Verifying Camera Resolution

1. How is it really true the resolution 8Mp or even 4Mp. i mean is there a mean to verify what is claimed in a datasheet of a camera?

2. With an IP cam and Cat cables it is logical to be able to transmit higher resolution as the medium is digital (0s & 1s) so correct me if am wrong how is it possible to do the same over Coax (tvi cvi ..etc) which is Voltage based and bandwidth is limited not to mention interference and disruption chances are high?

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