Release 1.0
Configuring the CMTS
526360-001-00 Rev. B
MGBI
6-57
■
If the upstream input power level is set in
relative
mode, the input power level
changes when the upstream channel width is changed. For example, if the input
power level is +11 dBmV for a DOCSIS 3.2 MHz upstream channel bandwidth
setting in
relative
mode and is changed to 1.6 MHz, the default receive power is
+8 dBmV. The default power levels for the 3.2 MHz and 1.6 MHz channels are
equal
relative
to their respective channel bandwidth settings.
describes how the upstream channel bandwidth corresponds to the input
power-level range and default power-level range for a specific upstream channel.
Setting the Upstream Power Level in Relative Mode
Use the
cable upstream power-level default
command in Interface Configuration
mode to set the upstream input power level in
relative
mode:
MOT
(config-if)#
cable upstream <
NUM
> power-level default
<
offset
>
where:
NUM
is the upstream port number.
offset
is the number expressed in dB above or below the default input power level.
Caution:
If the power level is not explicitly set on the upstream interfaces,
they default to 0 dBmV in absolute mode with a 3.2 MHz, 2560 kilosymbols
per second rate. Ensure that the correct power level is set on each upstream
channel.
Table 6-9 Upstream Input Power Level Range Parameters
Upstream Channel
Bandwidth
Default Power-level
Range
Power-level
Range
200 KHz
-1 dBmV
-16 to +14 dBmV
400 KHz
+2 dBmV
-13 to +17 dBmV
800 KHz
+5 dBmV
-10 to +20 dBmV
1.6 MHz
+8 dBmV
-7 to +23 dBmV
3.2 MHz
+11 dBmV
-4 to +26 dBmV
Содержание BSR 2000
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