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The remaining octets shall be mapped into the 8-octets user
data fields of the SSUs ordered by sequence numbers
(Appendix 3 to Chapter 4, Item 59). The number of SSUs shall
depend upon the number of octets in the LSDTJ. The control
information in each SU of the SU set shall be mapped from the
information contained in the LICI and the information
generated by the internal, link layer protocol processes.
Note.-- In 4.6.4, the use of the terns "AES" and "CES"
refer to the link layerfunctions 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 AIRCRAFTE ARTH STATION (as)
4.6.4.2.1 Upon receiving an LIDU, the AES shall
generate an SU set according to 4.6.3.3.1.
4.6.3.3.2 FOR flDu COMPRISED OF ucl
For an LIDU containing UCJ only, the SU set shall be
generated by mapping the information contained in the LICI
and generated by the internal link layer processes into the
fields of the control infonnation of the appropriate SU.
4.6.3.4 SU SET-TO-mMAuPP ING
4.6.3.4.1 An SU set shall be mapped into an LDU before
being passed to the link service user.
4.6.3.4.2 For an SU set with SU(s) co~ltaining user data,
the resulting LIDU shall contain ESDU and LICI. The LSDU
of the resulting LIDU shall be reassembled by combining the
user data field of each SU of the received complete SU set.
The associated LICI shall be gener~ted 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 LIDU shall, contain only LICI. The LICI
shall be generated from the control information in the received
SUs.
4.6.3.5 SIGNALU NIT 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 Chaptar 4.
4.6.3.5.2 SUs not recognized by the receiving link layer
shall be ignored.
Note.- SUs nnt spec$ed in Appendix 2 to Chapter 4 mqy
be in use under mutual agreement between an AMSS service
provider and an AMSS user for non-safety services.
Note.- LIDUs are assigned reference numbers 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 begjlming of each burst (as specified
in 4.4.4.3.4). Whenever, during a burst transmission, there is
no SU available for transmission, a till-in STJ (Appendix 2 to
Chapter 4, Hgure 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 LIDU indicating
success (Table 4-25) to the link service user;
2) when the TACK SU (Appendix 2 to Chapter 4,
Figure A2-29) indicates that the entire SU set has
been lost, the AES shall retransmit the entire original
SU 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
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No. 75
Part I Annex 10 - Aeronautical TelecommunicatiDns
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
rctransmit the missing SUs as indicated in the
received TACK SUs. A retransmission header (RTX)
SU (Appendix 2 to Chapter 4, Figure A2-41) shall be
transmitted before any retransmitted SU. Then, if any
further TACK SU indicating missing SUs associated
　
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