The same pattern occurs on all devices. Example, my IRIS Security system only works when plugged into the back of the Airport Extreme, not from any other switch.

So, I thought I'd be smart - plug the Airport Extreme directly into the Surfboard Modem and then to the switch. Sometimes it worked, sometimes it didn't! So I purchased a VTLAN4 Tester. Followed its directions - checked an Ethernet cable from the switch to a computer desk I have. It says it should light up 1-2-3-4-5-6-7-8-G. Guess what? It lights up in that order, EXCEPT for the "G". What does that mean? It doesn't say!

Very frustrated rookie here. I thought this would be easy...

Please help.


I didn't find the right solution from the Internet.


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