The TE 1955491-1 is an A-RJ45 series modular jack, wired 8p8c — the standard pinout for 10/100/1000BASE-T Ethernet. It is a right-angle, surface-mount jack with a shielded body and integral EMI fingers, designed to land on the board edge of a switch, router, gateway, or industrial Ethernet node where the cable enters parallel to the PCB. The housing is a thermoplastic body with a board guide feature to locate the jack during pick-and-place, and the tab direction is up, which matches the majority of standard RJ45 plugs.
Shielding and EMI Strategy
For an Ethernet port on a metal enclosure, this finger is what keeps the radiated emissions within Class B limits; without it the unshielded gap radiates at the clock harmonic.