ZyXEL Communications MSC1000G Series, User Manual

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Chapter 11 Profile Screens
Management Switch Card User’s Guide
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11.8 Configured Versus Actual SHDSL Rates
You configure the maximum and minimum rates of individual SHDSL ports using the set profile
command. However, due to noise and other factors on the line, the actual rate may not reach the
maximum that you specify.
Even though you can specify arbitrary numbers in the set profile command, the actual rate is
always a multiple of 64 Kbps. If you enter a rate that is not a multiple of 64 Kbps, the actual value
will be the next lower multiple of 64Kbps. For instance, if you specify 2100 Kbps for a port, the
actual value will be 2048 Kbps, and if you specify 2120 Kbps, the actual value will be 2112 Kbps.
Note that when you configure a SHDSL profile, the upstream and downstream speeds are the
same. The minimum rate must be less than or equal to the maximum rate.
11.9 N-wire Mode
The n-wire mode allows you to physically bundle two SHDSL ports into a single 4-wire connection.
The 4-wire mode is described in ITU-T G.991.2. You can use it to connect to SHDSL modems or
routers that also support 4-wire mode. N-wire mode also allows you to physically bundle four
SHDSL ports into a single 8-wire connection. The 8-wire group is called mpair4.
ISDD Sensitivity
[-128~127] The Indication of Severely Degraded Data (ISDD) sensitivity is a Broadcom proprietary
parameter that provides an extension to the standard to allow you to adjust the Impulse
Noise Sensor sensitivity.
• The ISDD range is -12.8 dB to 12.7 dB in 0.1 dB steps (use -128~127).
• Use the nominal 0 dB value to use the same threshold used to declare a degraded
symbol, that is a symbol marked as erased.
• Use a positive value to indicate by how many to dB to increase the nominal threshold.
This makes the sensor less sensitive and means fewer symbols will be considered
degraded.
• Use a negative value to indicate by how many to dB to decrease the nominal
threshold. This makes the sensor more sensitive and means more symbols will be
considered degraded.
Apply 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.
The new or modified entry then displays in the summary table below.
New While you are modifying a profile, you can click New to start configuring a fresh profile
without saving your changes.
Cancel Click Cancel to start configuring the screen again.
Index This is the number of a VDSL2 INM profile.
Name This field displays the descriptive name of a profile.
Modify Select a profile’s Select radio button and click Modify to edit the profile.
Delete Select a profile’s Select radio button and click Delete to remove the profile.
Table 167
Profile > VDSL2 > InmProfile
LABEL DESCRIPTION