Experts! I would appreciate your feedback if any of you have run into this issue or have some clue as to what else I should be troubleshooting.
The scenario is that on Friday, I connected two wall jacks to one of our network switches, and about the same time, a user reported that they lost all connectivity.
After troubleshooting, I found that the line going from our network switch to a small switch at the user's desk had connectivity, but when you plug it into her switch, there's no connectivity. It doesn't assign any IP, and if you set the IP manually, it still has no connectivity. I swapped the smaller switch, but surprisingly, ran into the same issue.
I might understand if there were an issue with the network switch that was somehow caused by connecting the two jacks that I did (although I tried disconnecting them again, which had no affect), but the fact that the line coming into the smaller switch works just fine if you connect it directly to a computer is puzzling me.
To add another level of mystery, if I connect the same smaller switch to a different line coming in from the larger network switch, everything works as expected. So this one has me a bit stumped.
Am I missing something obvious? Any constructive feedback you may have to offer would be appreciated.