Rockwell Collins has planned updates for its Automatic Dependent Surveillance-Broadcast (ADS-B) transponder offerings for business aircraft. An update to the Rockwell Collins’s TDR-94/94 D transponders -the TDR-94D-409 - offered primarily as a retrofit solution, is now available to comply with the new ADS-B mandate in Australia, and the pending 2009 restrictions in the Hudson Bay. The updates are available through a recently issued sales bulletin titled, “Mode S Elementary/Enhanced Surveillance and ADS-B.” Today more than 15,000 aircraft are already equipped with the TDR-94/94 D transponders. The TDR-94/94D, Mode-S transponders, which originally received FAA and European Aviation Safety Agency approval for “ADS-B out” functionality in 2005, serve as a modem for data link, performance, navigation and Air Traffic Control information between the aircraft and a Mode S secondary surveillance radar. In addition, the TDR-94D may be used in conjunction with any compatible TCAS II system.
 In the forward-fit segment, Rockwell Collins offers the TSS-4100 Traffic Surveillance System. The TSS-4100 combines the TCAS, transponder, and ADS-B functions of a TDR-94D and a TCAS-4000 into a single unit, saving weight, space, and capital. A software update to the TSS-4100 will add "ADS-B In" functionality in the near future. 
 “ADS-B out” allows properly equipped aircraft to broadcast an aircraft's position, speed, altitude, heading in the air as well as on the ground which enables ATC stations to have a better radar picture. The future application of “ADS-B in” will allow aircraft to receive the ADS-B out signal as well and provide the individual pilot's better situational awareness.