Cisco Headend System Release 2.5 User Guide
4004831 Rev B
Managing VOD Sessions In an Overlay Environment
3-1
Chapter 3
Managing VOD Sessions In an Overlay Environment
Overview
Introduction
If you are using QAM modulators from a vendor other than Cisco in your Overlay
environment, add them to the DNCS. The non-Cisco QAMs (also referred to as third-
party QAMs)
are typically used to provide VOD service. For this reason they are part
of a service group.
If your system uses third-party QAMs and they have not been
added to the DNCS, Cisco set-tops may be unable to tune to the correct channel to
receive a VOD event.
Before You Begin
Before you begin, you must have your network map available. If you cannot locate
your network map, contact Cisco Services. You must also have the following
information:
•
•
Number identifying the service group to which each third-party QAM belongs
•
Number identifying the transport stream going from each third-party QAM out to
the hubs on your system
•
Frequency of the channel being used to send data from each third-party QAM to
the hubs on your system
•
Type of modulation each third-party QAM uses
In this chapter
This chapter contains the following topics.
Topic
See Page