I have two RJ45 sockets connected by an inaccessible unknown-category twisted pair cable. I plug two unmanaged gigabit switches into the sockets using Cat6 cables, and they negotiate a 100Mbps link. I suppose there's nothing I can do to try and get them to connect at 1Gbps?
edit Connected back-to-back, the switches negotiate 1Gbps.
edit The sockets are labelled Cat5e, which gives some indication of the age of installation. The cable has four pairs and all appear to be wired at both ends. Is there any way to test the wiring on the cheap? This thing looks like it might do the trick -- any opinions?
edit The cheap continuity tester helped diagnose and fix the problem in no time.