Restrictions
Configuring the Cisco uBR900 Series Cable Access Routers 31
Restrictions
When using the Cisco uBR900 series cable access router, keep the following restrictions and
limitations in mind:
•The Cisco uBR900 series is able to implement multiples classes of service (CoS) on the cable
interface; however, separate CoS streams are only available when the cable access router is
connected to a headend that supports multiple CoS per cable access router. In addition, the
configuration file downloaded to the cable access router must specify the use of multiple CoS.
•If the Cisco uBR900 series is connected to a DOCSIS 1.0 headend that does not support multiple
CoS per cable access router, voice and data will be mixed, and voice traffic will be transmitted
on a best effort basis. This may cause poorer voice quality and lower data throughput when calls
are being made from the cable access router’s telephone ports. Voice quality is also affected when
transmitting or downloading large files, as well as by other significant network traffic.
Note The Cisco uBR900 series cable access router is typically configured by the headend CMTS.
Most cable service providers do not permit local configuration by individual subscribers.
Caution Before attempting to reconfigure a Cisco uBR900 series cable access router at a subscriber site,
contact your network administrator, provisioning manager, or billing system administrator to ensure remote
configuration is allowed. If remote configuration is disabled, settings you make and save at the local site will
not remain in effect after the cable access router is powered off and back on. Instead, settings will return to
the previous configuration.
Related Features and Technologies
The Cisco uBR900 series cable access router is intended to be used in conjunction with a
Cisco uBR7246 or a Cisco uBR7223 universal broadband router located at the cable service
provider’s headend facility. Other compatible headend devices may also be used with the
Cisco uBR900 series.
Related Documents
For related information on the Cisco uBR900 series cable access router, refer to the following
documents:
•Quick Start Guide - Cisco uBR924 Cable Access Router Subscriber Setup
•Quick Start Guide - Cisco uBR924 Cable Access Router Installation and Startup
•Cisco uBR924 Installation and Configuration Guide
•Regulatory Compliance and Safety Information for the Cisco uBR924 Cable Access Router
•Cisco uBR7200 Series Installation and Configuration Guide
•Cisco uBR7200 Series Configuration Notes
•Cisco Network Registrar for the uBR7200 Series
•Regulatory Compliance and Safety Information for the Cisco uBR7200 Series Universal
Broadband Router
•Cisco uBR7246 Universal Broadband Router Features
•Cisco uBR7246 Universal Broadband Router Feature Enhancements