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AES shall reassociate and reorder the received SUs into an SU
set according to their application reference number
(Appendix 3 to Chapter 4, Item 4j, sequence numbers (Appendix
3 to Chapter 4, Item 59) and Q numbers (Appendix 3 to
Chapter 4, Item 43). Following receipt of an ISU, the AES
shall determine whether or not any more SSUs corresponding
to the SU set headed by the ISU are expected from the GES
in accordance with the following criterion:
No more SSUs corresponding to the SU set are expected
if either the last SSU in the SU set or a fill-in SU is
received, or if the channel is released.
If an ISU or an LSU with a Q number equal to the Q number
of the SU set awaiting completion. is received, the AES shall
discard the incomplete SU set awaiting completion.
4.6.6.3.2.1 If no more SUs corresponding to a
transmission of an SU set are expected, the AES shall
determine whether or not there are any missing SUs. The AES
shall then do the following:
Annex 10 - Aeronautical Telecommunications Volume III
a) if there are no missing SUs, the AES shall reassemble
the SUs into an LIDU according to 4.6.3.4.3 and pass
the LIDU to the appropriate link service user in the
ms ;
b) if there are any missing SUs. the AES shall not
generate an LIDU from the received incomplete SU
set: instead, the AES shall store the received SUs until
the other missing SUs are received ii a retransmission
of the SU set, or until the channel is released.
4.6.6.3.3 C channel crosstulk detection. If a received SU
or SU set contains an AES ID or application reference number
which differs from that which prevailed when the C channel
was established, the AES shall command the AES
management to inhibit transmission on the C channel
frequency and command the AES circuit-mode services to
terminate the call.
4.6.7 Sub-band C channel
from-aircraft protocol
Note.- In 4.6.7, the use of the rernzs "AES" and "GES"
refers to the link layer functions for the sub-band C channel
from-aircraf? protocol within the AES and the GES.
The link layer functions for an individual sub-band C channel
in the from-aircraft direction shall be as defined in 4.6.7.2 and
4.6.7.3.
4.6.7.2 AIRCRAFTEA RTH STATION (AES)
4.6.7.2.1 Upon receipt of an LIDU from the circuitmode
link sewice user (Table 4-38) or the AES management
(Table 4-44), the AES link layer shall generate the
corresponding SU set according to 4.6.6.2.1.
4.6.7.2.2 Among all the SUs awaiting transmission, the
oldest of the SUs with highest Q number shall always be
transmitted first. The SUs of an SU set comprisedof multiple
SUs shall be transmitted in the descending order of their
sequence numbers (Appendix 3 to Chapter 4, Item 59).
Note.- The sub-band C channel link layer in the AES
does not assign a reference number to the tlDU receivedjl-om
the circuit-mode link service user: Instead an upplication
reference number is assigned by the circuit-mode services and
is passed to the link layer irr the LICI.
4.6.7.2.3 If there are no SUs to be transmitted, the AES
shall transmit fill-in SUs (Appendix 2 to Chapter 4! Figure
A2-42).
4.6.7.3 GROUND EARTH
STATION (GES)
4.6.7.3.1 For an SU set comprised of an LSU, the GES
shall form an LlDU according to 4.6.6.3.1 and pass the LlDU
to the appropriate link services user in the GES.
4.6.7.3.2 For an SU set comprised of multiple SUs, the
GES shall reassociate and reorder the received SUs into an SU
set according to their application reference number (Appendix
3 to Chapter 4. Item 4). sequence numbers (Appendix 3 to
Chapter 4, Item 59) and Q numbers (Appendix 3 to Chapter 4,
Item 43). Following receipt of an ISU, the GES shall determine
whether or not any more SSUs corresponding to the SU
set headed by the ISU are expected from the AES in accordance
with the following criterion:
No more SSUs corresponding to the SU set are expected
if either the last SSU in the SU set or a fil.1-in SU is
received, or if the channel is released.
If an ISU or an LSU with a Q number equal to the Q number
of the SU set awaiting completion is received, the GES shall
discard the incomplete SU set awaiting completion.
4.6.7.3.2.1 If no more SUs corresponding to a transmission
of an SU set are expected, the GES shall determine
whether or not there are any missing SUs. The GES shaIl then
do the following:
aj if there are no missing SUs, the GES shall reassemble
the SUs into an LIDU according to 4.6.3.4.3 and pass
the LIDU to the appropriate lijc service user in the
GES ;
b) if there are any missing SUs, the GES shall not
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