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phrase "aircraft Dm' will be used for the subnetwork
entity jn an aircraft communicating with the station. A
subnetwork entity is a packet layer entity as defined in IS0
6.1.2.2 Ground station radio frequcrr~y range. A ground
station shall be capable of operating on its assigned channel
within the spectrum detailed in 6.1.2.1.
6.1.2.3 Common signalling channel. Frequency
136.975 MHz shall be used as a world-wide common signalling
channel (CSC) for VDL Mode 2 to announce the
availability of any VDL services.
6.1.3 System capabilities
The VDL communications functions shall meet the general
requirements in 6.1.3.1 through 6.1.3.4 below.
8208.
6.1.3.1 Data transparency. The VDL system shall provide
Subnetwork layer. The layer that establishes, manages, and code-inde~endentb~~ te-inde~endetnrat nsfer of dataterminates
connections across a subnetwork.
6.1.3.2 Broadcast. The VDL system shall provide link
System. A VDL-capable entity. A system comprises one or layer broadcast services.
more stations and the associated VDL management entity.
A system may either be an aircraft system or a ground 6.1.3.3 Co~~nectiomna nagement. The VDL system shall
system. establish and maintain a reiiable communications path
T. The baud period or lhaud rate.
between the aircraft and the ground system while allowing but
not requiring manual intervention.
Unicast. A transmission addressed to a single station
Note.- 111 this context "reliable" is defined by the BER
VDL management entity. A VDL-specific entity that provides requirement specified in 6.3.5.1.
the quality of service requested by the ATN-defined
SN-SME. A VME uses the LMEs (that it creates and 6.1.3.4 Ground rtctwork transition. A VDL-equipped
destroys) to enquire the quality of service available from aircraft shall transition from one ground station to another
peer systems. when circumstances dictate.
6/11/97
No. 72
Annex 10 - Aeronautical Telecommunications Volume ZII
6.1.4 Air-ground VHF digital
link communications
system characteristics
6.1.4.1 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:
6.1.4.1.1 The radio frequencies used shall bc selected
from the radio frequencies in the band 117.975 - 137 MHz in
accordance with 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 specifies that the block of frequencies
from 136.9 - 136.975 M* inclusive is reserved for VHF uirground
digital communications.
6.2.4 Adjacent channel emissions
6.2.4.1 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 0 dBm.
6.2.4.1.1 After 1 January 2002;the amount of power from
all new installations of a VDL ground transmitter under all
operating conditions when measured over the 25 kHz channel
bandwidth of the first adjacent channel shall not exceed
2 dBm.
6.2.4.2 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 a m .
6.1.4.1.2 The design polarization of emissions shall be
vertical. 6.2.4.2.1 After 1 January 2002, the amount of power from
all new installations of a VDL ground transmitter under all
operating conditions when measured over the 25 Mlz channel
bandwidth of the second adjacent channel shall be less than
6.2 SYSTEM CHARACTERISTICS OF minus 28 a m .
THE GROUND INSTALLATION
6.2.4.2.2 After 1 January 2002, the amount of power from
6.2.1 Ground station all new installations of a VDL ground transmitter under all
transmitting function operating conditions when measured over the 25 kHz channel
bandwidth of the fourth adjacent channel shall be less than
6.2.1.1 Frequency stability. The radio frequency of VDL minus 38 dBm, and from thereon it shall monotonically
ground station equipment operation shall not vary more than decrease at the minimum rate of 5 dB per octave to a
plus or minus 0.0002 per cent (2 parts per million) from the maximum value of minus 53 dBm.
assigned frequency.
Note.- The frequency stability for VDL ground stations 6.2.4.3 The amount of power from a VDL ground
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