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I
MP=1
I I
I I
I LENGTH = 0 I
L-------------------------------------------------L-L--LL-------------J
Figure 5-20. MULTIPLEX packet
SP=3
7/11/96
No. 71
ST=O OF FILL
Part Z Annex I0 - Aeronautical Telecommunications
Figure 5-21. SHORT FORM MSP packet
Figure 5-22. LONG FORM MSP packet
7/11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume ZII
DATA PACKET
- SHORT MSP
- LONG MSP
CALL REQUEST
CALL ACCEPT
. CLEAR REQUEST
CLEAR CONFIRMATION
RECEIVE READY
RECEIVE NOT READY
RESET REQUEST
. RESET CONFIRMATION
ROUTE
INTERRUPT
. MULTIPLEX
INTERRUPT CONFIRMATION
REJECT
UNASSIGNED
UNASSIGNED
LEGEND:
DP = DATA packet type
MP = MSP packet type
SP = SUPERVISORY packet
ST = SUPERVISORY type
SS = SUPERVISORY subset
Figure 5-23. Cantrol fields used in MODE S packets
7/11/96
No. 71
CHAPTER 6. VHF DIGITAL LINK (VDL)
6.1 AIR-GROUND VHF DIGITAL LINK
COMMUNICATIONS SYSTEM
CHARACTERISTICS
Note.- Drafr SARPs f o ~in particulal; the physical layel;
the link layer and the subnetwork layer are currently being
validated.
6.1.1 The characteristics of the air-ground VHF digital
link (VDL) communications system used in the international
aeronautical mobile service shall be in conformity with the
following specifications:
6.1 -1 .I The radio frequencies used shall be selected from
the radio frequencies in the band 11 7.975 - 137 MHz subject
to the conditions of Radio Regulation 595. The lowest
assignable frequency shall be 118.000 MHz and the highest
assignable frequency shall be 136.975 MHz. The separation
between assignable frequencies (channel spacing) shall be
25 kHz.
Note.-- Volume V speciJies that the block of frequencies
from 136.9 - 136.975 MHz inclusive is reserved for VHF airground
data link communications.
6.1.1.2 The design polarization of emissions shall bc
vertical.
6.2 SYSTEM CHARACTERISTICS OF
THE GROUND INSTALLATION
6.2.1 Ground station transmitting function
6.2.1.1 Frequency stability. The radio frequency of VDL
ground station equipment operation shall not vaty more than
plus or minus 0.0002 per cent (2 parts per million) from the
assigned frequency.
Note.- The frequency stabili~ for rransirional VDL
ground implementations using DSB-AM modulatiort is
specifed in Volunte III, Part II. Chapter 2 for 25 kHz channel
spacing.
Recommendation.- The effective radiated power
should be sudr as to provide a field strength of at least 75
microvolts per rrratre (minus 109 dBw/m2) within the defined
operational cowrage of the facility, on the basis offree-space
propagation.
6.2.1.3 SPURIOUESM ISSIONS
6.2.1.3.1 Spurious emissions shall be kept at the lowest
value which the state of the technique and the nature of the
service permit.
Note.- Appendix 8 to the Radio Regulations contains the
tolerances for the levels of spurious emissions to which
transmitters ?nust confonn in accordance with Radio Regulation
304.
6.2.1.4 ADJACENCTH ANNEL EMISSIONS
6.2.1.4.1 The amount of power from a VDL ground
transmitter under all operating conditions when measured over
the 25 kHz channel bandwidth of the first adjacent channel
shall not exceed O dBm.
6.2.1.4.2 The amount of power from a VDL ground
transmitter under all operating conditions when measured over
the 25 kHz channel bandwidth of the second adjacent channel
shall be less than minus 25 dBm and from thereon it shall
monotonically decrease at the minimum rate of 5 dB per
octave to a maximum value of minus 52 dBm.
6.2.1.4.3 The amount of power from a VDL ground
transmitter under all operating conditions when measured over
a 16 kHz channel bandwidth centred on the first adjacent
channel shall not exceed minus 20 dBm.
6.3 SYSTEM CHARACTERISTICS OF
THE AIRBORNE INSTALLATION
6.3.1 Frequency stabiliiy, The radio frequency of VDL
airborne equipment shall not vary more than plus or minus
0.0005 per cent (5 parts per million) from the assigned
frequency.
Note.- The frequency stability for transitional VDL
airborne implementations using DSB-AM modulation is
specifzed in Volunte Ifi, Part 11, Chapter 2 for 25 kHz channel
spacing.
6.3.2 Power The effective radiated power shall be such
as to provide a field strength of at least 20 microvolts per
metre (minus 120 dJ3wlrn2) (minus 87 dBm) on the basis of
free space propagation, at ranges and altitudes appropriate to
the operational conditions pertaining to the areas over which
　
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