Transport video interface (TVI) is a way of transmitting analog video over a coaxial cable.
What is TVI?
TVI is a type of cabling for the transmission of video over coaxial cables. These are the black cables used to watch analog cable TV. TVI has largely replaced CVBS as the cabling of choice for analog security camera systems for two reasons.
First, depending on the TVI cable, their maximum transmission range can be as high as 600 m/2000 ft, which is approximately six times larger than CVBS cables. This also makes it useful for large spaces where Power over Ethernet (PoE) limitations (100 m/325 ft) would make cabling impossible without expensive repeaters.
Second, TVI is compatible with HD analog security cameras, unlike CVBS which is limited to SD cameras.
Why is TVI important?
TVI is a key enabling technology for analog security camera systems. While IP cameras have largely made analog cameras obsolete, replacing working cameras can be an expensive undertaking. As such, many businesses are looking to maintain their analog cameras until they stop working.
For analog security camera cabling, the main options are CVBS and TVI. In this comparison, TVI has two main advantages over CVBS. First, the transmission range is extended. Second, TVI is one of several technologies that can allow analog security cameras to operate at high definition (HD).