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Chapter 2
Cisco CMTS Configuration Commands
cable upstream docsis-mode
To configure an upstream to use either DOCSIS 1.x or DOCSIS 2.0 modulation profiles, use the cable
upstream docsis-mode command in cable interface configuration mode. To reset the upstream to its
default configuration, use the no form of this command.
Syntax Description
n
atdma
tdma
tdma-atdma
Defaults
All upstreams are configured TDMA-only mode (DOCSIS 1.0/DOCSIS 1.1).
Command Modes
Interface configuration (cable interface only)
Command History
Release
12.2(15)CX
12.2(15)BC2
Usage Guidelines
The DOCSIS 2.0 specification provides support for advanced modulation profiles that increase potential
upstream bandwidth by building on the existing TDMA support. The Advanced TDMA profiles support
higher QAM rates up to 64-QAM and wider channel widths up to 6.4 MHz (5.12 Msymbols).
Note
The advanced hardware-based spectrum management features for the Cisco uBR-MC16S/U/X,
Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U cards are supported only in the DOCSIS 1.0/1.1
TDMA-only mode. They cannot be used in the mixed or A-TDMA-only modes.
OL-1581-08
cable upstream n docsis-mode {atdma | tdma | tdma-atdma}
no cable upstream n docsis-mode {atdma | tdma | tdma-atdma}
Modification
This command was introduced to support DOCSIS 2.0 A-TDMA and mixed
modulation profiles on the Cisco uBR-MC16U/X and
Cisco uBR-MC28U/X cable interface line card on the Cisco uBR7246VXR
router.
Support was added for the Cisco uBR-MC5X20S/U cable interface line
cards on the Cisco uBR10012 router.
Specifies the upstream port. Valid values start with 0 for the first
upstream port on the cable interface line card.
Configures the upstream for DOCSIS 2.0 Advanced Time Division
Multiple Access (A-TDMA) modulation profiles only.
Configures the upstream for DOCSIS 1.0/DOCSIS 1.1 Time Division
Multiple Access (TDMA) modulation profiles only (default).
Configures the upstream for both A-TDMA and TDMA operation
(mixed mode).
If using abbreviations at the command line, you must specify
Note
at least "tdma-" to select mixed mode. If you choose a shorter
abbreviation, you select TDMA-only mode.
Cisco Broadband Cable Command Reference Guide
cable upstream docsis-mode
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