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1 1.3.1.13 UNDESIRED SIGNAL REIECTIOK
by the link layer. The physical layer shall perform transmitter
keying on rlcmand from the link layer to transmit a packct.
11 .3.2.2.1 T I L I N S ~ ~TIO~ REECREI VER TURNAROUND 77hIE
The transmitted power level shall decay at Least by 10 dB
within 100 milliseconds after completing a transmission. An
HFDL station sub-system shall be capable of rccciving and
demodulating, with nonlinal perfom~ance, an incoming signal
wilhin 200 milliseconds of the start of the subsequent receive
slot.
For HFDL aircraft and ground sta~ion receivers. undesired
input shall be in accordance with the An HFDL station sub-systcm shall provide nominal output
following: power within plus or minus l tlB to thc antenna tr,msmission
line within 200 milliseconds of the start of the transmit slot.
a) on any frequency bctween fc and (fc - 300 Hz), or
betwecn (f, + 2 900 Hz) and (f, + 3 300 Hz): at least
35 dB below thc peilk of the desired signal level; and 11.3.2.3 TRANSMISSOIFO DNA TA
b) on any frequency below (f, - 100 Hz), or above !f, + Transmission of data shall bc accomplished using a lime
3 300 HL): at lcast 60 dB below the peak of the desired clivision multiple access (TDMA) technique. The I-ImL data
signal level, link ground station sub-systems shall maintain TDYA frame
and slot synchronization lor the HFDL system. To ensure that
where fc is the carrier (reference) frequency. slot synchrotlization is mainlaincd, cach HF data link
modulator shall begin outputting a prc-key se,onlent at the
beginning of a time slot plus or minus 10 milliscconds.
11.3.1.14 RECEIVER RESI'ONSE TO TRANSIENTS
Rccnmm~ndation.- The rrceivinp firnction sho~tld 1 1.3.2.3.1 TD,II.IA S T R U ~ ~ R E
recover .f~-o~unlz i~zstantarl~eoiirnsc rease in power ot the
antennu tt.rminu/ of 60 dB nitllin 10 rrrillisecottds. Tile Each TDMA frame shall bc 32 seconds. Each TDMA frame
r~cei~~ifrnrgnc tinn shor~lrl mcover .from nn instanmneous shall be divided into thirteen equal duration slots as I'ollows:
decrease in RF po\vr<r ut rlze urzfenna rernzznal of 60 dB within
25 milliseconds. a) the first slot of each TDIMA framc shall be resenred for
usc by the HFDL ground station sub-system to broadcast
link management data in SPDU packets; and
11.3.2 Physical layer functions
The functions provided by thc physical layer shall include the
following:
aj transmitter and receiver control;
b) transmission of data; and
c) reception of data.
11.3.2.2 TIIANSYllTTER AKD RECEIVER CONTROL
The HFDL physical layer shali implcmcnr thc transmitterireceiver
switching and frequency tuning as comm~mded
b) thc remaining slots shall be designated either as uplink
slots, downlink slots rescrved for specific HFDL aircraft
station sub-systems, or as downlink random access slots
for use by all HFDL aircraft station sub-systems on a
contention basis. These TDMA slots shall bc assigncd
on a dynamic basis using a combination of rcscrvation,
polling and random access assignments.
The FIDL ground station sub-system shall broadcast a
squitter protocol data unll (SPDU) w e l y 32 seconds on
of its operating frequet~cies
Nore.-- Det~lils un the 7'DDbfA fi.a~ne and slot stnlctlrres,
pre-ke)) segtnenl, dulu r!nrat~r?Ps, inclilding T/IL' SPDC1, arc
con:iiitt~d iri file Manual on HF Data Link (Doc 9741).
Part I Annex 10 - ,,leronautical Telecommunications
1 1.3.2.4 RECEPTION OI; DATA
Each HFDL aircraft station shall automatically search the
assigned frequencies until it detects an operating frequency.
Recommendatinn.- Tlze n~frrrbrr of HFUL MPDUs
recrlved ir~~roln~e or nznrc hit errors shorlld nor exceed
5 per cent qf r/lr tofcd n~lrnber of ItlYnUs receil cci, \rrl/ien
irsrng a 1.8 second interlenvcr under the condrtrons shown in
Tuhle 11-30.
11.3.3 Link layer
The HF data link receiver shall provide (he means to detect,
synchronize, demodulate and decodc PPDUs modulatcd
according to the wavchrm defined in 11.3.1.5, subject to thc
following distortion:
a) the 1 440 Hz audio calrier ofket by plus or minus
70 Hz:
ti) discrete and/or diffusc multipalh distortion with up to
5 ms multipath spread;
Note.- Details on lznk layerfunctions are contained in the
Manual on HF Data Link (Doc 4741).
The link layer shall provide control functions for the physical
layer, link nlanagcment and data service protocols.
1 1.3.3.1 CONTROFLU NCTIONS
The 11~kla yer shall pass cnmnlands for frequency tuning, c) multipath amplitude fading with up to 2 Hz two-sided
transmitter keying and transmittcrlreceiver switching to the RMS Doppler sprcad and Rayleigh stalislics; and
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