Re: Monitor
"My personal bugbear is the "cable tester says it's OK" when the port(s) are clearly not fine for the intended purpose."
Mine too. Most cheap cable testers run at DC.
Ethernet runs at a few hundred MHz. You have to have the mindset that these are fancy (and sensitive) antenna cables, with an RF approach required for best results.
You can do a _basic_ test with a cheap tester but it's not the be-all and end-all. On top of that badly wired connections will frequently pass on the expensive testers if they're less than 100metres. (The most common failing is tails which are _way_ too long, or rotten IDC punchdowns.)
It's cheaper to toss a dodgy connector than to rewire it.
Biting the hand that feeds IT
