Cisco Broadband Cable Command Reference Guide

Chapter 2 Cisco Cable Modem Termination System Commands
cable downstream annex
Syntax Description
OL-1581-05
cable downstream annex
To set the Motion Picture Experts Group (MPEG) framing format for a downstream port on a cable
interface line card to either Annex A (Europe) or Annex B (North America), use the cable downstream
annex command in cable interface configuration mode.
cable downstream annex {A | B}
Defaults Annex B for all Cisco cable interface cards other than the Cisco uBR-MC16E. Annex A, if using the
Cisco uBR-MC16E cable interface line card and the Cisco uBR7111E and Cisco uBR7114E universal
broadband routers.
Command Modes Interface configuration (cable interface only)
Command History
A Annex A. The downstream uses the EuroDOCSIS J.112 standard.
B Annex B. The DOCSIS-compliant cable plants that support North American channel plans
use ITU J.83 Annex B downstream radio frequency.
Release Modification
12.1(1a)T1 This command was introduced.
12.0(7)T, 12.1(1a)T1, Support for Annex A was introduced for the Cisco uBR-MC16E cable
12.1 mainline,
12.0(8)SC, 12.1(2)EC1
interface line card.
12.1(7)EC Support for Annex A was added for the Cisco uBR7111E and
Cisco uBR7114E universal broadband routers.
Usage Guidelines The MPEG framing format must be compatible with the downstream symbol rate you set. Annex B is
the North America (DOCSIS) standard and Annex A is the European (EuroDOCSIS) standard. You
should review your local standards and specifications for downstream MPEG framing to determine
which format you should use.
Note This command can be used to change the symbol rate, alpha, and other parameters for compliance with
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.
Cisco Broadband Cable Command Reference Guide
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