Chapter 29 port Commands
Management Switch Card User’s Guide
828
This command configures ITU-T G.988.4’s improved impulse noise protection settings on a VDSL
connection.
The following example sets the upstream G.inp impulse noise protection at 1 DMT symbol on traffic
on port 5 on the VDSL card in slot 4.
29.41.7 port vdsl inm Command
Syntax:
port vdsl inm <slot-port> xtuc|xtur [eim <eim>] [ccp <ccp>] [iato <iato>] [iats
<iats>] [isdb <isdb>]
where
mindelay =
Specify the minimum number of milliseconds (0~63) of retransmission delays. It is
recommended that you configure the same delays for both upstream and
downstream.
inpmin =
Specify the minimum impulse noise protection (INP) against SHINE, 0~31 in units
of 0.5 DMT symbols.
inpminre
in
=
Specify the minimum impulse noise protection (INP) against Repetitive Electrical
Impulse Noise (REIN), 0~7 in units of 0.5 DMT symbols.
This is the number of consecutive DMT symbols corrupted by REIN for which errors
can be completely corrected by the retransmission function, regardless of the
number of errors within the errored DMT symbols. A higher symbol value provides
higher error correction capability, but it causes overhead and higher delay which
may impact multimedia data receiving quality.
reinfreq =
REIN impulse noise is commonly caused by electrical power cables and thus repeats
at a rate of twice the AC power frequency (100 or 120 Hz). Select 5 for 100 Hz or 6
for 120 Hz.
rtxmode =
retransmission mode for G.inp, 0~3
This setting controls activation of G.988.4 G.inp retransmission during initialization.
0: G.inp retransmission not allowed.
1: G.inp retransmission enabled if supported by the far-end.
2: require the system to use G.inp retransmission. Initialization fails if the CPE is
not set to support G.inp retransmission in the same direction.
3: require the system to use G.inp retransmission in test mode when triggered by
the presence of stationary noise. Initialization fails if the CPE is not set to support
G.inp retransmission in the same direction.
ras> port vdsl ginp inpmin 4-5 us-inp 2
xtuc =
Set parameters for downstream transmissions.
xtur =
Set parameters for upstream transmissions.
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