Cisco Headend Digital Broadband Delivery System 技术参考
4038990 Rev A
3
Overview
SDV
Switched Digital Video. SDV is a technology that allows cable operators to
recover bandwidth from infrequently-viewed channels, by making these
channels "on-demand." Instead of sending all channels to the set-tops,
lightly viewed channels are put into a switching pool and are only sent to
the set-tops when viewers tune to them.
recover bandwidth from infrequently-viewed channels, by making these
channels "on-demand." Instead of sending all channels to the set-tops,
lightly viewed channels are put into a switching pool and are only sent to
the set-tops when viewers tune to them.
VOD
Video-on-Demand. The ability of a subscriber to select a program event
and watch it within moments of selection. VOD allows pausing and
rewinding of the event.
and watch it within moments of selection. VOD allows pausing and
rewinding of the event.
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Document Version
This is the first formal release of this document.