Philadelphia Ranked 7th Among Most Cursed Sports Cities In America. PHILADELPHIA - JUNE 09: The Chicago Blackhawks celebrate after defeating the Philadelphia Flyers 4-3 in overtime and win the Stanley Cup in Game Six of the 2010 NHL Stanley Cup Final at the Wachovia Center on June 9, 2010 in Philadelphia, Pennsylvania.
Duplex (telecommunications) - Half duplex. 1  A half-duplex (HDX) system provides communication in both directions, but only one direction at a time (not simultaneously).
As a result the duplex scheme to be used forms a very basic part of the overall specification for the cellular (or any radio communications system) that is to be used. The different schemes for controlling the transmission range from simplex through half duplex to full duplex.