System Description

System Description and Installation Manual for MXS ICD10004-01
© Sagetech Corporation 2018 Confidential Proprietary Export-Controlled Page 159 of 160
Appendix A: Glossary
ACK: Each time the MXS receives a message, it responds with an acknowledgement message indicating that
the information was received and set correctly. The acknowledgement message also contains MXS status
information. This message is called the Acknowledge Message or ACK for short.
ADS-B: Automatic Dependent Surveillance-Broadcast (ADS-B) is an emerging system for cooperative air
traffic control. The MXS broadcast GPS and other aircraft-related data to the ATC system and nearby aircraft.
ADS-B MOPS: Automatic Dependent Surveillance-Broadcast (see ADS-B) minimum operational
performance standards (MOPS). The MXS is compliant with RTCA/DO-260B.
ADS-R: ADS-B Rebroadcast. The Messages of the ADS-B Rebroadcast Service are not transmitted by aircraft,
but by ADS-B ground stations.
ATC: The Air Traffic Control (ATC) system uses ground-based hardware and air traffic controllers to direct
aircraft traffic.
ATCRBS: Air Traffic Control Radar Beacon System.
GPRMC: Recommended minimum data. NMEA 0183 sentence that contains all basic GPS requirements for
an MXS. See NMEA 0183 below.
GPS: A space-based global positioning system that provides reliable location and time information. Note that
other systems that provide equivalent data may be used (GLONASS, Galileo, etc.). It is not the intent of this
document to limit the user to only the GPS.
Heading: The direction an aircraft is pointing.
ICAO address: A 24-bit address used to identify aircraft. ICAO stands for International Civil Aviation
Organization.
IDENT: IDENT is short for identify. When air traffic control requests that the aircraft “identify,” the pilot uses
the IDENT function to send a message to ATC that enhances or exaggerates the blip on the air traffic
controller’s radar screen. The IDENT function should only be activated at the request of ATC.
IIC: Interrogator Identifier Subfield. The 4-bit IIS within the SD field, contains the self-identification code of
the interrogator.
IP Address: Internet Protocol address. A numerical label assigned to a device participating in a computer
network that uses the Internet Protocol for communication.
LSB: Least significant bit.
LSN: Least significant nibble (4 bits).
MOPS: Minimum Operational Performance Specification.
MSB: Most significant bit.
MSN: Most significant nibble (4 bits).