Huawei SmartAX MA5603T Configuration Manual page 866

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Commissioning and Configuration Guide
Item
Grouping
Policy for activating a
legacy customer
premises equipment
(CPE)
Issue 01 (2014-04-30)
Description
In vectoring network planning, grouping is a key phase. Accurate
grouping cancels inter-line crosstalk to the largest extent and
develops vectoring advantages.
l It is recommended that you learn the actual physical routing
beforehand. Crosstalk between lines in a bundle reaches the
maximum value. Therefore, it is better to plan members in a
vectoring group the same as actual routing.
l If you do not know actual routing in the system, you cannot
group. In this case, you can use the default global grouping.
Then, you can add all lines supporting vectoring to default
vectoring group 1.
A legacy CPE is a VDSL2 CPE that supports G.993.2 but does not
support G.9930.5 or vectoring. If such a CPE is activated by G.
993.2 in the vectoring system, it affects lines and the performance
of the vectoring system deteriorates. Therefore, configure the
policy for activating a vectoring legacy CPE based on site
requirements to reduce the effect to minimum. The system supports
three activation polices. The default policy is limit.
l No-limit: The legacy CPE can be activated in the common
VDSL2 mode. That is, the legacy CPE is activated in the non-
Vectoring mode and the performance of the Vectoring system
is affected. This activation policy is generally used in the initial
stage of Vectoring applications. In this stage, a lot of CPEs need
to be upgraded or replaced and the Vectoring performance is
not mostly concerned.
l Limit: The legacy CPE can be activated in the common VDSL2
mode; however, the line is automatically shaped by power
spectrum density (PSD) and is activated by low-speed VDSL2
to prevent other lines from being affected. This activation
policy is generally used in the medium stage of Vectoring
applications. In this stage, some CPEs are not upgraded or
replaced. This is the system default policy.
l Force-friendly-ds-limit-us: force friendly is used in the
downstream direction and PSD automatic shaping is used in the
upstream direction.
l Force-friendly-ds-no-limit-us: force friendly is used in the
downstream direction and no restriction is used in the upstream
direction.
l Block: The legacy CPE cannot be activated in the common
VDSL2 mode (G.993.2). If a legacy CPE needs to be activated
in G.993.2 mode, you need to delete it from the Vectoring group
first. This activation policy is generally used in the mature stage
of Vectoring applications. In this stage, the Vectoring
performance is concerned and unnecessary crosstalk is better
to be masked.
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