Thursday, January 20, 2011

PoE Sniffer Adapter

Purpose

This project is to create a tap that allows a person to sniff a device attached to Power-over-Ethernet 802.3af Mode B (10/100 DC on Spares) cable. While I've seen many PoE implementations simply inject power onto the cable and later split it off, I've seen devices such as Avaya's VoIP phones have native PoE support built-in. Taping these lines have two concerns, the potential to damage equipment not designed for PoE, as well as making sure that the Device dependent on PoE is able to power up. Building a basic device isn't as complex as it sounds, all that is required is a basic four port wall jack and some crafty wiring.