The Switching Off Of The Missing Plane's Automated Communication Systems Has Triggered Calls By Aviation Analysts For Airlines To Consider Upgrading Or Resdesigning Devices Such As Transponders And Beacons. Daybreak Asia's Michael Lipin Has Been Examining That Issue As Part Of A Series Of Reports On What Can Be Done Ip Prevent Similar Disappearances Of Passenger Planes In The Future. On Wednesday, He Spoke With Mark Roberti, Founder Of RFID Journal. A US Media Company Focused On Radio Frequency Identification Devices Used In Aviation And Other Industries. Lipin Started By Asking Roberti To Explain What A Beacon Is, And How It Works.