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physical layer.
d) additive Gaussian and broadband impulsive noise with
varying amplitude and random arrival limes.
11 3.3.2 LINK MANAGEMENT
Note.- R~ferenccC CJR Report 549-2.
The link layer shall manage TDMA slot assignments, log-on
and log-olf procedures, ground station and aircraft station
TDMA synchronization, and other functions necessary, t<aking
Upon receipt of the prcarnble segment the reccivcr shall: into account message priority, for the estahlishmenl and
maintemcc of communications.
a) detccl the beginning of a burst of data:
b) measure and correct the frequency offset between the 11.3.3.3 DATA SERVICE PROTOCOI-S
transrnittcr and receiver due to Doppler shift and
transmitterlreceivcr frequency offsets; The link layer shall support a reliable link servicc (RLS)
protocol and a direct link scrvice (DLS) protocol.
c) determine lhc data rate and interleaver sellings to use
during data demodulation: 11.3.3.3.1 RLS
d) achieve M;-PSK symbol synchronization; and
e) train the equalizer.
The RLS protocol shall be used to exchange acknowlcdged
uscr data packets between aircraft and ground peer link layers.
Each HFDL aircraft station sub-system shall synchronize its The DLS protocol shall be used to broadcast unsegmented
slot timing to that of its corresponding ground station with uplink high frequency network protocol data unjts
respect to the reception time of the last received SPDU. (HlWPDUs') and other HFNPDUs not requiring automatic
rclransmission by the llnk layer.
1 2.3.2.4.5 SPECIFIEDP ACKET ERROR R4TE PERFORbfANCE
The number of HFDL media access protocol data units
(MPDUs) receivcd with one or more bit errors shall not exceed 11.3.4 Subnetwork layer
5 per cent of Lhe tolal number of MPDUs received, when using
a 1.8 second interleaver and under the signal-in-space Note.- Derails on snbne~vork h e r protocols and scnices
conditions shown in Table 11-3. cue conrained in the Manual on HF Data Link tfjoc 974 1).
Annex 10 - Aerunaurical Telecommunications Volume ZZZ
1 1 3.4.1 PACKETD ATA
Thc 1-IFDL subnetwork layer in the HFDL aircraft station
sub-system and HFDL ground station sub-system shall provide
connection-oriented packet data service by es~abIishing
subnetwork connections between subnetwork service users.
11 .3.4.3.2 S~/BNETIVORKAC CESS FUhrC770N
Thc subnetwork access function shall perform the IS0 8208
protocol between the HFDL aircraft station sub-system or
HFDL ground station sub-system and the attached routers by
exchanging TSO 8208 packcls. It shall peribrm the IS0 8208
DCE function in the HFDL aircraft station sub-system and the
HFDL ground station sub-system.
1 1.3.4.2 CONNECTIVITNYO TlFlCATlON SERVICE
1 1 3.4.3.3 INTER WORKlhrG FUNCTION
The HFDL subnetwork layer in the HFDL aircraft station
sub-system shall provide the additional connectivity notification
service by sending conneclivity notification event
messages to the attached ATN roulcr.
11.3.4.2.1 CONNECTJMTY A'O77FlCil7701V EVENT MESS.4GES
The connectivity notification scrvice shall send connectivity
notification cvcnl messages to the attached ATN routcr
through the subnetwork access function.
11.3.4.3 HFDL SUBNETWORK LAYER FUNCTIONS
The IlFDL subnetwork layer in both the HFDL aircraft station
sub-systcm and HFDL ground station sub-system shall include
the following three functions:
a) HFDL subnetwork dependent (I-IFSND) function;
b) subnetwork access function; and
C) interworking function.
The HFSND function shall perform the HFSND protocol
between each pair of HEDL aircraft station sub-systems and
HFDL ground station sub-systems by exchanging HFI'TDUs.
It shall perform the HFSND protocol aircraft function in the
IWDL aircraft station sub-system and the HFSND protocol
ground function in the HFDL ground station sub-system.
The intcrworhng function shall providc the ncccssary
harmonization functions between the HFSND, the subnetwork
acccss and Ihc connectivity notification functions.
11.4 GROUND MANAGEMENT
SUB-SYSTEM
Note.- Details on the ground management sub-syxtem
Lfunctions and intefices are contained in the Manual on HF
Data Link (Doc 9741 ).
11.4.1 hlanagcmcnt functions
The ground rnanagcmcnt sub-system shall perfonn the
functions necessary to establish and maintain communications
channels between the HFDL ground and aircraft station
sub-systems.
11.4.2 ManagcmenVcontrol information exchange
The ground management sub-system shall interface with the
ground station sub-system in order to exchange control
information required for frequency mmagement, system table
management, log status managcmcnr, ohanncl management.
　
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