Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 1 Overview
Operating Standards for Cisco IOS Software
Upgrading to a New Software Release
An upgrade is an order placed for a Cisco IOS® feature set that contains more functionality than the one
that you are replacing. And upgrade is not an update. An update consists of installing a more recent
version of the SAME feature set. Exception— If a feature set has been made obsolete, the next, closest
feature set, on a more recent release, will be considered an update.
For general information about upgrading to a new software release, refer to the Cisco IOS Upgrade Ordering
Instructions on Cisco.com.
Operating Standards for Cisco IOS Software
The Cisco uBR7100 series routers support both the DOCSIS and EuroDOCSIS specifications,
depending on the model. The Cisco uBR7111 and Cisco uBR7114 routers support DOCSIS operations,
and the Cisco uBR7111E and Cisco uBR7114E routers support EuroDOCSIS operations. The following
sections describe each standard in more detail.
DOCSIS Cable Plants
When using the DOCSIS specification, a cable plant modulates and demodulates data using 6-MHz
downstream channels in the 54 to 860-MHz range and upstream channels in the 5 to 42 MHz range. The
cable interface supports NTSC channel operation, using standard (STD), Harmonic Related Carrier
(HRC), or Incremental Related Carrier (IRC) frequency plans conforming to EIA-S542.
NTSC uses a 6 MHz-wide modulated signal with an interlaced format of 25 frames per second and 525
lines per frame. NTSC is compatible with CCIR Standard M. PAL, used in West Germany, England,
Holland, Australia, and several other countries.
Note Cisco 6-MHz products can be used in Cisco 8-MHz cable plants. The products, however, operate at a
maximum downstream bandwidth of 27 Mbps, ignoring 2 MHz of available channel width, and limiting
upstream channel choices to the range below 42 MHz.