Single-port shielded RJ45 with PoE — what the 10/100 Base-T rating means for your build
The TE Connectivity 2337993-2 is a single-port, vertical-mount RJ45 jack built for 10/100 Base-T Ethernet with Power over Ethernet (PoE) support. It carries four cores per jack — the standard pin count for 10/100 wiring — and is explicitly rated for AutoMDIX, so crossover detection is handled at the physical layer.
Why the 10/100 Base-T rating matters — and what it does not support
This jack is rated for 10/100 Base-T and PoE, but not for 1000 Base-T (Gigabit). The four-core-per-jack layout is the standard for 10/100 wiring (two pairs used), whereas Gigabit Ethernet requires all four pairs and typically an eight-core jack. If your BOM calls for Gigabit, the 2337993-2 will not support it — you need a jack rated for 1000 Base-T with eight cores. The PoE rating means it can carry power and data on the same cable, which is the main reason buyers reach for this part over a basic unpowered RJ45. The green-yellow LED indicator is built in for link/activity status, saving a separate panel-mount LED on the board. The shielded construction with a brass shield body helps contain EMI in PoE runs where the shield may carry common-mode return current.