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The associated LICI shall be generated from the control
information in the SUs.
4.6.3.4.3 For an SU set with SU(s) containing no user
data, the resulting LDU shall contain only LICI. The LICI
shall be generated from the control information in the received
SLTs.
4.6.3.5 S~CNAULN IT FORMAT
4.6.3.5.1 The formats for all SUs transmitted on the T
and sub-band C channels shall be as shown in Appendix 2 to
Chapter 4. The signal unit field mapping and the transmission
order of the bits shall be as shown in Figure A2-1. The signal
unit field coding and definitions shall be as described in
Appendix 3 to Chapter 4.
4.6.3.5.2 SUs not recognized by the receiving link layer
shall be ignored.
Note.- SUs nor specifred in Appendix 2 to Chapter 4 may
be in use under mutual upreement between an AMSS service
provider and an AMSS user for non-sufety services.
4.6.4 T channel
transmission protocol
Nore.- In 4.6.4, the use of the terms "AES" and "GES"
refer'ro the link layerfurlctions for the T channel transmission
protocol within the AES and the GES.
The link layer functions for the T channel transmission
protocol shall be as defined in 4.6.4.2 and 4.6.4.3.
4.6.4.2 AIRCRAFETA RTH STATION (AES)
4.6.4.2.1 Upon receiving an LIDU, the AES shall
generate an SU set according to 4.6.3.3.1.
Note.- LlDUs are assigned reference ~zumbers by the T
channel reservation protocol.
4.6.4.2.2 SU transmission. SUs shall be transmitted on
the T channel in burst reservations. Among all the SUs
awaiting transmission, the oldest SU of the SUs with the
highest Q number shall always be transmitted first. The ISU
or the RTX SU of an SU set shall always be transmitted
before the SSUs, and the SSUs shall be transmitted in the
descending order of their sequence numbers (Appendix 3 to
Chapter 4, Item 59). A burst identifier SU (Appendix 2 to
Chapter 4, Figure A2-43) shall be transmitted at the beginning
of each burst (as specified in 4.4.4.3.4). Whenever, during a
burst transmission, there is no SU available for transmission,
a fill-in SLT (Appendix 2 to Chapter 4, Figure A2-42:) shall be
transmitted. However, if no SUs are available at the start of a
burst reservation, the AES shall inhibit the transmission of the
corresponding burst.
4.6.4.2.3 For RLS. For each transmitted SU set the AES
shall do the following:
a) respond to each T channel acknowledgement (TACK)
SU sent by the destination GES via the P channel in
response to the SU set as follows:
1) when the TACK SU (Appendix 2 to Chapter 4,
Figure A2-29) indicates that the SU set has been
completely received at the GES, the AES shall
send a transmission status indication LLDU
indicating success (Table 4-25) to the link service
user:
2) when the TACK SU (Appendix 2 to Chapter 4,
Figure A2-29j indicates that the entire SU Set has
been lost. the AES shall retransmit the entire
original SLT set;
3) when the TACK SU (Appendix 2 to Chapter 4,
Figure A2-29:) indicates missing SUs at the GES,
if no more TACK SUs indicating more missing
SUs of the same SU set are expected, or if one or
more TACK SUs are expected but none is
received within tA5 seconds (Appendix 4 to
Chapter 4) from the time the previous TACK SU
was received, the AES shall retransmit the missing
$Us as indicated in the received TACK SUs. A
ret~ansmission header (RTX) SU (Appendix 2 to
Chapter 4, A2-41) shall be transmitted
before any retransmitted SU. Then, if any further
TACK SU indicating missing SUs associated 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 SLJ set,
Annex 10 - Aeronautical Telecommunications Volume IZI
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 failure to 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
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