I live in a dorm and there's a RJ45 connector on the wall, which is connected to a router somewhere in the building (which I do not have access to). Supposing I do not know the exact hardware equipment connected to the other side, but knowing the following facts:
- when connecting a RJ45 connector to the plug, I can often see sparks, which is odd to me;
- the equipment has a bad reputation (frequent hardware issues).
Can I infer the equipment might have some electrical issues, or is it very unlikely/impossible? Is there a way to test such issues on the RJ45 plug?