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Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-08
Chapter1 Overview of CiscouBR10012 Universal Broadband Router Software
Supported Software Features for the CiscouBR10012 Router
A-DSG 1.1 introduces powerful support for DOCSIS 1.1 and DOCSIS 2.0, and the latest DOCSIS DSG
specifications. The benefits provided by A-DSG include the following:
•Retains the essential nature of out of band (OOB) messaging, but moves it to a modern technology base.
•Replaces single-vendor, low-density, special-purpose equipment on the network, with significantly
increased subscriber bandwidth and traffic.
•Consolidates cable modem and STB data traffic on a shared DOCSIS channel.
•Increases high-speed data (HSD) services to cable TV subscribers over the DOCSIS 1.1
infrastructure,
•Extends support for DOCSIS 1.1 digital video broadcast traffic.
•Enables shared or dedicated support for either HSD or video traffic.
•Supports one- or two-way operations, and advanced, two-way interactive applications such as
streaming video, Web browsing, e-mail, real-time chat applications, and targeted advertising services.
These powerful advantages maximize the performance and return of hybrid fiber-coaxial (HFC) plant
investments.
Changes from Cisco DSG 1.0
DSG Issue 1.0 is oriented to the DOCSIS DSG-I01 specifications, while DSG Issue 1.1 is oriented
towards DOCSIS DSG-I02 specifications, to include the new Advanced Mode DSG (A-DSG).
The following DSG 1.1 features are supported in 12.3(13a)BC while continuing support for Basic Mode
DSG:
•DSG 1.1 enables the learning of dynamic tunnel definitions. DSG 1.0 only had static tunnel
definitions (programmed into the set-top box).
•DSG 1.1 features new Cisco IOS command-line interface (CLI) configuration and show commands
for A-DSG configuration and network information.
Unlike earlier issues of DSG, Advanced-mode DSG (A-DSG) uses a DOCSIS MAC Management Message
called the Downstream Channel Descriptor (DCD) message, and this DCD message manages the DSG
Tunnel traffic. The DCD message is sent once per second on each downstream and is used by the DSG
Client to determine which tunnel and classifier to use.
The DCD has a DSG address table located in the DOCSIS MAC management message. The primary
difference between DSG 1.0 (and earlier issues) and A-DSG 1.1 is that advanced mode uses DCD
messages to manage the DSG tunnels.
The DCD message contains a group of DSG Rules and DSG Classifiers, including the following:
•DSG rules and rule priority
•DSG classifiers
•DSG channel list type/length value (TLV)
•DSG client identifier (whether broadcast, CA System, application, or MAC-level)
•DSG timer list
•DSG upstream channel ID (UCID) list
•Vendor-specific information field