Every camera has its own monitor. One camera, one monitor.

In the late 60s and 70s CCTV systems were introduced in the US and the UK 

Systems from the 60s were basic, consisting of very low resolution black and white cameras connected by coaxial cable. Each camera was connected to a black and white monitor. CCTV systems are over a thousand times more advanced than the basic camera and monitor configurations that first appeared in the 1960s.  So A 16 camera configuration required 16 monitors. New applications of camera security systems include: sports stadiums, retail stores,underground trains and stations,  shopping centers, community parks, garages,public facilities,and parking lots. '1st generation' CCTV technology was created by some pretty major criminal related problems. In the early 80s we learned that VCR recorders had quite a bit of problems. VCR recorders were very complicated and fragile. The quality of the video recordings was not so very clear. as technology was not so advanced by having a low resolution camera and a really low resolution recorder all video recordings count not be used as evidence in the court of law.. the vcr recorder was very un convenient because when you are trying to record a video clip and watch a video clip you can do both at the same time. as the vcr recorder is very time consuming because you would have to rewind and review the cameras. CCTV Technology aroused in the early 60s. the first thing in the begining was that cctv switch boxes were added. A switchbox would allow the operator to switch between cameras. Operators now could see multiple camera views on one monitor. Only one camera could be viewed at a time. The 70's brought Multiplexers, VCRs and solid state cameras. Multiplexers allowed the screen to be broken into multiple frames on the same monitor. VCRs allowed easy recording and video distribution. Solid state cameras helped improve reliability and the integration of VCRs There was no motion detection capability and no way of viewing events from a remote location.. CCTV has come a long way since the early 1960s; it's clear the future of CCTV is going to bomb and that technology will continue to develop to meet the needs of the security surveillance market. DVR eliminated a major problem with earlier generation CCTV systems , Video Tapes! forgot to change the tape, Worn out. The new technology was a computer based Digital Video Recorder (DVR) DVRs allow images to be recorded at much higher resolution than previously. The Next Generation CCTV The next generation of CCTV system arrived in the late 90s. Very Expensive for what you have to pay and what you would get Even though early CCTV systems provided only relatively basic functionality and basic performance, they were quite pricy both in terms of the equipment cost and the installation. Since this is a new growing industry, there are still a lack of professional and skilled installers. Today's generation cameras can pan, tilt and zoom, (PTZ) and have higher resolution options, a many types of lenses and are also capable of operating in night vision. An operator is now able to sync motion based video events with audio analysis. Audio is also a new part of CCTV DVR technology. Next generation DTV DVR systems are compatible with earlier camera technology, and are scaleable, flexible and can be integrated with a broad range of other management systems, such as access control and building management systems. Two way audio transmission allows the operator to question possible intruders, give instructions to staff and to replay/record/search in both audio and visual form.