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LSDU of length greater than 4 octets, the first two octets of the
LSDU shall be mapped into the Zoctet user data field of an
ISU (Appendix 2 to Chapter 4, Figure A2-37). The remaining
octets shall be mapped into the 8-octet user data fields of
subsequent SSUs (Appendix 2 to Chapter 4, Figure A2-38)
ordered by sequence numbers (Appendix 3 to Chapter 4,
Item 59). The number of SSUs shall depend upon the number
of octets in the LSDU. The control information in each SU of
the SU set shall be mapped from he information contained in
the LICI and the information generated by the internal link
layer protocol processes.
Note.- Each ISU contains information indicating the
number of octets in the user data $eld of the last SSU of the
SU set.
4.5.3.2.3.2.2 For the R channel, an LSDU shall map into
a maximum of 3 extended length SUs, with the ISU of the SU
set containing the first 1 ],-octets (Appendix 2 to Chapter 4,
Figure A2-44) of the LSDU in jts user data field. The
remaining octets shall be mapped into the 11-octet user data
field of SSUs ordered by sequence indicator (Appendix 3 to
Chapter 4, Item 58). 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.
4.5.3.2.3.3 For LIDU comprised of
LJCI only
For an LDU containing LICI only, the SU set shall be
generated by mapping the information contained in the LICI
and generated by the internal link layer protocol processes into
the fields of the control information of the appropriate SU.
4.5.3.2.4 S u S E T - T O - ~MDAP~PIN G
4.5.3.2.4.1 At the receiving end, an SU set shall be
reassembled into an LDU before being passed to the link
service user.
4.5.3.2.4.2 For an SU set with SU(s) containing user data,
the resulting LDU shall contain LSDU and LICI. The LSDU
shall be reassembled by combining the user data field of each
SU of the received complete SU set. The LICI shall be
generated from the control information in the SUs.
4.5.3.2.4.3 For an SU set with SU(s) containing no user
data, the resulting LIDU shall contain only LICI. The LZCI
shall be generated from the control information in the received
SUs.
4.5.3.3 SIGNALU NIT FORMAT
4.5.3.3.1 The formats of all SUs transmitted on the P and
the R 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-I. The signal unit field
coding and definitions shall be as described in Appendix 3 to
Chapter 4.
4.5.3.3.2 SUs not recognized by the receiving link layer
shall be ignored.
Note.-- SUs not specified in Appendix 2 to Chupter 4 may
be in use under mutual agreement between an AMSS service
provider and an AMSS user for non-safety services.
4.5.4 LIDU routing
The receiving link layer (in either the GES or the AES) shall
use the message type parameter in the LICI to route the LDU
to the appropriate link service user. The transmitting link layer
(in the GES and the AES) shall use the routing parameter in
the LICI received from the circuit-mode services (Table 4-38)
to route the SU set corresponding to an LIDU, for transmission
on the sub-band C channel or the RIP channels.
2/11/00
No. 75
Part I Annex I0 - Aeronautical Telecommunicu~ns
4.5.5 Precedence (Q numberj
Each SU of the SU set generated from an LIDU shall be
assigned a precedence (Q number) by the link layer according
to the precedence parameter passed to it in the LICI by the link
service user. Each link layer signalling SU shall be assigned a
Q number according to its message type. A Q number shall be
in the range from 0 (lowest precedence) to 15 (highest
precedence).
4.5.6 DLS and F&S services
4.5.7.2.2 At any Q precedence level, each assignment of
a reference number to an LDU dcstined to a particular AES
shall be to the oldest LIDU among all the LIDUs without a
reference number at that Q level destined to this AES. The
GES shall not assign a reference number to an LIDU if
there is a reference number currently assigned to another
LIDU with the same Q number and addressed to the same
AES. Wo consecutive reference number assignments for
LIDUs of the same Q number shall not be made with the same
reference number except for two DLS LIDUs which are
mapped into LSUs. In the case of RLS, the reference number
assigned by the GES shall not be equal to the last assigned
reference number to an RLS LIDU with the same Q number
and addressed to the same AES.
4.5.6.1 The link layer shall provide two distinct types of 4.5.7.2.3 For DLS, the reference number shall be released
　
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