Types of Twisted Pair Tranmission

There are two devices used in a basic twisted pair transmission system, a transmitter and a receiver. The transmitter takes the CCTV signal (usually from a coaxial cable) as its input and transmits it over a UTP cable. The receiver then takes this as its input and relays it through a BNC connector where it can again be transmitted over coaxial cable (usually going to a digital video recorder).

The transmitter and receiver can either be passive or active. Passive transmitters and receivers do not need power to work but their range is shorter than active ones. Active transmitters need power to work but can work for longer distances. The following table provides an estimate of the range or distance of transmission that can be reached by combining active and passive types.

References

"CCTV Smart Cabling Twisted Pair Transmission System." SC & T, Print.