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Chapter 2
Cisco CMTS Configuration Commands
This command can be used to change the symbol rate, alpha, and other parameters for compliance with
Note
EuroDOCSIS (annex A), or DOCSIS (annex B). Annex A is not supported on the Cisco uBR-MC1xC,
Cisco uBR-MC16B, Cisco uBR-MC16S, and Cisco uBR-MC28C cable interface line cards. Annex B is
not supported on the Cisco uBR-MC16E card and on the Cisco uBR7111E and Cisco uBR7114E
universal broadband routers.
Note
The cable interface line card downstream ports and the CMs on the HFC network connected through
these ports must be set to the same MPEG framing format.
In Cisco IOS Release 12.1, only Annex B MPEG framing format is supported.
Caution
Changing the MPEG framing format affects the PHY layer on the downstream and disconnects all online
Tip
CMs. For this reason, if you are using N+1 HCCP redundancy, you should configure this command on
both the Protect and Working interfaces, so that the PHY layer is properly configured before a
switchover occurs. Otherwise, online CMs could be disconnected when a switchover occurs. (This also
applies to the
Examples
The following example shows how to set the MPEG framing format to Annex A:
Router# configure terminal
Router(config)# interface cable 1/0
Router(config-if)# cable downstream annex A
Router(config-if)#
The following example shows how to set the MPEG framing format to Annex B:
Router# configure terminal
Router(config)# interface cable 4/0
Router(config-if)# cable downstream annex B
Router(config-if)#
Related Commands
Command
show controllers cable
OL-1581-08
cable downstream modulation
Description
Displays the downstream MPEG framing format (Annex A or
Annex B) setting.
and
cable downstream interleave-depth
Cisco Broadband Cable Command Reference Guide
cable downstream annex
commands.)
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