G.993.5 CORR 1-2011

Self-FEXT cancellation (vectoring) for use with VDSL2 transceivers Corrigendum 1 (Study Group 15)


 

 

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标准号
G.993.5 CORR 1-2011
发布日期
2011年06月01日
实施日期
2015年06月23日
废止日期
中国标准分类号
/
国际标准分类号
/
发布单位
ITU-T - International Telecommunication Union/ITU Telcommunication Sector
引用标准
10
适用范围
Vectoring is a transmission method which 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. The scope of this Recommendation is specifically limited to the self-FEXT (far-end crosstalk) cancellation in downstream and upstream directions. This Recommendation 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 VDSL2 transceivers@ not necessarily of the same profile. This recommendation is intended to be implemented in conjunction with G.993.2. Multi-pair digital subscriber line (DSL) bonding (ITU-T Recommendations G.998.1 [B1]@ G.998.2 [B2]@ and G.998.3 [B3]) may be implemented in conjunction with vectoring. The techniques described in this Recommendation provide means of reducing self-FEXT generated by the transceivers in a multi-pair cable or cable binder. Self-FEXT cancellation techniques are particularly beneficial with short cable lengths (less than1 km) and limited near-end crosstalk (NEXT)@ background noise@ and FEXT from systems which are not a part of the vectored group (alien noise). The level of non-self-FEXT noise sources relative to that of self-FEXT sources determines the degree to which self-FEXT reduction can improve performance. Another significant factor is the degree to which the self-FEXT cancelling system has access to the disturbing pairs of the cable. Maximum gains are achieved when the self-FEXT cancelling system has access to all of the pairs of a cable carrying broadband signals. For multi-binder cables@ significant gains are possible when the self-FEXT cancelling system has access to all of the pairs of the binder group(s) in which it is deployed and has the ability to cancel at least the majority of dominant self-FEXT disturbers within the binder. When multiple self-FEXT cancelling systems are deployed in a multi-binder cable without binder management@ gains may be significantly reduced.




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