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Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-05
Chapter 1 Overview of Cisco uBR10012 Universal Broadband Router Software
Supported Software Features for the Cisco uBR10012 Router
http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_docs.html
DOCSIS 1.0+ Feature Support
In response to the limitations of DOCSIS 1.0 in handling real-time traffic, such as voice calls, Cisco
created the DOCSIS 1.0+ extensions to provide the more important QoS enhancements that were
expected in DOCSIS 1.1. In particular, the DOCSIS 1.0+ enhancements provide basic Voice-over IP
(VoIP) service over the DOCSIS link.
Cisco DOCSIS 1.0+ extensions include the following DOCSIS 1.1 features:
•
Multiple SIDs per CM, creating separate service flows for voice and data traffic. This allows the
CMTS and CM to give higher priority for voice traffic, preventing the data traffic from affecting the
quality of the voice calls.
•
CM-initiated dynamic MAC messages—Dynamic Service Addition (DSA) and Dynamic Service
Deletion (DSD). These messages allow dynamic SIDs to be created and deleted on demand so that
the bandwidth required for a voice call can be allocated at the time a call is placed and then freed
up for other uses when the call is over.
•
Unsolicited grant service (CBR-scheduling) on the upstream—This helps provide a higher-quality
channel for upstream VoIP packets from an Integrated Telephony CM (ITCM) such as the
Cisco uBR924 cable access router.
•
Ability to provide separate downstream rates for any given CM, based on the IP-precedence value
in the packet—This helps separate voice signaling and data traffic that goes to the same ITCM to
address rate shaping purposes.
•
Concatenation allows a CM to send several packets in one large burst, instead of having to make a
separate grant request for each.
Caution
All DOCSIS 1.0 extensions are available only when using a CM (such as the Cisco uBR924 cable
access router) and CMTS (such as the Cisco uBR10012 router) that support these extensions. The
CM activates the use of the extensions by sending a dynamic MAC message. DOCSIS 1.0 CMs
continue to receive DOCSIS 1.0 treatment from the CMTS.
DOCSIS 1.1 Feature Support
DOCSIS 1.1 is the first major revision of the initial DOCSIS 1.0 standard for cable networks. Although
the initial standard provided quality data traffic over the coaxial cable network, the demands of real-time
traffic such as voice and video required many changes to the DOCSIS specification.
Note
At the time of publication, the DOCSIS 1.1 specification is still being finalized. This document
describes the DOCSIS 1.1 specification SP-RFIv1.1-IO3-991105. See the CableLabs Web site
(
http://www.cablelabs.com
) for the current status on DOCSIS 1.1.
This section describes the major enhancements supported on the Cisco uBR10012 router:
•
DOCSIS 1.1 Baseline Privacy Interface Plus Features
•
DOCSIS BPI+ Multiple Root Certificate Support
•
DOCSIS 1.1 CM Compatibility
•
DOCSIS 1.1 CM Database Manager
•
DOCSIS 1.1 Concatenation Support
–
See also
DOCSIS 1.0 Concatenation Override
•
DOCSIS 1.1 Customer Premises Equipment Configurator
•
DOCSIS 1.1 Downstream Packet Classifier
