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Configuration Options
Bridging and Routing Features for the Cisco uBR924 Cable Access Router 3
After the Cisco uBR924 is installed and the connected PCs are configured for IP, and after DHCP
services are enabled and communication to the headend is established, the Cisco universal
broadband router downloads configuration information to the cable access router. The initial
configuration connection to the headend can take several minutes.
Figure 3 illustrates a broadband data cable system. Data transmitted to a Cisco uBR924 cable access
router from the CMTS shares a 27 Mbps or 26 Mbps, 6 MHz data channel in the 88 to 860 MHz
range. The Cisco uBR924 cable access router shares an upstream data rate of up to 10 Mbps on a
200 kHz-wide to 3.2 MHz-wide channel in the 5 to 42 MHz range.
Note End-to-end throughput varies based on the design and loading of network components, the
mix of traffic, the processing speed and interface of the host server(s), the processing speed and local
Ethernet performance of the subscriber’s computer, as well as other parameters.
Figure 3 Typical Cisco Broadband Data Cable System
Configuration Options
The Cisco uBR924 cable access router is usually configured automatically at startup via a
configuration file generated by the cable service provider and downloaded to the cable access router;
however, you can also manually configure the cable access router to function either as a bridge or
as a router. The following sections give brief descriptions of both applications.
Note When the Cisco uBR924 cable access router is shipped from the factory, it is configured by
default for DOCSIS-compliant bridging.
Cisco uBR900 series
cable access router
18197
HFC
cable
plant
Internal backbone
and
worldwide internet
Cable System Headend
Upstream and downstream data interfaces
Operation support system interface
Downstream RF interface
Upstream RF interface
Residence or SOHO
subscriber site:
subscriber RF interface
Ethernet interface
Fiber
WAN
Switch/router
Servers
CMTS
rack equipment
Combiner
Tx
Rx