To produce a good quality picture on a monitor, the video signal must be applied to the monitor with little or no distortion of any of its elements, i.e. the time relationship of the various signals and amplitude of these signals. However in CCTV systems the camera has to be connected to a monitor by a cable or another means, such as Fibre Optic or Micro Wave link. This interconnection requires special equipment to interface the video signal to the transmission medium. In cable transmission, special amplifiers may be required to compensate for the cable losses that are frequency dependant.

Northwood Technology distributes a wide range of CCTV transmission products.