Restrictions
6
Cisco IOS Release 12.0(5)T
Restrictions
When using the Cisco uBR924 cable access router, keep the following restrictions and limitations in
mind:
• The Cisco uBR924 cable access router 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 classes of service per cable access router.
In addition, the configuration file downloaded to the cable access router must specify the use of
multiple classes of service.
• If the Cisco uBR924 cable access router 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 TheCisco uBR924 cable accessrouter is typically configuredat the headend. Mostsubscriber
sites do not permit local configuration. Remote configuration is either disabled or routinely reset to
settings in the provisioning or billing systems.
Caution Before attempting to reconfigure a Cisco uBR924 cable access router at a subscriber site, contact
your network management, 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 uBR924 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 operator’s headend facility.
Other compatible headend devices may also be used with the Cisco uBR924.
Related Documents
For related information on the Cisco uBR924 cable access router, refer to the following documents:
• Cisco uBR924 Cable Access Router Quick Start Guide
• Cisco uBR924 Cable Access Router Installation and Configuration Guide
• Regulatory Compliance and Safety Info. for the Cisco uBR924 Cable Access Router
• Cisco uBR7246 Installation and Configuration Guide
• Cisco uBR7223 Installation and Configuration Guide
• Cisco uBR7200 Series Configuration Notes
• Cisco Network Registrar for the uBR7200 Series
• Regulatory and Safety Compliance for the Cisco uBR7246
• Regulatory and Safety Compliance for the Cisco uBR7223
• Cisco uBR7200 Series Universal Broadband Router Features
