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Figure A7-2. Error detection/correctioa process
Annex 10 - Aeronautical Telecom~nunications
271'1 1/03
No. 78
TI-11s PAGE LNTENTIONALLY LEFT BLANK
Volume ZZZ
Part 1 Annex 10 - Aero~zarrticat Telecommunicafiom
Note 2.- A~l~lilionacoi -ordirzation kvitfz ITU is r-eqrriwd in Table 4-26 for message priorilies 7 through 14, shall not
cases where DOC wens nrr not irl corfurrnity with tile excced the values olTable 11-1.
allotnzerlt urerrs specjfiecl bz iize ITU Rndio Reg~i1ntion.s.
Table 11-1. Transfer delays
11.2.3 Requirements for carriage of
HFDL equipment
Requirements for nlandatory carriage of HFDL equipment
shall bc madc on h e basis of regional air navigation
agrccmenls that specify the airspace of operation and the
implcmcnlalion Limc-scale.
1 1.2.3.1 NOTICE
The agrecmcnl abovc shall provide advance notice of at least
two ycars for the mandatory carriage of airborne systems.
11.2.4 Ground station networking
1 1.2.4.1 Recommendation.- HFDL ground station
sub-system should interconnect through a common ground
nzanngement sub-system.
Note.- This provides a distributed sr~hnetwork, with a
subnetwork point of attachment (SNF'A), depending on the
method of inzplementatzon, which allows for the maintenance
of virtual circu~t connections as aircrqft stations transition
between designuted oj,eratzonal coverage areas. The
distribution may be mnlri-reglonu1 or world-wide.
11.2.5 Ground station synchronization
Synchronization of HFDL ground station sub-systems shall be
to within k25 ms of UTC. For any station not operating within
+25 ms of UTC, appropriate notification shall be made to all
aircraft and ground station sub-syslcms to allow for continued
system operation.
11.2.6 Quality of service
1 1.2.6.1 RESIDUAL PACKET ERROR RATE
The undctccled error rate for a network user packet which
contains betwccn 1 and 128 octets of user data shall bc cqual
to or less than 1 in lo6.
1 1.2.6.2 SPEED OF SERVICE
Transit and transfer delays for netwol-k user packets
(128 octets) with priorilies defined in Part I, Chapter 4,
11.3 HF DATA LINK PROTOCOL
Transit dehy
Transfer delay
(95 percentile)
The HFDL protocol shall consist of a physical layer, a link
layer, and a subnetwork layer, as specified bclow.
Direction Priority Delay
To-aircraft 7 through 14 45 s
From-aircraft 7 through 14 60 s
To-aircraft 1 1 through 14 90 s
7 through 10 120 s
From-aircraft 1 1 through 14 150 s
7 through I0 250 s
Note.- The HFDL protocol is a layered protocol and is
pornpatible with the open systems interconnection (QSI)
reference model. It permits the UFDL to function as an
aeror~a~iticutle lecommunication network (ATN)-compatible
subnetwork. The details of the protocol are described in rhe
Manual on HF Data Link (Doc 9741).
11.3.1 Physical layer RF characteristics
The aircraft and ground stations shall access the physical
medium operating in simplex mode.
1 1.3.1.1 FREQUENCBAYN DS
HFDL installations shall be capable of operaling at any single
sideband (SSB) carrier (reference) frequency available to the
aeronautical mobile (R) scrvice in the band 2.8 to 22 MHz,
and 111 compliance with the relcvant provisions of the Ratlio
Regulations.
Channel utilization shall be in conrormity with the tablc of
carricr (reference) frequencies 01 Appcndix 527 to the ITU
Radio Rcgulalions.
11.3.1.3 TUNING
The equipment shall be capable of operating on integral
multiples of 1 kHz.
27/11/03
No. 78
Anncx 10 - Acrnnaafical Telccomrnnnicatinns Volume TZZ
The sideband used [or transmission shall bc on the highcr side
of its carrier (reference) frequency.
1 1.3.1.5 MODULATION
HFDL shall cmploy Mary phase shin kcying (M-PSK) to
~nodulate the radio frequency carrier at the assigned frequency.
The symbol rate shall be 1 SO0 synlbols pcr second 510 parts
per million (i.e. 0.018 symbols per secondj. Thc valuc ol AM and
the informalion data rate shall bc as spccilicd in Tablc 11-2.
Table 11-2. J'alue of M ar~din formation data rate
Ir~ormalion data rate
A4 (bits per second)
. . . -
7, 300 or 600
4 1 200
8 1 800
P(D = 1. if 0 .r If - fol c (1 - hM2T
P(t? = cos (~(21flT- 1 + h)14b). if (I - b)/2T .r If - fO1 .r (1 + b)l2T
P(f) = 0. if If - fol (1 + b)12T
where he spectral roll-off parameter, b = 0.31, has bccn
chosen so that the -20 dB points of the signal are at SSB
carrier (reference) + 290 Hz and SSB carrier (reference) +
2 590 Hz and the peak-to-average power ratio of the waveform
is less than 5 dB.
　
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