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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 a11 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 41, 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
same missing SUs. was sent equals five. If tAl seconds
elapse after the fifth retransmission of the PACK SU set
without receiving any remsrnitted SUs from the GES,
the AES shall discard the incamplete 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 satelliteheam-identifying P,,
channel. The broadcast LIDU 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.
45.8 R channel protocol
Nore.- In 4.5.8, the use of the ferns "AES" and "GES"
refers to the link layer funcrions for the R channel protocol
within the AES and rhe GES.
4.5.8.1 .I 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 LIDU 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 LDU for RLS with the same Q number as the
received LIDU. C p n receipt of an LIDU for DLS, the AES
shall assign an available (not currently assigned to an LJDU
with the same Q number) reference number to it; however, the
AES shall not assign a reference number to LIDUs received
from the circuit-mode services. If a reference number is not
assigned to an LIDU, the LIDU 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 LlDUs of the
same Q number shall not be made with the same reference
number. except for two IDUs which are mapped into DLS
LSU.
Note.- Circ:uit-mode serviws LIDUS Are assigned
application reference numbers by the circuit-mode services.
4.5.8.2.2 For DLS, the reference pumber shall be
released immediately after it is assigned. For RLS, the
-reference number shall be released after the AES sends a
transmission status indication LIDU (Table 4-25) to .the link
service user in the AES. The AES shall not reassign a released
reference number until all the reference numbers that were
available before its release have been assigned; the only
exception to that is for a reference number that was assigned
to a DLS LDU mapping into an LSU, which may be immediate,
ly reassigned to another DLS LIDU mapping into an LSU.
4.5.8.2.3 After the assignment of a reference number to
an LIDU or upon the receipt of a circuit-mode services LIDU,
an SU set shall be generated according to 4.5.3.2.3. Among all
the SUs awaiting transmission. the oldest SU of the SUs with
the highest Q number shall always be transmitted first. The
SUs of an SU set shall be wansmitted in the ascending order
of their sequence indicators (Appendix 3 to Chapter 4,
Item 58).
4.5.8.2.4 ForRLS. For each transmitted SU set, the AES
shall do the following:
a) Respond to the R channel acknowledgement (RACK)
　
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