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subnetwork of thc aeronautical telecommunication network
(ATN), operaling in the aeronautical mobile VHF frequency
band. In addition, the VDL may provide non-ATN functions,
such as, for instance, digitized voice. The very high frequency
(VHF) digital link ( D L ) Standards and Recommended
Practices (SARPs) defined and referenced below apply to
aeronautical VHF digital communications systems operating
within the aeronautical telecommunication network (ATN).
6.1.1 Definitions
Broadcast link handoff The process by which a ground LME
commands certain aircraft to execute a link handoff to a
specific ground station without the need to explicitly
confirm the ].ink handoff.
Broadcast subnetwork connection handoff. The process by
which a ground LME commands certain aircraft to execute
a link handoff to a specific ground station and maintain its
current subnetwork connections without the need to
explicitly confirm the link handoff or the subnetwork
connection maintenance.
Current link (or current ground station). Either the groundto-
aircraft link or the active link when in the process of a
handoff.
Aeronautical telecommunications network. An internetwork ~~t~ circuit-teminating equipment. A DCE is a network
architecture that allows ground, air-ground, and aircraft provider equipment used to facilitate communications
data subnetworks to interoperate by adopting common between DTEs.
interface services and protocols based on the International
Organization for Standardization USO) Open Systems Data link en@. A protocol state machine capable of setting
Interconnection (OSI) Reference Model. up and managing a single data link connection.
AircrafC d r e s s . A unique combination of 24 bits available
for assignment to an aircraft for the purpose of air-ground Data link service sub-layer. The sub-layer that resides above
communications, navigalion and surveillance. the MAC sub-layer. The DLS manages the transmit queue,
creates and destroys DLEs for connection-oriented commu-
Asynchronous balanced mode. A balanced operational mode nications, Provides facilities for the LME to manage the
in which a data link connection has been established DLS, and provides facilities for connectionless
between two service access points. Either data link entity communications.
can send commands at any time and initiate responses
without receiving permission from the peer data link entity Data terminal equipment- A DTE is an endpoint of a subon
the connection. network connection.
Asynchronous disconnected mode. A balanced non- Effective data rate. The actual instantaneous data throughput
operational mode in which no logical data link connection realized after overheads imposed by bit stuffing and by
exists between two link laycr entities. A connection must any forward error correction encoding, but not
be established beforc data can be sent. retransmissions.
ATN router. An intermediate system used to interconnect
subnetworks conforming to the lower three layers of the
OSI reference model.
Autotune function. The function, performed by the link
management entity, allows a ground station to comtnand
an aircraft to change frequencies.
Broadcast. A transmission intended to be received by all
stations.
Broadcast hand08 The process by which a ground LME
commands certain aircraft to execute a link handoff and
optionally maintain its current subnetwork connections,
without the need to explicitly confirm thc link handoff or
optionally the subnetwork connection maintenance.
Expedited subnetwork connection establishment. The process
by which an aircraft DTE establishes a subnetwork
connection with a ground DTE with which it does not
have a subnetwork connection during link establishment
(or aircraft-initiated handoff) by inserting the CALL
REQUEST packet and its response in the link
establishment (or aircraft-initiated handoff) frame and its
response.
Expedited subnetwork connection maintenance. The process
by which an aircraft or ground DTE maintains a
subnetwork connection with a DTE with which it has a
subnetwork connection during link handoff by inserting the
CALL REQUEST packet and its response in the link
handoff frame and its response.
ANNEX 10 - VOLUME III -6/11/97 No. 72
Annex 10 - Aeronautical Telecommunications Volume III
Explicit subnetwork connection establishment. The process An aircraft VME instantiates an LME for each ground
by which an aircraft DTE establishes a subnetwork station that it monitors. Similarly, the ground VME
connection with a ground DTE with which it does not instantiates an LME for each aircraft that it monitors. An
have a subnetwork connection only after completing the LME is deleted when communication with the peer system
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