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with the same SU set is received before the entire
retransmission SU set has been retransmitted, the
AES shall discard the received TACK SU.
However, the AES shall not transmit the same set, either
the original SU set or a retransmission SU set, more than
three times. If, after the third transmission, the AES
receives a TACK SU that would result in a fourth
transmission of the same SU set, the AES shall send a
transmission status indication LIDU indicating the
f~ilureto the link service user and shall cease processing
that SU set.
b) If an acknowledgement, associated with the SU set, is
not received from the destination GES within tA4A
seconds (Appendix 4 to Chapter 4) from the time the last
SU in the set (either the original SU set or a
retransmission set of SUs corresponding to the original
SU set) was transmitted or, as specified in 4.6.5.2.6 b),
discarded, the AES shall transmit a request for
acknowledgement (RQA) SU (Appendix 2 to Chapter 4,
Figure A2-48). Thereafter, the AES 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
trmsmission status indication LIDU indicating failure
(Table 4-25) to the link service user in the AES and shall
cease processing that SU set.
4.6.4.3 GROUND EARTH STATION (GES)
4.6.4.3.1 The GES shall reassmiate 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 SU has not been received.
Note.- The AES ID associated with a T channel burst
could be determined either from the burst ID SU, if received,
or any other SU, within the same burst, that contains an AES
ID field.
4.6.4.3.2 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 froni 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 with the same AES ID, is reccived.
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 SU 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 accorhng 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 first 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 ID and reference number, until an
SU set with the same Q number, AES ID arid 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 4, 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 expecred,
the GES shall insert the retransmitted SUs into the appropriate
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