The Westin St. Francis http://www.westinstfrancis.com/ is using the Versa Technologies Pi-100SP http://www.versatek.com/products/poe-splitter.htm to operate their room card verification in their elevators. 

The PoE Splitter allows them to use existing wiring in the elevators to power the card verification systems for restricted floors. The PoE Splitter allows attendees to the World Famous Ballroom private access to the function with the swipe of a room key.