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SUs received from the destination GES as follows:
1) If the RACK SU (Appendix 2 to Chapter 4, Figure
A2-28) indicates that the SU set has been
completely received at the GES, the AES shall
Annex 10 - Aeronautical Te2ec~rnrnunicaiions
send a transmission status indication UDU
indicating success (Table 4-25) to the link service
user in the AES.
2) If the RACK SU (Appendix 2 to Chapter 4, Figure
A2-29) identifies one or more SUs that have not
been received, the AES shall command the
selection of an R channel frequency and retransmit
the missing SUs in the ascending order of their
sequence indicators. If any other RACK SU
identifying missing SUs is received. the AES shall
discard it if the transmission of all missing SUs
identified in the previously received RACK SU is
not yet completed. However, if either:
bers, reference numbers and sequence indicators (Appendix 3
to Chapter 4, Item 58).
4.5.8.3.2 FOR RLS
4.5.8.3.2.1 After an SC of an SU set has been received
by the GES without completing the set, the GES shall send a
RACK SU identifying the remaining missing SUs to the AES
if any of the following is true:
a) if the received SU is either the last SU of the SU set
or the last SU of the missing SUs of the SU set;
b) if a period of tG4 seconds (Appendix 4 to Chapter 4)
i) in addition to the first RACK SU, five more
RACK SUs identifying missing SUs are
elapses without another SU (DLS or RLS) from the
same AES having been received; or
received before the AES has completelv
transmitted any of the identified missing SUs
in the first RACK SU,
ii) the first RACK SU identified two missing
SUs, and one SU has been hansmitted. and
subsequent to the transmission five more
RACK SUs identifying missing SUs have been
received without transmitting another SU,
then, the AES shall send a transmission status
indication LIDU indicating failure (Table 4-25) to
the link service user in the AES and shall cease
processing that SU set.
c) if the GES subseq~lently receives from the same AES
an SU with a lower Q number or an SU, indicating
DLS, of the same Q number but different reference
number.
If after sending a RACK SU, identifying the missing SUs, the
GES receives no SU in response within tG3 seconds. it shall
retransmit the RACK SU to the AES, excejpt that, instead of
sending the RACK SU, the GES shall discard the.SU set if a
total of 6 identical RACK SUs have been sent and no missing
SU was received within tG3 seconds since the last RACK SU
was transmitted. The GES shall also discard an incomplete SU
-set if an SU indicating RLS and having the same Q number
but different reference number than the SUs of the set, is
Note.- A RACK SU received at the AES would identifi at
received from the same AES.
most two missing SUs from an SU set.
4.5.8.3.2.2 Whenever a complete SU set has been
received, the GES shall reassemble an I D U according to
b, If a RACK SU from the destination GES not 4.5.3.2.4, shall pass it to the appropriate link service user, and
m v e within tA3 seconds (Appendix 4 to Chapter 4)
shall send a RPICK SU indicating no error to the AES.
from the time the last SU in a set (the original SU set
or a retransmitted set of SUs corresponding co the
original SU set) was transmitted, the AES shall com- 4.5.8.3.2.3 After an LIDU has been formed the GES
mand the selection of an R channel frequency from the shall discard all SU sets with the same Q number and referavailable
group of R channel frequencies and shall ence number subsequently received from the same AES until
retransmit the set of SUs. The AES shall repeat this at least one SU with the same Q number and a different referprocess.
unti1 an acknowledgement from the GES is ence number has been received from the same AES, and shall
received, except that the number of times the same set retransmit, for each discarded SU set, a RACK SU indicating
of SUs was retransmitted shall not exceed 5. If a no error to the AES.
KACK SU does not arrive within tA3 seconds after
the fifth repetition, the AES shall send a transmission 4.5.8.3.2.4 Whenever two or more SUs of the same
status indication LIDU indicating failure (Table 4-25) Q number and reference number and sequence indicator have
to the link service user in the AES and shall cease been received from the same AES before the corresponding
processing that SU set. LIDU has been formed, all but one shall be discarded.
4.5.8.3.3 FOR DLS
4.5.8.3 GROUNDEA RTH STATION (GES)
After an SU of an SU set has been received by the GES
4.5.8.3.1 The GES shall associate the SUs received from without completing the set, if any of the following is true, the
　
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