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Aircraft address. A unique combination of twenty-four bits
available for assignment to an aircraft for the purpose of
air-ground communications, navigation and surveillance.
Doppler shij-t. The frequency shift observed at a receiver due
to any relative motion between transmitter and r~ceiver.
End-to-end. Pertaining or relating to an entire communication
path, typically from (1) the interface between the information
source and the communication system at the transmitting
end to (2) the interface between the communication
system and the information user or processor or application
at the receiving end.
End-user. An ultimate source and/or consumer of information.
ANNEX 10 - VOLUME III
Anriex 10 - Aeronautical Telecommunications Volume 111
Energyper symbol to noise derzsity ratio (EJNo). The ratio of
ihe average energy transmitted per channel symbol to the
average noise power in a I Hz bandwidth, usually
expressed in dB. For A-BPSK and A-QPSK, one channel
symbol refers to one channel bit.
Equivalent isotropiculZ~ radiated power (e.i.r.p}. The product
of the power supplied to the antenna and the antenna gain
in a given direction relative to an isotropic antenna
(absolute or isotropic gain).
Forward error correction (FEC}. The process of adding
redundant information to thc transmitted signaI in a manner
which allows correction, at the receiver, of errors incurred
in the transmission.
Guilt-to-noise temperature ratio. The ratio, usually expressed
in dB/K, of the (antenna gain to the noise at the receiver
output of the antenna subsystem. The noise is expressed as
the temperature that a I ohm resistor must be raised to
produce lhe same noise power density.
Ground earth station (GES}. An earth station in the fixed
satellite service, or, in some cases, in the aeronautical
mobile-satellile service, located at a specified fixed point on
land to provide a feeder link for the aeronautical mobilesateIlite
service.
Note.- This definition is used in tlze ITU's Radro
Regularions rlnder the term "aeronautical earth station." The
definition herein as "GES" for ~isein the SARPs is ro clear-ly
disrrngilrsh it from un uircraft earth station (AES), which is a
mobile station otr an aircraft.
Mode $subnetwork. A means of performing an interchange of
digital data through the use of secondary surveillance radar
(SSR) Mode S interrogators and transponders in accordance
with defined protocols.
Packet. The basic unit of data transfer among communications
devices within the n~tworkla yer.
Packet layer protocol (PLP). -4 protocol to establish and
maintain a connection between peer level entities at the
network layer, and to transfer data packets between them. In
the context of this standard, the term refers to the protocol
defined by the IS0 8208 sttmdard used in this document.
Point-to-point. Pertaining or relating to the interconnection of
two devices. particularly end-user instruments. A
communication path of service intended to connect two
discrete end-users: as distinguished from broadcast or
multipoint senrice.
Slotted aloha. A random access strategy whereby multiple
users access the same communications channel
independently, but each communication must be confined to
a fixed time slot. The same timing slot structure 1s known
to all users, but there is no other co-ordination between the
users.
Switched virtual circuit (SVC). The primary circuit
management technique provided within the IS0 8208
protocol. The network resources are dynamically allocated
when needed and released when no longer required.
Time division rnuIsiplex (TDM). A channel.sharing strategy in
which packets of information from the same source but
with different destinations are sequenced in time on the
same channel.
Time division multiple access (TDMA). A multiple access
scheme based on time-shared use of an RE: channel
employing: (1) discrete contiguous time slots as the
fundamental shared resource; and (2) a set of operating
protocols that allows users lo intcract wilh a master control
station to mediate access to thc channel.
Transit delay. In packet data systems, the elapsed time
between a request to transmit an assembled data packet and
an indication at the receiving end that the corresponding
packet has been received and is ready to be used or
forwarded.
VHF digital link (VDL). A constituent mobile subnetwork of
the aeronautical telecommunication network (ATN),
operating in the aeronautical mobile VHF frequency band
In addition, the VDL may provide non-Am iunctions such
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