The CNS/ATM Transponder

The XS-950 Air Transport Data Link (ATDL) Mode S transponder is a full-feature system combining flawless implementation of all currently defined Mode S functions with unparalleled capability for future growth.

Over 4,000 XS-950 Mode S transponders have been delivered to more than 100 operators worldwide since the product debuted in 1996. Most Air Transport OEMs offer the XS-950, including Airbus, Boeing, Antonov, Ilyushin, and Tupolev. Airline industry leaders such as British Airways, Crossair, Federal Express, Iberia, KLM, Northwest Airlines, Qantas, Saudia, SWISS Airlines, and UPS have selected XS-950 as their transponder system of choice.

Our Mode S transponder is the industry's only ICAO Level IV transponder, capable of both uplink and downlink extended length messaging (COMM-C/D). The XS-950 meets or exceeds the latest requirements of ICAO Standards and Recommended Practices (SARPs) Annex 10 and RTCA DO-181C Minimum Operational Performance Standards (MOPS) for Mode S equipment and ARINC 718A Mode S characteristics.

The XS-950 has all of the required functionality for ICAO ACAS II mandate compliance, European Elementary and Enhanced Mode S Surveillance Downlink of Aircraft Parameters (DAPs), and ADS-B 1090ES extended squitter, as currently defined in the Aeronautical Information Circulars (AICs) and ICAO SARPS.

The XS-950 Mode S transponder has been designed for reliable performance and ease of maintenance. Highly Accelerated Life Testing (HALT) was performed on all engineering models of the XS-950. Each production XS-950 unit is subjected to Highly Accelerated Stress Screening (HASS) before being shipped to customers to ensure the highest product quality and to prevent failures from ever reaching the end user.

High reliability of our Mode S transponder greatly enhances the overall TCAS system reliability by reducing Mode S transponder-induced TCAS no-fault-found failures. Upgrades to the XS-950 are performed through on-board software loads, providing operators with significant cost savings and scheduling flexibility.

The XS-950 Mode S Transponder is easily upgradeable for tomorrow's technology requirements. The rigorous design of our system allows major functionality upgrades, such as ICAO Level V datalink or pending U.S. transponder security modifications (also known as the Hijack Mode), with software-only changes.

Technical Specifications
Part Number	7517800-xxxxx

Physical Size
Dimensions	4 MCU
Weight	11.5 lbs
Mounting	ARINC 600 4 MCU Mount
Cooling	ARINC 600DO-160C

Certification
Environmental Specifications	DO-160C
TSO/JTSO	C112/2C112
Software	DO-178B Level B
Transponder Data Link Capability	ICAO Level 4 (COMM-A/B/C/D)
ADS-B Capability (part no. X003/4/5)	1090ES Extended
	Squitter per RTCA DO-260 MOPS for 1090 ADS-B Equipment
Operating Altitude	Sea level to 70,000 feet
Operating Temperature	-55 to 70 degrees C
Storage Temperature	-55 to 85 degrees C
Power	115VAC, 400Hz or 28 VDC
Power Consumption	40 Watts (standby), 85 Watts (maximum)
Number of Antenna Ports	2 (diversity)

Interfaces
Controller	Low speed ARINC 429
TCAS II	High speed ARINC 429
Airborne Data Link Processor (ADLP)	High speed ARINC 429
Altimeter	ARINC 429/575 (digital air data),
	ARINC 407 (synchro), Gilham 11-wire discrete
Flight Identifier	Low speed ARINC 429
Maintenance Computer (Airbus & Boeing)	Low speed ARINC 429
Portable Data Loader	ARINC 615