ZyXEL Communications MSC1000G Series, Руководство пользователя

Страница: 779 / 1168

Chapter 29 port Commands
Management Switch Card User’s Guide
779
This command disables downstream carrier tones from 256 to 511 on the specified ADSL2+
port(s). Use this command to have the system not use an ADSL line’s tones that are known to have
a high noise level.
The following example disables downstream carrier tone 301 for ADSL2+ port 5 on the line card in
slot 7.
The following example disables downstream carrier tones 301 to 304 for ADSL2+ port 5 on the line
card in slot 7.
29.4.10 port adsl inpmin Command
Syntax:
port adsl inpmin < slot-port > < us_inp > < ds_inp >
where
This command sets the minimum upstream (us) and downstream (ds) impulse noise protection
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 2 DMT symbols for upstream
and 4 DMT symbols for downstream for ADSL port 5 on the line card in slot 7.
m4 :
tones 384~415
m5 :
tones 416~447
m6 :
tones 448~479
m7 :
tones 480~511
The hexadecimal digit is converted to binary and a '1' disables the
corresponding tone. Disabling a carrier tone turns it off so the system does not
send data on it.
ras> port adsl dscarrier1 7-5 0 00001000 0 0 0 0 0 0
ras> port adsl dscarrier1 7-5 0 0000f000 0 0 0 0 0 0
< us_inp >
= Sets the minimum upstream (us) impulse noise protection setting. Use 0~6 to
define a number of DMT symbols. 0 = 0, 1 = 0.5, 2 = 1, 3 = 2, 4 = 4, 5 = 8, 6 =
16 DMT symbols
< ds_inp >
=
Sets the minimum downstream (ds) impulse noise protection setting (0~6).
ras> port adsl inpmin 7-5 3 4