What does the etched (vs non-etched) RJ45 jack indicate?
I have 3 of the 2GB versions; only one works in the remote location powered by PoE. The two that do NOT work - the newest and oldest of the 3 - have an etched RJ45 jack.
The one that does work has no etching.
What do I ask for, when ordering, to receive the non-etched version?
Image shows Pis and the POE hat. Labeled with purchase dates.
I move the SD Card and the POE HAT to each Pi in-turn for testing (eg all is identical except the Raspberry Pi itself).
Note: for the good Pi, once the ethernet cable is plugged in, within 2 seconds I see proper activity lights on the RJ45 jack. for the 2 'bad' Pis, I plug in the ethernet cable, and approx. 15 sec later both lights on the RJ45 jack flash on/off approx once per second. and the PI is not pingable (and doesn't grab an address from DHCP)
Note2: all 3 Pis work fine when powered by the USBC port (with and without the POE hat installed)
so, what does the etching mean?
or, any suggestions how to get the 2 non-working Pis to function.
cat /proc/cpuinfo
do all 3 pis have the same Revision and Model? (I'm sure there's been at least two releases of the pi 4)2020.04.06 (working)
Revision : b03111 Serial : 100000003c0b9da7 Model : Raspberry Pi 4 Model B Rev 1.12020.05.18 (non-functional)
Revision : b03111 Serial : 10000000505670db Model : Raspberry Pi 4 Model B Rev 1.1