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Technology is forever evolving, and that applies to the world of CCTV too.
When choosing a security solution, you have many choices to consider. The main one being Analogue or Digital cameras. If there is already an analog system, do you simply upgrade or replace everything? If it is a new security system, should they choose analog (AHD/TVI/CVI/CVBS) or a digital IP CCTV security system?
Either way you want to be making an informed decision based on your needs and budget.