What it is and where it fits
Siemens 6GK7443-1RX00-0XE0 communication processor fits an S7-400 single-width 25 mm slot, with three RJ45 ports (one 10/100, two 100 Mbit/s) and DCP/NTP/secure NTP support; no ring redundancy.
Panel integration notes
Single-width S7-400 module, 25 × 290 × 210 mm (W×H×D). IP20 protection. Power drawn from the backplane: 5 V DC, 1.8 A typical, 9 W dissipation. Three RJ45 ports on the front — two with fixed 100 Mbit/s, one auto-negotiating 10/100. No physical port blocking is included (that feature is available via software lock, but the hardware lacks a switch-off). Mount in the rack and connect via standard patch cords. The module supports up to 14 active connections per CPU and up to 128 connections in multi-CPU systems; per PG access limited to 2.