Lantronix WP500100S-01 Networking Module, 10 Base-T, 100 Base-TX

Serial-to-Ethernet Connectivity Module
Pin Compatible with the Lantronix WiPort Serial-to-802.11 Wireless Module
Build Ethernet or IP networking into your products quickly and easily
Provide a smooth transition to 802.11b/g wireless networking without any board redesign (using WiPort)
Proven operating system, embedded web server complete network protocol stack
256-bit AES encryption for secure communications
EMC/EMI-compliant; RoHS-compliant