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system operation.
11.2.6 Quality of service
1 1.2.6.1 RESIDUALP ACKET ERROR RATE
The undetected error rate for a network user packet which
contains between 1 and 128 octets of user data shall be equal
to or less than 1 in 1 06.
11.2.6.2 SPEED OF SERVICE
11.3 HF DATA LINK PROTOCOL
Transit delay
Transfer delay
(95 percentile)
The HFDL protocol shall consist of a physical layer, a link
layer, and a subnetwork layer, as specified below.
Note.- The HFDL protocol is a layered protocol and is
compatible with the open systems interconnection (OSI)
reference model. It permits the HFDL to function as an
aeronautical telecommunication network (ATN)-compatible
subnetwork. The details of the protocol are described in the
Manual on HF Data Link (Doc 9741).
Direction Priority Delay
To-aircraft 7 through 14 45 s .
From-aircraft 7 through 14 60 s
To-aircraft 11 through 14 90 s
7 through 10 120 s
From-aircraft 11 through 14 150 s
7 through 10 250 s
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 FREQUENCY BANDS
HFDL installations shall be capable of operating at any single
sideband (SSB) carrier (reference) frequency available to the
aeronautical mobile (R) service in the band 2.8 to 22 MHz,
and in compliance with the relevant provisions of the Radio
Regulations.
Channel utilization shall be in conformity with the table of
carrier (reference) frequencies of Appendix 27 to the ITU
Radio Regulations.
Transit and transfer delays for network user packets The equipment shall be capable of operating on integral
(128 octets) with priorities defined in Part I, Chapter 4, multiples of 1 kHz.
2511 UM
No. 79
Annex 10 - Aeronautical Telecommunications Volume I11
1 1.3.1.4 SIDEBAND p(f) = 1, ifO<lfl <(1 - b)/2T
P(f) = cos (x(2lfl-~ 1 + b)14b), if (1 - b)nT < If1 < (1 + by2T
The sideband used for transmission shall be on the higher side P(f) = 0, if If( > (1 + b)nT
of its carrier (reference) frequency.
where the spectral roll-off parameter, b = 0.31, has been
1 1.3.1.5 MODULATION chosen so that the -20 dB points of the signal are at SSB
carrier (reference) + 290 Hz and SSB canier (reference) +
HFDL M-ary phase shift keying (M-PSK) to 2 590 HZ and the peak-to-average power ratio of the waveform
modulate the radio fiequency canier at the assigned fiequency. is less than 5 dB.
The symbol rate shall be 1 800 symbols per second +10 parts
per million (i.e. 0.018 symbols per second). The value of M and
the information data rate shall be as specified in Table 11- 2. 11 .3.1.6 TRANSMITTESRTA BILITY
The basic fiequency stability of the transmitting function shall
Table 11-2. Value of M and information data rate be better than:
Informarion data rare a) +20 Hz for HFDL aircraft station sub-systems; and
M (bits per second)
2
b) k10 Hz for HFDL ground station sub-systems.
300 or 600
Note.- When M equals the value 2, the data rate may be The basic fiequency stability of the receiving function shall be
300 or 600 bits per second as determined by the channel such that, with the transmitting function stability specified in
coding rate. The value of M may change from one data 11.3.1.6, the over-all fiequency difference between ground and
transmission to another depending on the data rate selected. airborne functions achieved in service does not exceed 70 Hz.
The channel coding rate is described in the Manual on HF
Data Link (Doc 9741).
11.3.1.8 PROTECTlON
11.3.1.5.1 M-PSK CARRIER
A 15 dS desired to undesired (DN) signal ratio shall apply for
The M-PSK carrier expressed mathematically shall be defined the protection of CO-channela ssignments for HFDL as follows:
as:
s(t) = AZ(p(t-kT)cos[2xf0t + cp(k)]), k = 0, 1 . . . , N-1
where:
a) data versus data;
b) data versus voice; and
c) voice versus data.
N = number of M-PSK symbols in transmitted
physical layer protocol data unit (PPDU)
s(t) = analog waveform or signal at time t 11.3.1.9 CLASS OF EMISSlON
A = peak amplitude
fo = SSB carrier (reference) + 1 440 Hz The class of emission shall be 2K80J2DEN.
T = M-PSK symbol period (111 800 s)
cp(k) = phase of kth M-PSK symbol
p(t-kT) = pulse shape of kth M-PSK symbol at time t. 11.3.1.10 ASSIGNED FREQUENCY
Note.- The number of M-PSK symbols sent, N, defines the
length (duration = NT secondr) of the PPDU. These
parameters are defined in the Manual on HF Data Link
(Doc 9741).
The pulse shape, p(t), shall determine the spectral distribution
of the transmitted signal. The Fourier transform of the pulse
　
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