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What is Vectoring and Vectoring on Huawei DSLAM Device?
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What is Vectoring and Vectoring on Huawei DSLAM Device?

What is Vectoring and Vectoring on Huawei DSLAM Device?

As mention for Huawei DSLAM device MA5616 MA5600 or MA5600T, many customers will check if it supports vectoring. What is vectoring, and which device and ADSL or VDSL service cards support vectoring? This article will explain and introduce vectoring of Huawei DSLAM.

 

What is Vectoring?

Vectoring is a VDSL2 based technology that uses far-end crosstalk cancellation to increase the line rate. ITU-T released the standard G.993.5 in April 2010. It is used for copper wire VDSL2, and doesn’t involve optical access, ADSL2+ and other DSL technology.

Vectoring mainly eliminates the influence of far-end crosstalk (FEXT) on the line rate, and has no effect on other external source interference. Vectoring technology has emerged as a means of delivering high bandwidth over existing copper infrastructure by extracting more value from it, without investing in an extensive fiber roll-out.

The influence of crosstalk

influence of crosstalk

  • The line rate of VDSL2 depends on the attenuation of the cable and the noise interference, the louder noise on the line under same distance, the higher noise margin must be set, which leads to line rate decreasing.
  • The twisted pair cable was originally designed for telephone voice transmission. Factors such as unshielded, high density of a large number of lines, and differences in high and low frequency coupling determine the existence of crosstalk in twisted-pair cables and affect each other to a certain extent.
  • Crosstalk is interference that caused by signal coupling between wire pairs. It is divided into near-end crosstalk (NEXT) and far-end crosstalk (FEXT). For VDSL2, it uses a frequency band of 0~30MHz and is mainly used for short-distance transmission, that  makes far-end crosstalk (FEXT) be the most main noise interference.
  • Actual measured data shows that crosstalk will reduce the VDSL2 line rate by about 50%.

 

What is the fundamental of Vectoring?

1, Use downlink precoding and uplink joint reception technology to achieve crosstalk cancellation

2, Through interaction between device and CPE, the crosstalk vector information in the line is obtained, and then large-scale and complex real-time matrix calculation (it is The origin of the name Vectoring) is performed to obtain the "inverted" crosstalk and superimpose it on the VDSL2 signal.

3, In the process of data transmission, "inverted" crosstalk and crosstalk in the line cancel with each other, so that the impact of crosstalk on the line is minimized, and access bandwidth is greatly increased.

 crosstalk

 

Vectoring Classified by architecture: BLV SLV and NLV

1, Board level vectoring (BLV)

 Board level vectoring (BLV)

BLV characteristics are as follows:

  • Vectoring processing chip is integrated on one board, the backplane and system architecture remain unchanged;
  • Limited capacity, only supports a one board Vectoring, 24-48 lines;
  • Need new Vectoring user boards.

2, System level vectoring (SLV)

System level vectoring (SLV)

SLV characteristics are as follows:

  • Vectoring processing chip is integrated on one board
  • Large capacity, supports several Vectoring boards, generally less than 200 lines; does not support cross-device Vectoring
  • A high-speed connection is required between the user board and the VP board, and backplane needs to be redesigned
  • Need new backplane, VP board and Vectoring board

3, Node level vectoring

 Node level vectoring

NLV characteristics are as follows:

  • Two SLV devices jointly implement vectoring.
  • An NLV system supports multiple vectoring service boards that totally connect to up to 384 VDSL2 lines.
  • The two SLV devices share data using a high-speed cable. In addition, clock synchronization must be enabled on both devices.

 

Which Huawei DSLAM devices support Vectoring function?

Huawei MA5616 MA5603T MA5600 can support vectoring and vectoring service board, but MA5600 does not support.

To implement vectoring, the device needs to be equipped with boards that support this feature, below is mapping table between the vectoring processing board with other boards.

Product

Board Type

Board Name

Remarks

Corresponding Outdoor Cabinet

MA5603T

Control board

SCUB

SCUN

SCUK

Supports SLV only.

S300

Backplane

H802MABO

None

VP board

H806VPEA

Installed in slot 12 fixedly.

VDSL2 board

H80BVCMM

H80DCCPE

H80DVCPD

H80DVCPE

H80DVCPM

The H80BVCMM board is a 48-channel VDSL2 over POTS access service board.

The H80DCCPE board is a 64-channel VDSL2&POTS Combo Board with built-in splitter.

The H80DVCPD board is a 64-channel VDSL2 over POTS access service board.

The H80DVCPE board is a 64-channel VDSL2 over POTS access service board, equipped with a built-in splitter.

The H80DVCPM board is a 64-channel VDSL2 over POTS access service board.

MA5600T

Control board

SCUB

SCUN

SCUK

Supports SLV only.

N/A

Backplane

H802MABC

H803MABC

None

VP board

H806VPGA

Consistently installed in slot 8 and slot 11.

VDSL2 board

H80BVCMM

H80DCCPE

H80DVCPD

H80DVCPE

H80DVCPM

The H80BVCMM board is a 48-channel VDSL2 over POTS access service board.

The H80DCCPE board is a 64-channel VDSL2&POTS Combo Board with built-in splitter.

The H80DVCPD board is a 64-channel VDSL2 over POTS access service board.

The H80DVCPE board is a 64-channel VDSL2 over POTS access service board, equipped with a built-in splitter.

The H80DVCPM board is a 64-channel VDSL2 over POTS access service board.

MA5616

Control board

H831CCUE

Supports SLV and NLV.

S200/S100

NOTE:

The S200 cabinet is recommended because it supports a maximum of 192 lines. The S100 cabinet supports only 96 lines due to the limitation of heat dissipation.

Daughter board

UP2CA/UP2AA

None

Backplane

H831MABB

None

VP board

H836VPBA

H836VPDA

H836VPBA: A daughter board for SLV; attached to the power board.

H836VPDA: A daughter board for NLV; attached to the power board.

VDSL2 board

H83BVCMM

H83BVCLE

H83BVCLF

H83BVCMM: A 48-channel VDSL2 access service board.

H83BVCLE/H83BVCLF: 32-channel VDSL2 access service board.

Power board

H831PAVDA

H832PDVAA

H832PDNAA

H831PAVDA: An AC power board for SLV.

H832PDVAA: A DC power board for SLV.

H832PDNAA: A DC power board for NLV.