Video can be transmitted or transported in a variety of ways. Wireless broadcast as an analog or digital signal. Coaxial cable in a closed circuit technique can be sent as analog interlaced one volt peak to peak with a maximum horizontal line resolution up to 480. Broadcast or studio cameras use a single or dual coaxial cable technique using a progressive scan format known as SDI serial digital interface & HD-SDI for High Definition video. The distances of transmission are limited depending on the manufacturer the format may be proprietary. SDI has a negligible lag & is uncompressed. There's initiatives to make use of the SDI standards in closed circuit surveillance systems, for Higher Definition images, over longer distances on coax or twisted pair cable. Due to the nature of the higher bandwidth needed, the distance the signal can be effectively sent is a half to a third of what the older interlaced analog systems supported
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