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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 shaIl
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:
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 the
appropriate link service user in the AES. If
subsequently, an RQA SU requesting acknowledgement
for that same SU set is received
before another SU set for this AES with the same Q
number, the AES shall command the selection of an
R channel frequency and then shall retransmit that
PACK SU.
2) If the SU set is not complete, the AES shall send to
the GES one or more PACK SUs comprising a PACK
SU set, in accordance with 4.5.7.3.4.2 b) and c). The
AES shall then proceed as in 4.5.7.3.4.2.1.
c) If no response is received from the GES within tAl
seconds (Appendix 4 to Chapter 4) from the time the
complete PACK SU set requesting retransmissions was
sent, the AES shall command the selection of an R
channel frequency and then shall send the PACK SU set
again to the GES identifying the missing SUs. The AES
shall retransmit the PACK SU set every tAl seconds
(Appendix 4 to Chapter 4), from the time the last PACK
SU set was sent, until a corresponding retransmitted SU
set is received from the GES, or until the number of
times the PACK SU set, identifying the sanle missing
SUs, was sent equals five. If tAl seconds elapse after the
fifth retransmission of the PACK SU set without
receiving any retransmitted SUs from the GES, the AES
shall discard the incomplete SU set.
4.5.7.3.5 The AES shall respond to a request for
acknowledgement (RQA) SU received from the GES by
sending a PACK SU requesting the retransmission of the entire
SU set if the RQA SU identifies an SU set not received at the
AES.
4.5.7.3.6 The AES link layer shall pass the revision
number of the system table broadcast to the AES management
upon receipt of the first SU of a system table broadcast
sequence received on the satellitelbeam-identifying P,,,
channel. The broadcast LDU corresponding to a series of a
complete or partial broadcast sequence (see 4.10.4.5.2.2) shall
be assembled and passed to the AES management after all the
expected SUs of the series have been received, or after an SU
of another series with a revision number equal to or greater
than the series awaiting completion is received.
4.5.8 R channel protocol
Note.- In 4.5.8, the use of the t e r n "AES" and "GES"
refers to the link layer functions for the R channel protocol
within the AES and the GES.
4.5.8.1.1 The link layer functions associated with the R
channel protocol shall be as defined in 4.5.8.2 and 4.5.8.3.
4.5.8.2 AIRCRAFTEA RTH STATION (AES)
4.5.8.2.1 Upon receipt of an LlDU for RLS, the AES
shall assign a reference number (Appendix 3 to Chapter 4,
Item 46) to it if there is no reference number currently
assigned to an 'LIDU for RLS with the same Q number as the
received LIDU. Upon receipt of an LIDU for DLS, the AES
shall assign an available (not currently assigned to an LIDU
with the same Q number) reference number to it; however, the
AES sha!l -not assign a reference number to LIDUs recejved
from the circuit-mode services. If a reference number is not
assigned to an LIDU, the LZDU shall be stored until one is
assigned to it. Each assignment of a reference number shall be
to the oldest received LIDU without a reference number. TWO
consecutive reference number assignments for LDUs of the
same Q number shall not be made with the same reference
number, except for two LIDUs which are mapped into DLS
LSU.
21 281 UDO
No. 7s
Annex 10 - Aeronautical Telecommunicntions Vohrne 111
Note.- Circuit-mode services LIDUs are assign,ed
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