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provide point-to-point speech circuits to interconnect area
control centres not interconnected by dedicated circuits shall
be by agreement between the Administrations concerned.
4.1.2 The application of aeronautical speech circuit
switching and signalling shall be made on the basis of regional
air navigation agreements.
4.1.3 Recommendation.- Where implemented, aeronautical
speech circuit switching and signalling should
provide:
a) priority access;
b) automatic call-back;
c) conference calling;
d) through switching facilities;
e) the capability of alternate routing, when necessary and
feasible;
fl identification of originator for incoming calls, when
necessaly and feasible; and
g) call forwurding, when necessary and feasible.
Note I.- Identification of originator is done by analysis
of the originator's code which is transmitted on both
signalling systems R2 and No. 5.
Note 2.- Call forwarding ensures that calls to operating
positions which are temporarily not manned will be rerouted
automatically to an appropriate operating position.
4.1.4 Recommendation.- The churacteristics of signalling
tones used in aeronautical speech circuit switching and
signalling should conform to ZTU CCLT Signalling System
No. 5 or to ITU CCIlT Signalling System R2 as appropriate.
Signalling tones on interregional trunks should conform to one
of these ITU CCITTspecifcations as determined by agreement
between the Administrations concerned.
Note.- Details of ITU CCITTSignalling System No. 5 are
contained in CCITT Yellow Book, Volume VI - Fascicle VI-2;
details of ITU CCITT Signalling System R2 are contained in
CCIn Yellow Book. Volume VI - hscicle VI-4.
4.1.5 Recommendation.- The characteristics of the
ringing tone, the busy tone and the congestion tone used in
aeronautical speech circuit switching and signalling should
conform to ITU CCIiT Recommendation E. 180.
Note.- Details of ITU CCITT Recommendation E. 180 are
contained in CCZiT Yellow Book, Volwne II - Fascicle 11-2.
4.1.6 Recommendation.- The numbering plan used in
aeronautical speech circuit switching and signalling should
consist of six digits whereby the first two digits identih the
area, the third and fourth digits the control centre and thefifrh
and sixth digits the working position or correspondent within
the control centre. Up to two additional digits m y be added
following the sixth digit to allow a larger number of positions
within a control centre to be ~roiquely ~ddressed.
Note.- The area identijier may be used to idenhfi either
a country or a group of countries.
4.1.7 Recommendation.- lt should not be necessary
to dial the area identifier code on calls between stations
sharing a common area identifier.
ANNEX 10 - VOLUME 111
7/11/96
No. 71
CHAPTER 5. EMERGENCY LOCATOR TRANSMITTER (ELT)
FOR SEARCH AND RESCUE
5.1 GENERAL 5.2.1.3 Over a period of 48 hours of continuous operation,
at an operating temperature of minus 20°C the peak
5.1.1 Emergency locator transmitters shall operate either effective radiated power (PEW) shall at no time be less than
on both 406 MHz and 121.5 MHz or on 121.5 MHz. 50 mW.
Note.-- ELTs operating on 121.5 MHz will be required to
meet the improved technical characteristics contained in
5.2.1.8, not later than 1 January 2000.
5.1.2 All, installations of emergency locator transmitters
operating on 406 MHz shall meet the provisions of 5.3.
5.1.3 All installations of emergency locator transmitters
operating on 121.5 MHz shall meet the provisions of 5.2.
5.1.4 Recommendation.- All installations of emergency
locator transmitters should operate on 406 MHz and
121.5 MHz simultaneously.
5.1.5 The technical characteristics for the 406 MHz
component of an integrated ELT shall be in accordance with
5.3.
5.1.6 The technical characteristics for the 121.5 MHz
component of an integrated ELT shall be in accordance with
5.2.
5.1.7 States shall make arrangements for a 406 MHz
ELT register. Register information regarding the ELT shall be
immediately available to search and rescue authorities.
5.2 SPECIFICATION FOR EMERGENCY
LOCATOR TRANSMITTERS (ELT)
FOR SEARCH AND RESCUE
OPERATING ON 121.5 MHz
Note.- Information on technical characteristics and
operational performance of 121.5 MHz ELTs is contained in
RTCA Document 00-183 a d Eumpean Organization for
Civil Aviation Electronics (EUROCAE) Rocment ED.62.
5.2.1 Technical, characteristics
5.2.1.1 Emergency locator transmitters (ELT) shall
operate on 121.5 MHz. The frequency tolerance shall not
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