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support ATN-compliant subnetwork services for surveillance
applications.
6.9.5.1.1.2 Ground installation.
6.9.3.2 Datu tramparency. The VDL Mode 4 system shall Recommendation.- The effective radiated power should
provide code-independent, byte-independent transfer of data. be such as to provide aJield strength of ar leasr 75 microvolts
per metre (minus 109 dLIw/m2) within the defined operational
6.9.3.3 Broadcast*T he VDL Mode 4 system shall provide coverage of the facility, on the basis of f~e-spacep ropagation.
link layer broadcast services.
6.9.3.4 Point-to-point. The VDL Mode 4 system shall
provide link layer point-to-point services.
6.9.5.1.2 TRANSMITTER AND RECEIVER
FREQUENCY CONTROL
6.9.3.5 Air-air communiaation,s. The VDL Mode 4 system 6.9.5.1.2.1 The VDL Mode 4 physical layer shall set thc
shall provide air-air communications, without ground support, transmitter or receiver frequency as commanded by the link
as well as air-ground communications. management entity (LME). Channel selection time shall be
less than 13 ms after the receipt of a command from a VSS
6.9.3.6 Connection management. When supporting User.
air-ground operations, he VDL Mode 4 system shall establish
and maintain a reliable communications path between the
aircraft and the ground system while allowing, but not 6.9.5.1.3 DATA RECEPTION BY RECENER
requiring, manual intervention.
6.9.5.1.3.1 The receiver shall decode input signals and
6.9.3.7 Ground network transition. A mobile VDL forward them to the higher layers for processing.
Mode 4 DLS station shall transition from one ground VDL
Mode 4 DLS station to another as required.
6.9.5.1.4 DATA TRANSMISSION BY TRANSMITTER
6.9.3.8 Derived time capability. VDL Mode 4 shall
provide the capability for deriving time from time-of-arrival 6.9.5.1.4.1 Data encoding and transmission. The physical
measurements of received VDL Mode 4 transmissions layer shall mcode the data reccived from the data link layer
whenever exlernally derived estimates of time are unavailable- and transmit it over the RF channel. RP transmission shall take
place only whcn permitted by he MAC.
6.9.3.9 Simplex operations. Mobile and ground VDL
Mode 4 slations shall access the physical medium operating in 6.9.5.1.4.2 Orhr of transmission. The transmission shall
simplex mode. consist of the following stages in the following order:
1/11/01
No. 76
Part I Annex 10 - Aeronautical Telecommunications
a) transmitter power stabilization; 6.9.5.2.3 STAGESO F TRANSMISSION
bit synchronization; 6.9.5.2.3.1 Transmitter power stubilization. The first
segment of the training sequence is the transmitter power
ambiguity resolution and data transmission; and stabilization, which shall have a duration of 16 symbol
periods. The transmitter power level shall be no less than 90
d) transmitter decay. per cent of the stcady state power level at the end of the
transmitter power stabilization segment.
Note.- The definition,^ of the stages are given in Sections
6.9.5.2.3.1 to 6.9.5.2.3.4.
6.9.5.1.4.3 Automatic transmitter shutdown. A VDL
Mode 4 station shall automatically shut-down power to any
final stage amplifier in the event that output power from that
amplifier exceeds -30 dBm for more than 1 second. Reset to
an operational mode for thc affected amplifier shall require a
manual operation.
Note.- This is intended to protect the shared channel
resource against so-called "stuck tmnsmitters".
6.9.5.1.5 NOTIFICATION SERVICES
6.9.5.2.3.2 Bit synchronization. The second segment of
the training sequence shall be the 24-bit binary sequence 0101
0101 0101 0101 0101 0101, transmitted from left to right
immediately before the start of the data segment.
6.9.5.2.3.3 Ambiguity resolution and data transmission.
The transmission of the first bit of data shall start 40 bit
intervals (approximately 2083.3 microseconds) k 1 microsecond
after the nomi~lals tart of transmission.
Note I.- This is referenced to emissions at the output of
the antenna.
Note 2.- Ambiguity resolution is pe~ormed by the link
layer:
6.9.5.1.5.1 Signal quality. The operational parameters of 6.9.5.2.3.4 Trunsmitter decay. The transmitted power
the be monitored at the physical layer level shall decay at least by 20 dB within 300 microseconds
quality analysis shall be performed in the demodulator process after completing a transmission. The transmitter power level
and in the receive process. shall be less than -90 dBm within 832 microseconds after
completing a transmission.
Note.- Processes that may be evaluated in the
demodulntor include bit error rate (BER), signal to noise ratio
(SNR),a nd timing jitter Processes that may be evaluated in 6.9.5.3 CHANNESLE NSING
　
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