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circuit-mode link service user: Instead an application reference
number is assigned by the circuit-mode services and is passed
ro the link layer in the LICI.
4.6.6.2.3 If there are no SUs to be transmitted, the
GES shall transmit fill-in SUs (Appendix 2 to Chapter 4,
Figure A2-42).
4.6.6.3 AIRCRAFT EARTH STATION (AES)
4.6.6.3.1 For an SU set comprised of an LSU, the AES
shall form an LIDU containing only L'ICI and pass the LIDU
to the appropriate link service user in the AES. The LICI shall
be generated from the control information in the received LSU.
4.6.6.3.2 For an SU set comprised of multiple SUs, the
AES shall reassociate and reorder the received SUs into an SU
set according to their application reference numbcr (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 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 comsponding 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 a.re expected, the AES shall
determine whether or not there are any missing SUs. The AES
shall then do the following:
2/11/00
No. 75
Pati I Annex 10 - Aeronautical Telecommunicartions
a) if there are no missing $Us, 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
AES ;
b) if therc are any missing SUs, the AES shall not generate
an LDU from the received incomplete SU set: instead,
the AES shall store the received SUs until the other
missing SUs are received in a retransmission of the SU
set, or until the channel is released.
4.6.6.3.3 C channel cmsstalk 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 terms "AES" and "GES"
refers to the link layerficmti~mfo r the sub-bond C channol
from-aircrafl 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 AIRCRAFT EARTH STATION (AES)
4.6.7.2.1 Upon receipt of an LIDU from the circuit-mode
link service 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 comprised of 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 LDU received-from the
circuit-mode link service user lnstead an application reference
ntimber is assigned by the circuit-mode services and is passed
to the link layer in the LICI.
4.6.7.2.3 If here 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 GROUNDE ARTH
STATION (GES)
4.6.7.3.1 For an SU set comprised of LSU, the GES
shall form an EDU according to 4.6.6.3.1 and pass the LIDU
to the appropriate link services user in the GES.
4.6.7.3.2 For an SU set comprised of multiple $Us, the
GES shall reassociate and reorder the receive? 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 numhrs (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 fill-in SU is received,
 
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