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link service user in the GES and shall cease processing
that SU set; otherwise, the GES shall proceed as in
4.5.7.2.4.1.
4.5.7.2.4.2 If a PACK SU identifying an SU set which is
not present in the GES is received from an U S ,th e GES shall
discard the received PACK SU.
4.5.7.2.5 If there are no SUs (data or signalling) to be
transmitted, the GES shall transmit an AES system tdble
broadcast SU (Appendix 2 to Chapter 4, Figures A2-30 to
A2-34), if one has been generated from an LDU received
from the GES management; otherwise, the GES shall transmit
a fill-in SU (Appendix 2 to Chapter 4, Figure A2-42).
4.5.7.3 AIRCRAFT EARTH
STATION (MS)
4.5.7.3.1 Upon receipt of an SU set comprised of an LSU,
the AES shall form an LIDU according to 4.5.3.2.4 and pass
it to the appropriate link service user in the AES. For an LSU
using RLS, the AES shall then send a PACK SU indicating no
error to the GES. The AES shall command the selection of an
R channel, frequency and then shall resend that PACK SU if an
RQA SU identifying this SU set is received before another SU
set for this AES with the same Q numkr.
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 completi,on, 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.
Able.- 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 EIDU at that Q number.
4.5.7.3.4 If no more SUs corresponding lo 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 RLS:
a) If there are no missing $Us in the SU set, the AES shall
reassemble the SU set into an LDU 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 thdt same SU set is
received, the AES shall command the selection of an R
channel 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 SWs.
2/11/00
No. 75
Part I Annex 10 - Aeronautical Telecommunicatioss
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 une
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 was 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
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