I'm trying to set up Gigabit Ethernet in a new building that's wired with Cat 5E cabling. There are 6 drops throughout the building but, unfortunately, each room was originally terminated with RJ11 for phone. I switched 4 of the jacks to RJ45. The drops were not terminated so I patched them together into a patch panel in the basement.
Unfortunately it seems like only one of the links reached 1GB. The others cap out at 100MB. I can observe this in a few ways: * the router shows orange link light instead of green * my cable tester only blinks green for pins 1, 2, 3, and 6
I've triple checked the wiring at both ends to make absolutely certain that both sides are using the same standard, 568B. I'm not an expert but the wiring looks fairly clean to me.
Possibly related is that the Gigabit link is to the first floor while the 100MB ones go to floors two and three. I suppose it's possible that there's a bend above floor 1 stressing the cables but it seems unlikely that 3 cables would fail the same way like this. I would expect a wiring issue to prevent the cables from working entirely. This is a new building so I'd be surprised if the cabling was installed incorrectly in the first place.
How can I debug this further?