CCTV is going DIGITAL with increasing speed to understand and implement these solutions different skill sets are required.
Modern Digital systems leverage existing IT type server and cabling systems (Cat5 Cat 6 Fibre) this can at times make substantial savings on the overall cost of a project.
Utilising technologies such as PoE (Power over Ethernet) is again a way of getting everything down the same wire and No power needed at the camera. When you utilise a UPS (uninterruptable Power Supply) this give added security as when your power is cut off your security is not.
If over the years you have made substantial investment is high powered expensive analogue cameras do you know their current condition? Have they plenty of service left in them? Are they compatible with today's modern systems? All these and more questions can be answered with demonstrations of what is possible with your existing site.