Motorola BSR 64000, Reference Manual

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BSR 64000 Command Reference Guide
13-72
cable upstream power-level default
The BSR CMTS interface controls CM output power levels to meet the desired
CMTS upstream input power level. Input power level adjustments to an upstream port
compensate for CMTS signal degradation between the optical receiver and the
upstream RF port.
The cable upstream power-level default command is used to set the upstream input
power level in relative mode, which means that 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
Table 13-3 describes how the upstream channel bandwidth corresponds to the input
power-level range and default power-level range for a specific upstream channel.
Group Access
MSO
Command Mode
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 13-3 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