Vdsl2 Line Profile Setup > Mib Psd Mask - ZyXEL Communications MSC1000G User Manual

Table 161 Profile > VDSL2 > LineProfile > Rate Adaptive (continued)
LABEL
Up-Shift SNR
Up-Shift Time
Down-Shift SNR
Down-Shift Time
SOS Time
SOS CRC
SOS NTone
SOS Max
ROC SNR
ROC Min INP
ROC Mode
Dynamic Depth
Mode
Apply
Cancel
Clear
11.7.3 VDSL2 Line Profile Setup > MIB PSD Mask
Click the Modify link next to the MIB PSD MASK field in the VDSL2 Line Profile Setup screen to
open the screen as shown next. Use this screen to adjust PSD levels for tones based on the scope
down the limit PSD mask you have configured.
Management Switch Card User's Guide
DESCRIPTION
Enter the number of decibels (in 0.1 dB) for the line's up-shift SNR margin threshold.
When the line's signal-to-noise margin goes above this number, the system attempts to
use a higher transmission rate.
Enter the number of seconds to wait before using a higher transmission rate when the
line's SNR margin is over the up-shift SNR margin threshold.
Enter the number of decibels (dB) for the line's down-shift SNR margin threshold. When
the line's signal-to-noise margin goes below this number, the system attempts to use a
lower transmission rate.
Enter the number of seconds to wait before using a lower transmission rate when the
line's SNR margin is less than the down-shift SNR margin threshold.
Set the period of milliseconds over which to monitor the SOS CRC and SOS NTone for
triggering the use of the SOS emergency transmission rate. The system starts using
SOS if the SOS CRCs and SOS NTones both exceed their configured limits during the
SOS time window.
Set the number of CRC errors allowed to occur inside the SOS Time window.
Set the percentage of degraded tones allowed to occur inside the SOS Time window.
Set the maximum number of successful SOS procedures allowed within 120 seconds
before the system triggers a full re-initialization.
Enter the number of decibels (dB) for the line's Robust Overhead Channel SNR margin
threshold. If ROC Mode is set to Enable, the system adds this extra margin to the
Target SNR Margin for the ROC tones.
Specify the level of impulse noise (burst) protection to apply when using the Robust
Overhead Channel.
This is the number of consecutive DMT symbols that can be completely corrected. A
higher symbol value provides higher error correction capability, but it causes overhead
and higher delay which may impact multimedia data receiving quality.
Turn the use of the ROC on or off.
Enable dynamic depth mode to have the system automatically change the interleave
depth (amount of error correction) based on the line's noise levels.
Click Apply to save the changes in this screen to the system's volatile memory. The
system loses these changes if it is turned off or loses power, so use the Config Save
link on the navigation panel and then the Save button to save your changes to the non-
volatile memory when you are done configuring.
Click Cancel to reset the fields to your previous configuration.
Click Clear to return to the previous screen.
Chapter 11 Profile Screens
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