Garmin GDL 88 manual Tcas

TCAS	Traffic Collision Avoidance System. An aircraft collision
	avoidance system designed to reduce the incidence of mid-
	air collisions between aircraft. It monitors the airspace around
	an aircraft for other aircraft equipped with a corresponding
	active transponder, independent of air traffic control, and
	warns pilots of the presence of other transponder-equipped
	aircraft which may present a threat of mid-air collision.
TIS-B	Traffic Information Services-Broadcast. TIS-B supplements
	ADS-B’s air-to-air services to provide more situational
	awareness in the cockpit of all traffic known to the ATC
	system. The ground TIS-B station transmits surveillance target
	information on the ADS-B data link for unequipped targets
	or targets transmitting only on another ADS-B link. TIS-B is
	a free service available to aircraft operators equipped with
	ADS-B Out and ADS-B In.
UAT	Universal Access Transceiver. The GDL 88 UAT transmits
	ADS-B Out data on the 978 MHz (UAT) frequency. The GDL
	88 UAT receives ADS-B, ADS-R, TIS-B, and FIS-B on 978 MHz
XPDR	Transponder. The equipment which broadcasts aircraft code,
	altitude and other information to ground facilities and other
	aircraft.

190-01122-03 Rev. A GDL 88 ADS-B Transceiver Pilot’s Guide 7-3