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before another SU set for this AES with the same Q number.
4.5.7.3.2 Upon receipt of SUs comprising an SU set, the
AES shall reassociate the received SUs into an SU set according
to their reference numbers, Q numbers and sequence
numbers (Appendix 3 to Chapter 4, Items 43, 46 and 59,
respectively). For such an SU set, if an SSU is received
without its corresponding ISU or RTX SU having been
received, the AES shall discard the SSU.
4.5.7.3.3 For an SU set comprised of multiple SUs,
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 an SU of lower Q
number than the one awaiting completion, or an SU with
the same Q number as the one awaiting completion but
with a different reference number, or an AES system table
broadcast SU, or a fill-in SU, is received.
Note.- To apply this criterion, the AES considers all
received SUs independently of their AES ID.
4.5.7.3.3.1 When an SU set with the same Q number
and AES ID as an SU set awaiting completion but with a
different reference number is received from the GES, the AES
shall discard the incomplete SU set awaiting completion.
4.5.7.3.3.2 The AES shall discard the received SU set if
the received SU set (complete or incomplete) has the same Q
number, and reference number as the last SU set that has been
completed and reassembled into an LIDU at that Q number.
4.5.7.3.4 If no more SUs corresponding to the SU set
are expected, the AES shall determine whether or not there are
any missing SUs in the received SU set. The AES shall then
do the following:
4.5.7.3.4.1 For DLS:
a) If there are no missing SUs, the AES shall reassemble
the SUs into an LIDU according to 4.5.3.2.4 and pass
the LIDU to the appropriate link service user in the
AES.
b) If there are any missing SUs, the AES shall discard
the incomplete SU set.
4.5.7.3.4.2 For K S :
a) If there are no missing $Us in the SU set, the AES
shall reassemble the SU set into an LIDU according to
subsection 4.5.3.2.4 and forward it to the appropriate
link service user. The AES shall then send a PACK
SU indicating no errors to the GES. If subsequently an
RQA SU requesting acknowledgement for that same
SU set is received, the AES shall command the
selection of an Rchannel frequency and then shall
retransmit that PACK SU.
b) If the number of missing SUs is less than 43, the AES
shall send to the GES one or more PACK SUs comprising
the PACK SU set, identifying the missing SUs
and requesting their retransmission.
Note.- A PACK SU indicating errors can identify as
many as three missing SUs.
c) If more than 42 SUs in an SU set are missing, the
AES shall send to the GES a PACK SU set comprised
of one PACK SU requesting retransmission of the
entire SU set.
4.5.7.3.4.2.1 After sending a PACK SU set requesting
partial or complete retransmission to the GES, the AES shall
then do the following:
a) If an RQA SU is received from the GES within tAl.
seconds (Appendix 4 to Chapter 4) from the time the
PACK SU set wtis transmitted to the GES, the AES
shall command the selection of an R channel
frequency and then shall retransmit the last PACK SU
set to the GES and shall proceed as in 4.5.7.3.4.2.1. If
an RQA SU is received from the GES before the complete
PACK SU set has been transmitted, the AES
shall discard the RQA SU.
b) Upon receipt of SUs headed by an RTX SU or an ISU
from the GES, the AES shall determine whether or not
any more SUs corresponding to the retransmitted SU
set are expected in accordance with the criterion
described in 4.5.7.3.3. The AES shall then determine
whether or not the incomplete SU set identified in the
RTX SU is present in the AES. If the incomplete SU
set is not present in the AES, the AES shall discard
the received SU set headed by RTX SU; otherwise, the
AES shall insert the received SUs headed by RTX SU
into the incomplete SU set. After inserting the received
retransmitted SUs into the incomplete SU set and
discarding any duplicated SUs (as required), the AES
shall determine whether or not the resultant SU set is
complete. The AES then shall do the following:
Annex 10 - Aeronautical Telecommunications Volume ZZZ
1) If the SU set is complete, the AES shall send a
PACK SU indicating no error to the GES. Then
the AES shall reassemble the complete SU set into
an LIDU according to 4.5.3.2.4 and shall pass it to
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