VDSL Commands

efm noise-margin

This command sets the noise margin of the selected VDSL port. Use the no form of this command to disable this feature.

Syntax

efm noise-margin[downstream noise margin] [upstream noise margin] no efm noise-margin

downstream noise margin - A measure of the amount of noise that the downstream VDSL line can tolerate before the signal is affected. Range: 0-9

upstream noise margin - A measure of the amount of noise that the upstream VDSL line can tolerate before the signal is affected. Range: 0-9

Default Setting

0 (disabled)

Command Mode

Interface Configuration

Command Usage

When rate adaptation is enabled, (see “efm rate-adapt” on page 4-108)the Signal-to-Noise Ratio (SNR) is an indicator of link quality. The switch itself has no internal functions to ensure link quality. To ensure a stable link, you should add a margin to the theoretical minimum Signal-to-noise ratio (SNR). The table below lists theoretical minimum SNR’s for the VDSL profiles configurable on this switch.

Profile Name

 

Theoretical Minimum Signal-to-Noise Ratio (dB)

 

 

DS1

DS2

 

US1

US2

 

 

 

 

 

 

 

Default

10

 

Not Used

10

 

Not Used

 

 

 

 

 

 

 

A1-02OAG-R1

17

 

Not Used

14

 

Not Used

 

 

 

 

 

 

 

A2-02OAG-R1

20

 

Not Used

14

 

Not Used

 

 

 

 

 

 

 

A3-01OAG-R1

23

 

10

17

 

Not Used

 

 

 

 

 

 

 

A4-01OAG-R1

26

 

20

20

 

Not Used

 

 

 

 

 

 

 

S1-03OAG-R1

17

 

Not Used

20

 

10

 

 

 

 

 

 

 

S2-03OAG-R1

20

 

Not Used

20

 

14

 

 

 

 

 

 

 

S3-00OAG-R1

23

 

10

23

 

20

 

 

 

 

 

 

 

S1-16-16

20

 

10

20

 

17

 

 

 

 

 

 

 

A1-34-11

29

 

20

17

 

14

 

 

 

 

 

 

 

S2-16-16A

20

 

10

20

 

17

 

 

 

 

 

 

 

A2-34-11A

29

 

20

17

 

14

 

 

 

 

 

 

 

A3-25-3

26

 

10

17

 

Not used

 

 

 

 

 

 

 

A4-45-5

32

 

23

17

 

10

 

 

 

 

 

 

 

A5-50-7

35

 

26

23

 

14

 

 

 

 

 

 

 

4-107

Page 253
Image 253
Accton Technology VS4512DC manual Efm noise-margin, Profile Name Theoretical Minimum Signal-to-Noise Ratio dB

VS4512DC, VS4512 specifications

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