It carries a Cat5 rating, so it handles 100 MHz baseband signals typical of Fast Ethernet and 100BASE-TX networks — fine for most office and light-industrial data links.
This jack mounts at the board edge with a cutout — the through-hole solder tails and the board guide take the alignment load during assembly. The tab faces down, so the locking latch on a standard RJ45 plug clicks in from the top side of the board.
For a panel-mounted jack that gets cycled during field service or test, this plating grade buys you years of reliable contact resistance before fretting becomes a concern.