It sits in the 5555153 series of standard Ethernet jacks, carrying the board lock and panel stop features that anchor it to the PCB and align it with the panel cutout.
The Shielding and Mechanical Anchors Matter Here
The shielded shell bleeds EMI from the cable shield to the board ground before it couples into the signal pairs — critical if this jack sits near a switching supply or a radio board. The panel stops set the depth so the jack face sits flush with the enclosure bezel; without them the connector can push through or sit recessed, which fouls the latch on a standard RJ45 plug.
The Cat3 rating tells you this jack is specified for Category 3 cabling — 16 MHz signal bandwidth, which covers basic 10BASE-T Ethernet and voice. For Gigabit or PoE applications you would step to a Cat5e or Cat6 jack; the 8p8c footprint is the same, but the internal crosstalk compensation differs.