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Cisco Broadband Cable Command Reference Guide
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Chapter 2 Cisco CMTS Configuration Commands
cable freq-range
cable freq-range
To configure the Cisco CMTS router for the range of frequencies that are acceptable on upstreams, use
the
cable freq-range
command in global configuration
mode. To restore the default value (which is
based on the cable interface and on the Annex A/B configuration), use the
no
form of this command.
cable freq-range
[
european
|
japanese
|
north-american
]
no cable freq-range
Syntax Description
Defaults
no cable freq-range
, which defaults to a frequency range based on the Annex configuration:
•
Annex A =
european
(EuroDOCSIS, 5 MHz to 65 MHz)—Supported only on cable interfaces that
support EuroDOCSIS
•
Annex B =
north-american
(DOCSIS, 5 MHz to 55 MHz)—All cable interfaces support the 5 MHz
to 42 MHz range. The 42 MHz to 55 MHz range is supported only on certain cable interfaces.
Command Modes
Global configuration
Command History
Usage Guidelines
In Cisco IOS Release 12.2(15)BC2 and later, the Cisco CMTS router supports three different modes of
operation, depending on the cable interface line cards being used. The range of frequencies that are
allowed in each mode are as follows:
•
North American DOCSIS (Annex B)—Upstreams use frequencies between 5 MHz and 42 MHz.
This range is supported by all cable interface line cards.
•
European EuroDOCSIS (Annex A)—Upstreams use frequencies between 5 MHz and 65 MHz.
•
Japanese Extended Range (Annex B)—Upstreams use frequencies between 5 MHz and 55 MHz.
To configure the router so that it supports the proper range of upstream frequencies, use the
upstream
freq-range
command. After you have configured the router with the
cable freq-range
command, the
cable upstream frequency
and
cable spectrum-group (interface configuration)
commands then
accept only frequencies that are in the configured range.
european
Configures the Cisco CMTS router to accept upstream frequency ranges
that conform with the EuroDOCSIS specifications (5 MHz to 65 MHz).
japanese
Configures the Cisco CMTS router to accept upstream frequency ranges
that conform to the extended range used in Japan (5 MHz to 55 MHz).
north-american
Configures the Cisco CMTS router to accept upstream frequency ranges
that conform to the DOCSIS specifications (5 MHz to 42 MHz).
Release
Modification
12.2(15)BC2
This command was introduced for the Cisco uBR7246VXR and
Cisco uBR10012 universal broadband routers.
