Arduino Ethernet Shield R3 with PoE allows an Arduino board to connect to the internet. It is based on the Wiznet W5100 ethernet chip. The Wiznet W5100 provides a network stack capable of both TCP and UDP. It supports up to four simultaneous socket connections. Use the ethernet library to write sketches which connect to the internet using the shield.
Arduino Ethernet Shield R3 with PoE now includes a micro SD card connector, it is Arduino Mega compatible and has an on-board reset controller. Arduino Ethernet Shield R3 with PoE connects to an Arduino board using long wire-wrap headers which extend through the shield. This keeps the pin layout intact and allows another shield to be stacked on top.
Arduino uses digital pins 10, 11, 12, and 13 (SPI) to communicate with the W5100 on the ethernet shield. These pins cannot be used for general I/O. Arduino Ethernet Shield R3 with PoE has a Power over Ethernet (PoE) module designed to extract power from a conventional twisted pair category 5 ethernet cable:
Board Specifications:
PoE Module Specifications:
Arduino Ethernet Shield with PoE Module R3 Schematic
Arduino Ethernet Shield with PoE Module R3 Quaick Start Guide
Arduino Web Site
http://arduino.cc/en/Main/ArduinoEthernetShield