BelAir Networks BelAir 100SN, Руководство пользователя

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BelAir100SN User Guide Cable Modem Configuration
May 31, 2010 Confidential Page 72 of 212
Document Number BDTM11001-A01 Released
As with manual attenuation, automatic attenuation can vary the attenuation
level from 0 to 20 dB, in 1 dB steps.
If you want to use automatic attenuation, but with different target and in-lock
values than those in the DOCSIS 3.0 specification, use the
parameters
parameter to specify the new values. The
target
parameter specifies the new
target attenuation value. The
delta
parameter specifies the margin of
attenuation on each side of the target to be considered in-lock. The default
values are:
• For upstream, the default target is 45 dB with a delta of 5 dB, meaning that
the in-lock range is from 40 dB to 50 dB.
• For downstream, the default target is 0 dB with a delta of 7 dB, meaning that
the in-lock range is from -7 dB to + 7dB.
The acceptable input values for
<target_val>
and
<delta_val>
for upstream
are:
•
<target_val>
+
<delta_val>
cannot exceed 50 dB
•
<target_val>
-
<delta_val>
cannot be less than 20 dB
The acceptable input values for
<target_val>
and
<delta_val>
for downstream
are:
•
<target_val>
+
<delta_val>
cannot 15 dB
•
<target_val>
-
<delta_val>
cannot be less than -15 dB
After configuring attenuation, use the
/card/cm-<n>/show status attenuation
command to verify that the power levels are within their proper operating
ranges.
Rebooting the
Cable Modem
/card/cm-<n>/reboot [set-default]
Use this command to reboot the cable modem. Use the
set-default
parameter
to return the cable modem settings to factory defaults.