ZyXEL Communications AAM1212-51, Руководство пользователя

Страница: 358 / 435

AAM1212-51/53 Series User’s Guide
358 Chapter 52 ADSL Commands
• Stay in the L0 power mode for 180 seconds before a change to the L2 power mode is
permitted.
• Once in L2 power mode, wait for 90 seconds before further reducing the transmission
power.
• Each L2 power mode power reduction can only be 2 dB or less.
• The total power reduction allowed in the L2 power mode is 40 dB.
52.1.17 Impulse Noise Protection Command
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.
52.1.18 Annex L Enable Command
This command is available for the AAM1212-51.
Syntax:
ras> adsl annexl enable <portlist>
Figure 235 PMM Parameters Command Example
ras> adsl pmm param 5 180 90 2 40
<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 236 Impulse Noise Protection Command Example
ras> adsl inp 5 2 1