Cisco Headend System Release 2.7 디자인 가이드
4024319 Rev B
1
Introduction
The growth in service bandwidth available to the cable service
provider has far outpaced the increases in available access network
bandwidth. This growth is due, in part, to upgrades and rebuilds. This
same expansion of available services has also created a situation in
which, at any given time and in any given service group, most services
are not being viewed. Thus, bandwidth for an edge device (for
example, a QAM modulator) and access network bandwidth is wasted
because many of the services that are continuously broadcast to
subscribers are not being watched. SDV is a technique that recaptures
such potentially wasted access network bandwidth by delivering
selected services only where and when users are actively requesting
service. This technique is performed through program switching.
provider has far outpaced the increases in available access network
bandwidth. This growth is due, in part, to upgrades and rebuilds. This
same expansion of available services has also created a situation in
which, at any given time and in any given service group, most services
are not being viewed. Thus, bandwidth for an edge device (for
example, a QAM modulator) and access network bandwidth is wasted
because many of the services that are continuously broadcast to
subscribers are not being watched. SDV is a technique that recaptures
such potentially wasted access network bandwidth by delivering
selected services only where and when users are actively requesting
service. This technique is performed through program switching.
This chapter provides a brief review of traditional linear broadcasting
over a Hybrid Fiber-Coax (HFC) network and contrasts this with how
SDV operates. In addition, this chapter describes the benefits of SDV
to the cable service provider.
over a Hybrid Fiber-Coax (HFC) network and contrasts this with how
SDV operates. In addition, this chapter describes the benefits of SDV
to the cable service provider.
1
Chapter 1
Introducing Switched Digital
Video
In This Chapter
The Switched Digital Solution .............................................................. 3