Megapixel Resolution vs. Analog's Highest Resolution
Don't be fooled by what many competitors claim is high resolution or even high definition CCTV. Based on NTSC/PAL standards the maximum resolution for an analog camera is 0.4 megapixels. Analog high resolution is not very high at all and there is no such thing as a high definition analog camera, no matter what the salesman says.
The following 2 pictures help illustrate this point by comparing a Megapixel IP Camera to a supposed "high resolution" analog camera running at 4CIF.