Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
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Chapter 2 Configuring the Cisco CMTS for the First Time
Configuring Using the setup Facility
Step 10 When asked if you want to use this configuration, enter yes or press Return.
Use this configuration? [yes/no]: yes
Step 11 Save your settings to NVRAM. (Refer to the “Using the Setup Facility for Cable Interfaces” section on
page 2-17.)
Note You must always manually save the configuration settings to NVRAM whenever they are
modified.
Configuring Upstream Frequencies
Upstream parameters must be configured manually. After the setup facility is run, upstream ports have
a default state of “shutdown.” You have two methods to configure upstream channel frequencies:
• Configure a fixed frequency between 5 to 42 MHz for North American channel plans or
between 5 to 65 MHz for PAL and SECAM channel plans (requires MC16E), and enable the
upstream port.
• Create a global spectrum group, assign the interface to it, and enable the upstream port.
The cable interface card receiver accepts time-division multiplexed burst transmissions from
cable interfaces (or cable modems in set top boxes) which are DOCSIS- or EuroDOCSIS-based. The
upstream port becomes “up” when it is assigned an upstream frequency and is configured to be
administratively up.
The upstream port is frequency-agile. The frequency can change while the interface is up and carrying
traffic, if you define spectrum groups per the example provided.
You can define individual modulation profiles. A modulation profile consists of a table of physical layer
characteristics for the different types of upstream bursts, for example, initial maintenance, long grant,
request/data, request, short grant, and station maintenance.
Note Only qualified personnel should define upstream modulation profiles.
Complete these steps to activate upstream interfaces:
Step 1 After the setup facility has initially configured noncable interfaces on the Cisco uBR7100 series router,
enter the enable command and your password (privileged EXEC).
Step 2 Enter the configure terminal command to get into global configuration mode.
Step 3 In global configuration mode, configure modulation profiles and spectrum groups for your Cisco uBR7100
series router using the cable modulation-profile and cable spectrum-group commands.
Step 4 In cable interface configuration mode, configure various characteristics for the interface in question
using the cable upstream commands.
Note Refer to Chapter 3, “Configuring the Cisco Cable Interface” for further information.