ZyXEL Communications IES-1248-71, User Manual

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Chapter 55 ADSL Commands
IES-1248-71/73 User’s Guide
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This command sets the upstream (us) and downstream (ds) impulse noise protection minimum
setting on the specified ADSL 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 ADSL 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 ADSL port 5.
55.1.18 Annex L Enable Command
This command is available for the IES-1248-71.
Syntax:
ras> adsl annexl enable <portlist>
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).
The following example turns on the Annex L feature for port 5.
Figure 246 Annex L Enable Command Example
55.1.19 Annex L Disable Command
This command is available for the IES-1248-71.
Syntax:
ras> adsl annexl disable <portlist>
This command turns off the Annex L reach extended feature on the specified ADSL2 port(s).
The following example turns off the Annex L feature for port 5.
Figure 247 Annex L Disable Command Example
<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 245 Impulse Noise Protection Command Example
ras> adsl inp 5 2 1
ras> adsl annexl enable 5
ras> adsl annexl disable 5