Home' RTCA Documents for Review : DO-262D Contents 8
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At initial operational capability, it is anticipated that all equipment compliant with this
standard will support Data-2, with Data-3 available when ATN equipment and
procedures are established.
Applications for the NGSS satellite communications include both safety and non-
safety services. Safety services are always given priority, and can, if necessary to
secure system resources, preempt non-safety traffic. A detailed description of safety
and non-safety services falling into the four categories described below can be found
The AES equipment specified here is intended to support the following categories of
aeronautical communications related to the safety and regularity of the flight:
Air Traffic Services (ATS) – Safety communications between the flight crew and air
traffic control as necessary for safe air navigation (e.g., air traffic control, navigation
system operation, weather information collection and dissemination). This includes
tactical control of aircraft to ensure safe separation and sequencing, clearances to
enter controlled airspace, approach clearances, weather information collection and
dissemination, and the coordination of handoffs between adjacent control areas.
Although current procedures provide ats services primarily via voice networks, future
atn applications will primarily use data communications to perform the same functions.
Aeronautical Operational Control (AOC) – Safety communications between the
flight crew and flight operations as necessary for initiation, continuation, diversion, or
termination of a flight in the interest of the safety of the aircraft and the regularity and
efficiency of a flight. Current procedures provide AOC services via both voice and
In addition to safety communications, the equipment specified herein may also support
the following non-safety communications:
Aeronautical Administrative Communications (AAC) – Non-safety communications
between the cabin crew or flight crew and airline business operations as necessary for
passenger services or cabin support services.
Aeronautical Passenger Communication (APC) – Non-safety communications
between an aircraft passenger and party/parties on the ground or in another aircraft
for the passenger’s private or business use. APC services are provided via both voice
and data networks.
Compatibility and Interoperability
NGSS satellite communications must be compatible and interoperable with external
avionics systems and external terrestrial communications networks for users ranging
from private aircraft through widebody commercial jet transports. This requires
implementation of well-defined interfaces and peer-to-peer protocols; therefore, a
NGSS satellite system must provide standard end-user subnetwork interfaces among
satellite systems and associated terrestrial systems on a global basis. One such
standard is the ISO/IEC 8208 mobile sub-network dependent convergence function.
Other standard interfaces are permissible.
For packet data transmissions, NGSS will implement the OSI Reference Model and
will ultimately be integrated in the ATN. When the ATN is operational, NGSS
communications will be interoperable at the subnetwork interface level with High
Frequency (HF), Very High Frequency (VHF) and Mode Select (Mode-S) data links. It
is expected that common operating procedures will be used among all three systems.
For worldwide ATN compatibility among these constituent subnetworks, a common
routing and addressing scheme is required. The twenty-four (24) bit International Civil
Aviation Organization (ICAO) aircraft identification numbers will be recognized by the
NGSS systems. Translation from ICAO standard address to an identity number
consistent with the number used internally by the satellite subnetwork is performed in
a manner transparent to airborne and ground users.
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