 (09/2020) 5G wireless fronthaul requirements in a passive optical network context In force here here here G Suppl. 67 (07/2019) Application of optical transport network Recommendations to 5G transport In force here here here G Suppl. 68 (10/2025) Synchronization operations, administration and maintenance requirements In force here - here G Suppl. 69 (09/2020) Migration of a pre-standard network to a metro transport network In force here here here G Suppl. 70 (09/2020) Supplement on sub 1 Gbit/s services transport over optical transport network In force here here here G Suppl. 71 (12/2023) Optical line termination capabilities for supporting cooperative dynamic bandwidth assignment In force here here here G Suppl. 72 (03/2025) Modelling consideration for optical media networks In force here here here G Suppl. 73 (10/2021) Influencing factors on quality of experience for multiview video (MVV) services In force here here here G Suppl. 74 (12/2021) Network slicing in a passive optical network context In force here here here G Suppl. 75 (12/2021) 5G small cell backhaul/midhaul over TDM-PON In force here here here G Suppl. 76 (12/2021) Optical transport network security In force here here here G Suppl. 77 (06/2022) Supplement 77 to ITU-T G-series of Recommendations - Influencing factors on quality of experience (QoE) for video customized alerting tone (CAT) and video customized ringing signal (CRS) services In force here here here G Suppl. 78 (09/2022) Use case and requirements of fibre-to-the-room for small business applications In force here here here G Suppl. 79 (12/2023) Latency control and deterministic capability over a PON system In force here here here G Suppl. 80 (07/2024) Use case and requirements of fibre-based in-premises networking for home application (FIP4H) In force here here here G Suppl. 81 (10/2025) Practical aspects of PON security - Revision 1 In force here here here G Suppl. 82 (07/2024) Enhanced optical line termination with information technology functions In force here here here G Suppl. 83 (10/2025) Supplement on the use of options in the precision time protocol profile with full timing support from the network In force here - here G Suppl. 84 (03/2025) Operational aspects of optical access In force here here here G Suppl. 85 (03/2025) FgODUflex over point-to-multipoint networks In force here here here G Suppl. 86 (03/2025) Fibre to the power grid (FTTGrid) use cases and network requirements In force here here here G Suppl. 87 (03/2025) Standardization framework for optical fibres for space division multiplexing In force here here here G Suppl. 88 (10/2025) Point to multipoint passive optical access system requirements and transmission technologies above 50 Gbit/s per wavelength In force here - here G Suppl. 89 (10/2025) Coordinated management of access and fibre in premises networks In force here - here G Suppl. 90 (10/2025) Coexistence between G.fin and G.Xfin systems In force here - here G Suppl. 91 (10/2025) Use cases and requirements of fibre-in-premises for small and medium enterprise applications In force here here here G Suppl. 92 (10/2025) Synchronization for data centres In force here here here Title Approved on Download Roadmap for QoS and QoE in the ITU-T Study Group 12 context (TR-RQ) 2023 here Considerations on the use of GNSS as a primary time reference in telecommunications 2020 here Use of G.hn in industrial applications 2020 here DSL story 2010 here ISDN field trial guidelines 1991 here

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