Cable Downstream Frequency - Cisco SR2016T-NA Reference Manual

Chapter 2 Cisco CMTS Configuration Commands

cable downstream frequency

To note the downstream center frequency for the cable interface line card to reflect the digital carrier
frequency of the downstream radio frequency carrier (the channel) for that downstream port, use the
cable downstream frequency command in cable interface configuration mode. On cable interfaces with
an integrated upconverter, to unset the downstream frequency and to disable the RF output from the
integrated upconverter, use the no form of this command.
The no form of this command is supported only on the Cisco uBR-MC16U/X, Cisco uBR-MC28U/X,
Note
and Cisco uBR-MC5X20S/U cable interface line cards, and on the Cisco uBR7100 series universal
broadband router.
Syntax Description
down-freq-hz
Defaults
Disabled. On the Cisco uBR7100 series routers, the default downstream center frequency for the
integrated upconverter is 500 MHz.
Command Modes Interface configuration (cable interface only)
Command History Release
11.3 XA
12.0(7)XR2, 12.0(8)SC Modified to support PAL/SECAM EuroDOCSIS RF operation.
12.1(2)EC1
12.1(5)EC1
12.2(11)CY,
12.2(11)BC3
OL-1581-08
cable downstream frequency down-freq-hz
no cable downstream frequency
The known center frequency of the downstream carrier in Hz (the valid
range is 55,000,000 to 858,000,000). The usable range depends on whether
the downstream is configured for DOCSIS or EuroDOCSIS operations:
•
•
•
The Cisco IOS supports a superset of these standards, and setting a center
frequency to a value outside these limits violates the DOCSIS or EuroDOCSIS
standards. Cisco does not guarantee the conformance of the downstream and
upconverter outputs when using frequencies outside the DOCSIS or
EuroDOCSIS standards.
Modification
This command was introduced to support NTSC/DOCSIS Annex B RF
operation.
Supports both Annex A and Annex B.
Modified to support the integrated upconverter on the Cisco uBR7100 series
universal broadband router.
Support was added for the Cisco uBR-MC5X20S cable interface line card.
DOCSIS = 88,000,000 to 855,000,000 MHz
Extended frequency range = 70,000,000 to 855,000,000 MHz
EuroDOCIS = 112,000,000 to 858,000,000 MHz
Cisco Broadband Cable Command Reference Guide
cable downstream frequency
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