Cisco DNCS System Release 2.8.1 3.8.1 4.3.1 User Guide

Your ability to better manage content increases when using parent and child service groups because you can
share the VOD QAM channels of a parent service group with those of its children. Sharing QAM channels gives
you the ability to provide services without consuming a large portion of the available RF spectrum.

For example, because child service groups have access to all of the QAM modulator channels of their parent, a
parent service group typically provides content that is infrequently accessed, such as classic films or
documentaries. Low demand for this type of content means that it can be made available to a larger group of
DHCTs (those fed by a child and its parent) without impacting the ability of subscribers to access the content.
However, content that is in high demand, such as recent movie releases, is typically provided by child service
groups. Child service groups better serve this purpose because they feed a smaller number of DHCTs than
parent service groups.

Note: VOD providers often refer to low-demand content as "library content."

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