ZyXEL Communications IES-612-51A User Manual

 Chapter 52 ADSL Commands

IES-612-51A User’s Guide

Syntax: 

  ras> adsl inp <portlist> [<usINP> [,<dsINP>] ]

where

This command sets the upstream (us) and downstream (ds) impulse noise protection minimum 
setting on the specified DSL port(s). Sudden spikes in the line’s noise level (impulse noise) 
can cause errors and result in lost packets. Set the impulse noise protection minimum to have a 
buffer to protect the DSL physical layer connection against impulse noise. This buffering 
causes a delay that reduces transfer speeds. It is recommended that you use a non-zero setting 
for real time traffic that has no error correction (like videoconferencing). 

The following example sets the impulse noise protection minimum to 1 DMT symbols for 
upstream and 0.5 DMT symbols for downstream for DSL port 5.

This command turns on the Annex L reach extended feature on the specified ADSL2 port(s). 
Annex L can be used with Annex A (ADSL over POTS), not Annex B (ADSL over ISDN).

Syntax:

  ras> adsl annexl enable <portlist>

The following example turns on the Annex L feature for port 5.

Figure 235   Annex L Enable Command Example 

This command turns off the Annex L reach extended feature on the specified ADSL2 port(s).

Syntax:

  ras> adsl annexl disable <portlist>

The following example turns off the Annex L feature for port 5.

<usINP>

=

Sets the minimum upstream (us) impulse noise protection setting. 
Use 0~3 to define a number of DMT symbols. 0 = 0 DMT symbols, 
1 = 0.5 DMT symbols, 2 = 1 DMT symbols, 3 = 2 DMT symbols.

<dsINP>

=

Sets the minimum downstream (ds) impulse noise protection 
setting. Use 0~3 to define a number of DMT symbols. 0 = 0 DMT 
symbols, 1 = 0.5 DMT symbols, 2 = 1 DMT symbols, 3 = 2 DMT 
symbols.

Figure 234   Impulse Noise Protection Command Example

ras> adsl inp 5 2 1

ras> adsl annexl enable 5