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affect the air traffic services being provided to the aircraft,
coordination shall be effected prior to such testing.
8.2.14 Downstream clearance delivery service
8.2.14.1 The appropriate ATS authority shall determine
whether an ATC unit supports downstream clearance delivery
service.
8.2.14.2 Establishment of downstream
clearance delivey service
8.2.14.2.1 Downstream clearance delivery service shall
only be initiated by the airborne system. The initiation shall
indicate that this communication is only to receive a
downstream clearance.
8.2.14.2.2 When an ATC unit rejects a request for
downstream clearance delivery service, it shall provide the
pilot with the reason for the rejection using the CPDLC
message SERVICE UNAVAILABLE.
8.2.14.3 Operation of downstream
clearance delivey service
8.2.14.3.1 The controller and pilot shall be informed
when downstream clearance delivery service is available for
operational communication.
8.2.14.3.2 The controller and pilot shall be informed of
the failure of downstream clearance delivery service.
8.2.14.3.3 The CPDLC message elements that are
permitted for downstream clearance delivery service shall be
established by regional air navigation agreement.
8.2.14.3.4 A clearance request issued as a downstream
clearance request shall be clearly identifiable as such to the
controller.
8.2.14.3.5 A clearance issued as a downstream clearance
shall be clearly identifiable as such to the pilot.
8.2.14.4 Termination of downstream
clearance delivev service
8.2.14.4.1 Termination of downstream clearance delivery
service shall only be initiated by the airborne system.
8.2.14.4.2 Downstream clearance delivery service with an
ATC unit shall be terminated whenever the downstream data
authority becomes the current data authority.
ATTACHMENTS TO ANNEX 10 - VOLUME I1
Attachment A to Volume I1 -
LIST OF SPECIALIZED COM TERMS AND THEIR DEFINITIONS
RELATED TO AERONAUTICAL TELECOMMUNICATIONS PLANNING
On 25 March 1964 the Council at the 1 lth Meeting of its
Fifty-first Session approved the following list of specialized
communication terms and their definitions for general use
within ICAO. The Council further requested States to use the
terms in the approved manner in particular in correspondence
with ICAO, in working papers presented by them to ICAO
meetings and in any other appropriate texts.
Those terms which are marked with an asterisk are already
used and defined in the main body of Annex 10 while the
remaining terms were selected as terms in general use by
aeronautical telecommunications people but having caused
difficulty at some ICAO meetings or having resulted in the
development of conflicting definitions by different meetings.
1. For general use
*Aeronautical telecommunication agency. An agency
responsible for operating a station or stations in the
aeronautical telecommunication service.
*Aeronautical telecommunication service. A telecommunication
service provided for any aeronautical purpose.
*Aeronautical telecommunication station. A station in the
aeronautical telecommunication service.
*Aircraft operating agency. The person, organization or
enterprise engaged in, or offering to engage in, an aircraft
operation.
*Double channel simplex. Simplex using two frequency
channels one in each direction.
N o t e . This method was sometimes referred to as cross
hand.
*Duplex. A method in which telecommunication between two
stations can take place in both directions simultaneously.
*Frequency channel. A continuous portion of the frequency
spectrum appropriate for a transmission utilizing a specified
class of emission.
N o t e . The classification of emissions and information
relevant to the portion of the frequency spectvum
appropriate ,for a given type of transmission (bandwidths)
are specified in the ITU Radio Regulations, Article S2 and
Appendix SI.
*International telecommunication service. A telecommunication
service between offices or stations of different States,
or between mobile stations which are not in the same State,
or are subject to different States.
*Ofjet jkequency simplex. A variation of single channel
simplex wherein telecommunication between two stations
is effected by using in each direction frequencies that are
intentionally slightly different but contained within a
portion of the spectrum allotted for the operation.
'Simplex. A method in which telecommunication between two
stations tales place in one direction at a time.
Note.- In application to the aeronautical mobile service
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