Hi Tom I didn’t do the a or b standard I simply did
 
	w/o,or 
 
	w/Bl,Bl
 
	w/gr, gr
 
	w/br, br 
 
	tested with master tester all cables go from 1-8 fine so no issues with cables or RJ45s when I first connected the nvr to tv I did connect the two cameras that I cannot get working via the patch lead supplied 
 
	I then installed all cables turned nvr on then started connecting the cameras the only two not working like I said are the two I connected pre install would re-format with all cameras unplugged then turn off nvr plug all cameras back in then turn nvr back on solve the issue I have a feeling it’s something IP address related 
 
	Thank you for responding