Originally Posted by
Squawk7777
Any ideas? I am confused why the LAN tester checks OK, but no data transfer occurs. Should I re-crimp?
What sort of LAN tester is it? A simple continuity tester? That will tell you if you've got any opens/shorts and if pin 1 --> pin 1.
But the cheaper ones cannot detect getting the conductors between different twisted pairs mixed up. If continuity is OK, the power over Ethernet will work. But crosstalk between mixed up wire pairs will mess up the data.
I've got a cheap, no name continuity tester. But I keep a little chart of which pin pairs belong in each color coded twisted pair. And inspect the finished product by eye.