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Note 1.- When an ATSC class is specified by an ATN
application, packets will be fonuarded in the ATN inrevnet
communications service on a best effort basis. Best effort basis
means that when a route is available of the requested ATSC
class, the packet is forwarded on that route. When no such
route is available, the packet will be forwarded on the Jirst
known route of the ATSC class higher than that requested, or
if there is no such route, first known route of the ATSC class
lower than that requested.
Note 2.- The ATN communications service will not infonn
application entities if the requested ATSC class was not
achieved. It is the responsibility of the application enti9 to
determine the actual transit delay achieved by local means
such as time stamping.
3.4.8 The ATN shall operate in accordance with the
communication priorities defined in Table 3-2 and Table 3-3.
3.4.9 The ATN shall enable exchange of application
information when one or more authorized paths exist.
3.4.10 The ATN shall notify the appropriate application
processes when no authorized path exists.
3.4.11 The ATN shall provide means to unambiguously
address all ATN end and intermediate systems.
3.4.12 The ATN shall enable the recipient of a message
to identify the originator of that message.
3.4.13 The ATN addressing and naming plans shall
allow States and organizations to assign addresses, and names
within their own administrative domains.
3.4.14 The ATN shall support data communications to
fixed and mobile systems.
3.4.15 The ATN shall accommodate ATN mobile
subnetworks as defined in this Annex.
3.4.16 The ATN shall make provisions for the efficient
use of limited bandwidth subnetworks.
3.4.17 The ATN shall enable an aircraft intermediate
system to be connected to a ground intermediate system via
concurrent mobile subnetworks.
3.4.18 The ATN shall enable an aircraft intermediate
system to be connected to multiple ground intermediate
systems.
3.4.19 The ATN shall enable the exchange of address
information between application entities.
3.4.20 The ATN shall support the context management
(CM) application when any of the other air-ground applications
are supported.
3.4.21 The ATN shall be capable of establishing,
maintaining, releasing and aborting peer-to-peer application
associations for the context management (CM) application.
3.4.22 The ATN shall be capable of establishing,
maintaining, releasing and aborting peer-to-peer application
associations for the automatic dependent surveillance (ADS)
application.
3.4.23 The ATN shall be capable of establishing,
maintaining, releasing and aborting peer-to-peer application
associations for the controller-pilot data link communications
(CPDLC) application.
3.4.24 The ATN shall be capable of establishing,
maintaining, releasing and aborting peer-to-peer application
associations for the automatic teminal information service
(ATIS) application.
* All tables are located at thc cnd of this chapter.
511 1/98
No. 73
Annex 10 - Aeronautical Telecommunications Volume 111
3.4.25 The ATN shall be capable of establishing,
maimdining, releasing and aborting application associations for
the ATS message handling services (ATSMHS) application.
3.4.26 The ATN shall be capable of establishing,
maintaining, releasing and aborting peer-to-peer application
associations for the ATS interfacility data communication
(AIDC) application.
3.4.27 Where the absolute time of day is used within the
ATN, it shall be based on coordinated universal time (UTC).
3.4.28 The end system shall make provisions to ensure
that the probability of not detecting a 255-octet message being
mis-delivered, non-delivered or corrupted by the internet cornmunication
service is less than or equal to 10.' per message.
Note.- It is assumed that ATN subnetworks will ensure
data integriv consistent with this system level requirement.
3.5 ATN APPLICATIONS REQUIREMENTS
3.5.1 System applications
Note.- System applications provide services that are
necessary for operation of the ATN air-ground applications,
ground-ground applications andor ATN communication
services.
3.5.1.1 CONTEXTM ANAGEMEN(CTM )
APPLICATION
Note.- The CM application provides the capabiliry for an
aircraft to log on with an ATS ground system; in some
instances the ground system will request the aircrafr to contact
a specific ground system. Once an appropriate connection is
established, CM pmvides for the exchange of information on
each supported ATN application including the network address
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