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application reference numbers by the circuit-mode services.
4.5.8.2.2 For DLS, the reference number shall be released
immediately afler it is assigned. For RLS, the reference
number shall be released after h e AES sends a transmission
status indication LDU (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
LIDU mapping into an LSU, which may be immediately
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 transmitted in the ascending
order of their sequence indicators (Appendix 3 to Chapter 4,
Item 58).
4.5.8.2.4 For RLS. For each transmitted SU set, the AES
shall do the following:
then, the AES shall send a transmission status
indication LDU indicating failure (Table 4-25) to the
link service user in the AES and shall cease
processing that SU set.
Note.- A RACK SU received at the AES would identzfy at
most two missing $Us from an SU set.
b) If a RACK SU from the destination GES does not arrive
within tA3 seconds (Appendix 4 to Chapter 4) from the
time the last SU in a set (the original SU set or a
retransmitted set of SUs corresponding to the origillal
SU set) was transmitted, the AES shall command the
selection of an R channel frequency from the available
group of R channel frequencies and shall retransmit the
set of SUs. The AES shall repeat this process until an
acknowledgement from the GES is received, except that
the number of times the same set of SUs was
retransmitted shall not exceed 5. If a RACK SU does not
arrive within tA3 seconds after the fifth repetition, 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.
4.5.8.3 GROUND EARTH STATION (GES)
a) Respond to the R channel acknowledgement (RACK)
SUs received from the destination GES as follows: 4.5.8.3.1 The GES shall associate the SUs received from
logged-on LESS into sets according to their AES Ds, Q
If the RACK SU to 4, Figure numbers, reference numbea and sequence indic~ors
A2-28) indicates that the SU set has been completely (ApFndir to Chapter 4, 58).
received at the GES, the AES shall send a
transmission status indication LIDU indicating
success (Table 4-25) to the link service user in the
M S . 4.5.8.3.2 FOR RLS
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:
i) in addition to Lhe first MCK SU, five more
RACK SUs identifying missing SUs are received
before the AES has completely transmitted any of
the identified missing §Us in the first RACK SU,
4.5.8.3.2.1 After an SU 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)
elapses without another SU (DLS or K S ) from the
same AES having been received; or
c) if the GES subsequently 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.
or If after sending a RACK SU, identifying the missing SUs, the
GES receives no SU in response within tG3 seconds, it shall
ii) the first RACK SU identified two missing SUs, retransmit the RACK SU to the AES, except that, instead of
and one SU has been transmitted, and subsequent sending the RACK SU, the GES shall discard the SU set if a
to the transmission five more RACK SUs total of 6 identical RACK SUs have been sent and no missing
identifying missing SUs have been received SU was received within tG3 seconds since the last RACK SU
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