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Cisco Broadband Cable Command Reference Guide
OL-1581-08
Chapter 2 Cisco CMTS Configuration Commands
cable downstream rf-power
cable downstream rf-power
To set the RF power output level on an integrated upconverter on the Cisco uBR7100 series router,
Cisco uBR-MC16U, Cisco uBR-MC28U or Cisco uBR10-MC5X20S/U cable interface line card, use the
cable downstream rf-power
command in cable interface configuration mode. To reset the RF output
power level to its default value, use the
no
form of this command.
cable downstream rf-power
{
power-level
|
hccp-delta
diff-pwr
|
hccp-override
override-pwr
}
no cable downstream rf-power
{
power-level
|
hccp-delta
diff-pwr
|
hccp-override
override-pwr
}
Syntax Description
Defaults
50 dBmV for the Cisco uBR7100 series router
55 dBmV for the Cisco uBR-MC5X20S cable interface line card on the Cisco uBR10012 router
55 dBmV for the Cisco uBR-MC16U and Cisco uBR-MC28U cable interface line cards
58 dBmV for the Cisco uBR10-MC5X20U-D cable interface line card on the Cisco uBR10012 router
Command Modes
Interface configuration (cable interface only)
power-level
Desired RF output power level in dBmV. The valid range is 45 to
63 dBmV.
Note
The official range for acceptable power levels in the DOCSIS
specification is 50 to 61 dBmV. Cisco cable interfaces exceed
the DOCSIS specification, but power levels outside the
DOCSIS specifications should be used only in lab and test
environments.
hccp-delta
diff-pwr
(Protect interfaces only) When using N+1 Hotstandby Connection-
to-Connection Protocol (HCCP) redundancy, the Protect interface
adds the
diff-pwr
value to the current Working interface’s power
value when a switchover occurs. This allows the router to
accommodate relative differences between the RF power levels in
Working and Protect interfaces. The valid range for
diff-pwr
is –12 to
+12 dBmV.
hccp-override
override-pwr
(Protect interfaces only) When using N+1 HCCP redundancy, the
Protect interface uses the override power value instead of the
Working interface’s current power value when a switchover occurs.
This allows the router to accommodate absolute differences between
the RF power levels in Working and Protect interfaces. The valid
range for
override-pwr
is 45 to 63 dBmV.
Note
The official range for acceptable power levels in the DOCSIS
specification is 50 to 61 dBmV. Cisco cable interfaces exceed
the DOCSIS specification, but power levels outside the
DOCSIS specifications should be used only in lab and test
environments.
