Switched video
（重定向自Switched Digital Video）
Switched video or switched digital video (SDV), sometimes referred to as switched broadcast (SWB), is a telecommunications industry term for a network scheme for distributing digital video via a cable. Switched video sends the digital video in a more efficient manner so that additional uses may be made of the freed up bandwidth. The scheme applies to digital video distribution both on typical cable TV systems using QAM channels, or on IPTV systems. Users of analog video transmitted on the cable are unaffected. See diagram to the right for an illustration of how switched video saves bandwidth on a cable company's cables in the last mile where channels are transmitted via coaxial cable.