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respect to the reception time of the last received SPDU.
1 1.3.2.4.5 SPECIFIED PACKET ERROR RATE PERFORMANCE
The number of HFDL media access protocol data units
(MPDUs) received with one or more bit errors shall not exceed
5 per cent of the total number of MPDUs received, when using
a 1.8 second interleaver and under the signal-in-space
conditions shown in Table 11-3.
The DLS protocol shall be used to broadcast unsegmented
uplink high frequency network protocol data units
(HFNPDUs) and other HFNPDUs not requiring automatic
retransmission by the link layer.
11.3.4 Subnetwork layer
Note.- Details on subnetwork layer protocol~'a nd services
are contained in the Manual on Detailed Technical
Specifications for the High Frequency Data Link (HFDL).
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Annex 10 - Aeronautical Telecommunications Volume ZZZ
1 1.3.4.3.2 SUBNE~WORK ACCESS FUNCTION
The BFDL subnetwork layer in the HFDL aircraft station
sub-system and HFDL ground station sub-system shall provide
connection-oriented packet data service by establishing
subnetwork connections between subnetwork service users.
The 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 IS0 8208 packets. It shall perform the IS0 8208
DCE function in the HFDL aircraft station sub-system and the
HFDL ground station sub-system.
1 1.3.4.2 CONNECTIVITY NOTIFICATION SERVICE
1 1 3.4.3.3 IWERWORKING FUNCTION
The HFDL subnetwork layer in the HFDL aircraft station
sub-system shall provide the additional connectivity notification
service by sending connectivity notification event
messages to the attached ATN router.
11.3.4.2.1 COnihEcTIVITY NOT~FICATIONE VENT MESSAGES
The connectivity notification service shall send connectivity
notification event messages to the attached ATN router through
the subnetwork access function.
11.3.4.3 HFDL SUBNETWORK LAYER FUNCTIONS
The HFDL subnetwork layer in both the HFDL aircraft station
sub-system and HFDL ground station sub-system shall include
the following three functions:
The interworking function shall provide the necessary
harmonization functions between the HFSND, the subnetwork
access and the connectivity notification functions.
11,4 GROUND MANAGEMENT
SUB-SYSTEM
Note.- Details on the $round management sub-system
functions and integaces are contained in the Manual on
Detailed Technical Specifications for the High Frequency Data
Link (HFDL).
11.4.1 Management functions
a) HFDL subnetwork dependent (HFSND) function;
b) subnetwork access function; and
c) interworking function.
The ground management sub-system shall perfom the
functions necessary to establish and maintain communications
channels between the BFDL ground and aircraft station
sub-systems.
11.3.4.3.1 HFSND FUNCTION
11.4.2 Managementlcontml information exchange
The HFSND function shall perform the HFSND protocol
between each pair of HFDL aircraft station sub-systems and
HFDL ground station sub-systems by exchanging BFNPDUs.
It shall perform the HFSND protocol aircraft function in the
HFDL aircraft station sub-system and the HFSND protocol
ground function in the HFDL ground station sub-system.
The ground management sub-system shall interface with the
ground station sub-system in order to exchange control
information required for frequency management, system table
management, log status management, charnel management,
and quality of service (QOS) data collection.
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Table 11-3. HF signal-in-space conditions
Fading
bandwidth (Hz) Frequency
Data rate , Number of Multipath spread per CCIR offset
(bits per second) channel paths (milliseconds) Report 549-2 (HZ)
1 200 1 fixed - - 40
1 800 2 fading 2 1 40
1 200 2 fading 2 1 40
600 2 fading 2 1 40
300 2 fading 2 1 40
Signal to noise
ratio (dB)
in a 3 kHz
bandwidth
4
16
11.5
8
5
MPDU size
(octets)
256
400
256
128
64
Table 11-3a. HF signal-in-space conditions
Fading Signal to noise
bandwidth (Hz) Frequency ratio (dB)
Data rate Number of Multipath spread per CCZR offset ina3Edlz MPDU size
(bits per second) channel paths (milliseconds) Report 549-2 (HZ) bandwidth (octets)
1200 2 fading 4 1 40 13 256
1 200 2 fading 2 2 40 11.5 256
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CHAPTER 4. AERONAUTICAL SPEECH CIRCUITS
4.1 TECHNICAL PROVISIONS RELATING
　
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