Installation guide

4-2
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 4 Configuring Basic Broadband Internet Access
Typical Routing Configuration For High Speed Internet Access
Figure 4-1 Two-Way Internet Access Network Example
Note The external upconverter shown in Figure 4-1 is needed only if you are not using the router’s integrated
upconverter.
Typical Routing Configuration For High Speed Internet Access
When running in routing mode, the Cisco uBR7100 series router is fully capable of self provisioning all
cable modems and hosts to which it is attached. The router supports multiple IP subnets, including
different subnets for hosts and cable modems. Configuration options are only limited by available
configuration file length.
The Cisco uBR7100 series CMTS automatically connects DOCSIS-compliant cable modems and hosts
right out of the box. Therefore, the factory-supplied configuration activates the downstream RF to
851 MHz center frequency, and the upstream to 37 MHz.
Step 1 Connect one upstream and the downstream port to a duplex filter.
Note Do not combine multiple ports as they are all set on the same frequency.
Step 2 Use at least 40 dB attenuation before the first modem, and modems will connect in under 5 minutes.
The following sample configuration file configures the Cisco uBR7111 router for typical routing
operation with the following features:
• Basic DOCSIS Internet Access
Off-air
channels
Satellite
channels
Internet
Headend / Hub
Receivers
Descramblers
Scramblers
RF combiner
Subscriber
cable modem
Optical node
Optical node
Optical node
AM & digital
modulators
Optical transmitter
Optical transmitter
Optical transmitter
Optical receiver
RF amplifiers
37393
Cisco uBR7100
series
RF
RF RF
RF
RF
RF
Ta p
Upstream
Upconverter
IF
Downstream
RF
10BaseT