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shall command the selection of an R channel
frequency and then shall retransmit the RQA SU
every tA4B seconds (Appendix 4 to Chapter 4) from
the time the previous RQA SU was transmitted, until
a corresponding TACK SU is received. However. if
a corresponding TACK SU is not received within
tA4B seconds from the time the fifth RQA SU was
transmitted. the AES shall send a transmission status
indication LIDU indicating failure (Table 4-25) to the
link service user in the A U and shall cease processing
that SU set.
4.6.4.3 GROUNDEA RTH STATION (GES)
4.6.4.3.1 The GES shall reassociate and reorder the SUs
received from a logged-on AES according to their AES IDS,
Q numbers, reference numbers and sequence numbers, defined
in Appendix 3 to Chapter 4. A received SSU shall be
discarded if the corresponding ISU or RTX SC has not been
received.
Note.- The AES ID associated with a T channel burst
could be determined either from the bursr ID SU, if received,
or any other SU, within the same bursr, thut contains an AES
ID $field.
1.6.4.3.2 Following the receipt of an ISU, the GES shall
determine whether or not any more SSUs corresponding to the
SU set headed by the received ISU are expected from the AES
according to the following criterion:
No more SSUs corresponding to the SU set are expected
if either the last SSU of the set, or an SU from the same
AES but with a lower Q number, or an SU from the same
AES with the same Q number but with a different
reference number, or a fill-in SU w~thth e same AES ID,
is received.
4.6.4.3.3 When no more SUs corresponding to an SU set
are expected, the GES shall determine whether or not there are
any missing SUs in the received SU set. The GES then shall
do the following:
a) if the SLT set is complete, send a T channel acknowledgement
(TACK) SU (Appendix 2 to Chapter 4.
Figure A2-29) indicating that no SUs are missing,
assemble an LIDU from the SU set according to
4.6.3.4, and pass it to the appropriate link service user;
b) if the SU set is incomplete, transmit one or more
TACK SUs identifying the missing SUs to the AES,
according to the following:
1) if more than 42 or less than 4 SUs of the SU set
are missing, only one TACK SU (Appendix 2 to
Chapter 4, Figure A2-29) shall be sent. In the fi~st
case the TACK SU shall indicate a request for the
retransmission of the entire SU set, while in the
second case it shall indicate a request for
retransmission of all missing SUs;
2) otherwise, a maximum of 14 TACK SUs (Appendix
2 to Chapter 4, Figure A2-29) indicating all
missing SUs shall be sent to the AES.
4.6.4.3.3.1 If the received SU set is a retransmission of
an SU set awaiting completion at the GES, the GES shall use
these sets to form a new SU set that is as complete as possible
prior to sending an acknowledgement as given in 4.6.4.3.3 a)
and b),
4.6.4.3.3.2 For each completed SU set, the GES shall
discard all subsequent SU sets (complete or incomplete) with
the same Q number, AES W and reference number, until an
SU set with the same Q number. AES 1D and the paired
reference number (according to the pairing scheme given in
4.6.5.2.2) is received.
4.6.4.3.4 Following the reception of an RTX SU
(Appendix 2 to Chapter I, Figure A2-41): the GES shall determine.
according to the criterion described in 4.6.4.3.2, whether
or not any more SUs corresponding to the retransmission set,
headed by the received RTX SU, are expected from the AES.
When no more SUs are still expected, the GES shall insert the
retransmitted SUs into the appropriate (incomplete) SU set and
shall acknowledge as specified in 4.6.4.3.3.
4.6.4.3.5 The GES shall respond to a request for
acknowledgement (RQA) SU received from the AES by
retransmitting the latest previously sent set of TACK SUs
corresponding lo the SU set indicated in the RQA SL..If the
RQA SLT identifies an SU set awaiting completion at the GES
and for which no TACK SU has been transmitted, the GES
shall send a TACK SU requesting the retransmissions of the
missing SUs. If the RQA SU identifies an SU set not received
at the GES, the GES shall send a TACK SU requesting the
retransmission of the entire SU set.
Part Z Annex JO - Aeronautical Telecommunications
4.6.4.3.6 If the GES receives an ISU with the same AES
ID and Q number as those of an SU set awaiting completion
and with a reference number equal to the reference number
paired with the reference number of the SU set according to
the pairing scheme given in 4.6.5.2.2, the GES shall discard
the awaiting SU set.
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