Cisco Headend System Release 2.5
738185 Rev B
Preface
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Preface
About This Guide
Introduction
Although many cable operators are able to transport data to Broadcast File System
(BFS) Quadrature Amplitude Modulation modulators (QAMs) at different locations,
there is currently no standard method for configuring a System Release (SR) 2.5, 3.5,
or 4.0 system to support distributed BFS. Cisco® developed this guide to provide the
recommended methods for configuring an SR 2.5, 3.5, and 4.0 system to support
distributed BFS.
In addition, this guide provides instructions for enabling the Code Version Table
In addition, this guide provides instructions for enabling the Code Version Table
(CVT) download method for distributed BFS. With the CVT download method, you
must add a data carousel (the Operating System Manager [OSM]) onto the
additional BFS QAM. The normal process for setting up a distributed BFS assumes
that all BFS carousels have a source, a source definition, and a session. The OSM
carousel for a CVT download does not follow this normal process. Therefore, sites
that use a distributed BFS must take additional steps to manage this unique carousel.
Purpose
This guide provides a recommended method for setting up a system that supports
both distributed BFS and the CVT download method. As you configure your system,
you branch into different procedures depending on your network configuration.
Specifically, you must complete additional procedures to enable OSM Automux if
your site uses one or both of the following network configurations:
•
•
The multiplexing device output program numbers do not match the program
numbers going to the primary BFS QAM
•
The distributed BFS QAMs and the primary BFS QAM do not share the same
frequency.
If you decide to change your network configuration later on, you can always disable
OSM Automux using the procedures provided in Chapter 4, Disabling OSM
Automux. Chapter 5, Removing the Distributed BFS Configuration From the
DNCS, details how to remove the entire distributed BFS configuration.
Audience
This guide is written for operators of Cisco’s digital cable television systems. Cisco
field service and on-site engineers who help system operators manage and
troubleshoot their systems may also find the information in this guide useful.
Important: Users of this guide must be proficient with a text editor, such as vi.
Important: Users of this guide must be proficient with a text editor, such as vi.
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