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this method may he subdivided as,follows:
a) single channel simplex,
b) double channel simplex;
c) ofl~et,frequencsyi mplex.
*Single channel simplex. Simplex using the same frequency
channel in each direction.
2. For use in aeronautical
fixed service planning
*Aeronautical jixed service (AFS). A telecommunication
service between specified fixed points provided primarily
for the safety of air navigation and for the regular, efficient
and economical operation of air services.
*Aeronautical jixed telecommunication network (AFTN). A
worldwide system of aeronautical fixed circuits provided,
ANNEX 10 - VOLUME I1 ATT A-1 1/11/01
Annex 10 - Aeronautical Telecommunications Volume 11
as part of the aeronautical fixed service, for the exchange of
messages andlor digital data between aeronautical fixed
stations having the same or compatible communications
characteristics.
*AFTN communication centre. An AFTN station whose
primary function is the relay or retransmission of AFTN
traffic from (or to) a number of other AFTN stations
connected to it.
*AFTN destination station. An AFTN station to which
messages are addressed for local delivery to the addressee.
AFTN entry-exit points. Centres through which AFTN traffic
entering and leaving an ICAO Air Navigation Region
should flow.
*AFTN group. Three or more radio stations in the
aeronautical fixed telecommunications network exchanging
communications on the same radio frequency.
*AFTN origin station. An AFTN station where messages are
handed in for transmission over the AFTN.
*AFTN station. A station forming part of the aeronautical
fixed telecommunication network (AFTN) and operating as
such under the authority or control of a State.
*Automatic relay installation. A teletypewriter installation
where automatic equipment is used to transfer messages
from incoming to outgoing circuits.
N o t e . This term covers bothfully automatic and semiautomatic
installations.
Channel. A single means of direct fixed service
communication between two points.
Circuit. A communication system which includes all the direct
AFTN channels between two points.
*Communication centre. An aeronautical fixed station which
relays or retransmits telecommunication traffic from (or to)
a number of other aeronautical fixed stations directly
connected to it.
*Fully automatic relay installation. A teletypewriter installation
where interpretation of the relaying responsibility in
respect of an incoming message and the resultant setting-up
of the connections required to effect the appropriate
retransmissions is carried out automatically, as well as all
other normal operations of relay, thus obviating the need for
operator intervention, except for supervisory purposes.
*Incoming circuit responsibility list. A list, for each incoming
circuit of a communication centre, of the location indicators
for which relay responsibilities are to he accepted in respect
of messages arriving on that circuit.
*Location indicator. A four-letter code group formulated in
accordance with rules prescribed by ICAO and assigned to
the location of an aeronautical fixed station.
Reluy time. The relay time of a COM centre is the elapsed
time between the instant that a message has been
completely received at that centre and the instant that it has
been completely retransmitted on an outgoing circuit.
Route (AFTN). The path followed by a particular channel of
a circuit.
Routing (AFTN). The chosen itinerary to be followed by
messages on the AFTN between acceptance and delivery.
*Routing Directory. A list in a communication centre indicating
for each addressee the outgoing circuit to be used.
"Routing Livt. A list in a communication centre indicating for
each addressee the outgoing circuit to be used.
*Semi-automatic relay installation. A teletypewriter
installation where interpretation of the relaying
responsibility in respect of an incoming message and the
resultant setting-up of the connections required to effect the
appropriate retransmissions require the intervention of an
operator but where all other normal operations of relay are
carried out automatically.
*"Torn-tape" relay installation. A teletypewriter installation
where messages are received and relayed in teletypewriter
tape form and where all operations of relay are performed
as the result of operator intervention.
Transit time. The elapsed time between the instant of filing a
message with an AFTN station for transmission on the
network, and the instant that it is made available to the
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