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voice channel type and enhanced provisions for interoperability I7 July 2000
among AMSS systems; changes to the VDL SARPs to reduce 2 November 2000
potential interference to current VHF voice communication systems
caused by VDL transmitters; changes to the VHF voice communication
SARPs to enhance immunity to interference from VDL
transmitters on board the same aircraft.
Aeronautical telecommunication network (ATN) system management, I2 March 2001
security and directory services; removal of detailed material relating 16 July 200L
to CIDIN; integrated voice and data link system (VDL Mode 3); data 1 November 2001
link satisfying surveillance applications (VDL Mode 4); deletion of all
the provisions for VDL Mode 1; removal of the detailed technical
specifications for VDL Mode 2; aeronautical speech circuits; update
of references to the ITU Radio Regulations.
UlyOl
No. 76
Annex 10 - Aeronautical Telecommunications Volume ZZI
Adopted
Effective
Amendment Source(s) Subject(s) Applicable
77 Secondary Surveillance Radar Mode S subnetwork (Part I), aircraft addressing system (Part I). 27 February 2002
Improvements and Collision IS July 2002
Avoidance Systems Panel 28 November 2002
(SICASP)
78 Air Navigation Commission Changes to technical specifications relating to radio frequency 5 March 2003
channels; introduction of registration requirement for ELTs; 14 July 2003
incorporation of VDL Modes 3 and 4 in the table of ATN subnetwork 27 November 2003
priorities (Table 3-3); editorial amendments.
79 Eighth meeting of the Changes to technical specifications relating to high frequency data 23 February 2004
Aeronautical Mobile link (HFDL) to align them with relevant provisions of ITU RR, 12 July 2004
Communications Panel introduction of FM immunity characteristics for VDL Mode 4; 25 November 2004
( AMCP) deletion of the note indicating that VDL Mode 4 SARPs apply to
surveillance applications.
80 Air Navigation Commission Provisions for the location protocols for use in emergency locator 25 February 2005
transmitters (ELTs) operating on the 406 MHz frequency. 11 July 2005
24 November 2005
APPENDIX 1 TO CHAPTER 5. EMERGENCY LOCATOR
TRANSMITTER CODING
(see Chapter 5, 5.3.2)
Note.- A detailed description of beacon coding is 2.3 Protected data field
contained in Specification for COSPAS-SARSAT 406 MHz
Distress Beacons (C/S T.OO1). The following technical spec@ 2.3.1 The protected data field consisting of bits 25
cations are specific to emergency locator transmitters used in through 85 shall be protected by an error correcting code, and
aviation. shall be the portion of the message which shall be unique in
every distress ELT.
1. GENERAL
I. 1 The emergency locator transmitter (ELT) operating
on 406 MHz shall have the capacity to transmit a programmed
digital message which contains information related to the ELT
and/or the aircraft on which it is carried.
1.2 The ELT shall be uniquely coded in accordance with
1.3 below and be registered with the appropriate authority.
1.3 The ELT digital message shall contain either the
transmitter serial number or one of the following information
elements:
2.3.2 A message format flag indicated by bit 25 shall be
set to "I)" to indicate the short message format or set to "1" to
indicate the long format for ELTs capable of providing
location data.
2.3.3 A protocol flag shall be indicated by bit 26 and shall
be set to "I" for user and user location protocols, and "0 for
location protocols.
2.3.4 A country code, which indicates the State where
additional data are available on the aircraft on which the ELT
is carried, shall be contained in bits 27 through 36 which
designate a three-digit decimal country code number expressed
in binary notation.
a) aircraft operating agency designator and a serial number; Note.- Country codes are based on the international
b) 24-bit aircraft address;
Telecommunication Union (ITU) country codes shown in
Table 4 of Part I. Volume I of the ITU List of Call Signs and
c) aircraft nationality and registration marks. Numerical Identities.
1.4 All ELTs shall be designed for operation with the 2.3.5 Bits 37 through 39 (user and user location proto-
COSPAS-SARSAT* system and be type approved. cols) or bits 37 through 40 (location protocols) shall designate
one of the protocols where values "001" and "01 1" or "001 l",
Note.- Transmission characteristics of the ELT signal can "0100, "0101", and "1000" are used for aviation as shown in
be confirmed by making use of the COSPAS-SARSAT Type the examples contained in this Appendix.
　
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