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logged-on AESs into sets according to their AES IDS, Q num- GES shall discard the received SUs:
Annex 10 - Aeronautical Telecommunications Volume III
a) if the received SU is the last SU in the set;
b) if a period of tG4 seconds (Appendix 4 to Chapter 4)
elapses without another SU (DLS or RLS) 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 of the same
Q number but different reference number.
If and when the SU set becomes complete,'the GES shall
reassemble the set into an LIDU according to 4.5.3.2.4 and
shall pass it to the appropriate link service user. However, if
the SUs of the complete SU set specify a different GES ID
and the SU set corresponds to a circuit-mode services LIDU,
the GES shall send the SU set to the GES whose XD is
specified.
4.6 LINK LAYER T CHANNEL AND SUB-BAND
C CHANNEL PROTOCOLS
4.6.1 General
4.6.1.1 The link layer functions for T and sub-band C
channels to transfer user data and signalling shall be as defined
in this section.
4.6.1.2 The P and R channels, described in 4.5, shall be
used to set up T and sub-band C channels as described in
4.6.5 and 4.6.6, respectively.
4.6.2.3.2 The LICI parameters exchanged between the
link layer and circuit-mode services shall be as defined in
Table 4-38. The LICI parameters exchanged between the link
layer and subnetwork management fhnctions shall be as
defined in Tables 4-44 and 4-45.
4.6.2.4 LINK SERVICE DATA UNIT (LSDU)
The link service data unit (LSDU) shall contain link service
user data and shall be extracted from the LIDU received from
the subnetwork layer.
4.6.3 Signal 'unit (SU)
4.6.3.1 There shall be two lengths of SUs for the
T channel. and one length for the sub-band C channel:
a) 48 bits (6 octets): burst identifier lone signal unit
(LSU) (Appendix 2 to Chapter 4, Figure A2-43) for
T channel.
b) 96 bits (12 octets): standard length SUs for T and
sub-band C channels.
4.6.3.2 Each SU of the SU set corresponding to an
EIDU received from the satellite subnetwork layer shall
contain control information and user data. The SUs of the SU
set corresponding to an LIDU received from the circuit-mode
services and AESIGES management shall contain only control
information.
4.6.3.3 LDU-TO-SU SET MAPPING
4.6.2 Link interface data unit (LIDU)
4.6.2.1 The LIDU exchanged between the link layer and
the subnetwork layer for transmission on the T channel. shall
contain link interface control information (EICI) and link
service data unit (LSDU), except that the transmission status
indication LIDLT (Table 4-25) passed by the link layer to the
subnetwork layer at the transmitting end shall contain only
LICI:
4.6.2.2 The LIDU exchanged between the link layer and
circuit-mode services and between the link layer and
AESIGES management functions for transmission on the subband
C channel shall contain LICl only.
4.6.3.3.1 FOR LfDI/ COMPRISED OF
UDU AND LICI
An LIDU shall be mapped into an SU set. Each SU set shall
comprise an "initial signal unit" (ISU) followed by a
maximum of 63 "subsequent signal units" (SSUs). The first
two octets of the LSDU shall be mapped into the Zoctet user
data field of the ISU (Appendix 2 to Chapter 4, Figure
A2-37). The remaining octets shall be mapped into the &-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 LSDU. 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.
4.6.2.3 LINK INTERFACE CONTROL
INFORMATION (LICI)
4.6.3.3.2 FOR LID.!! COMPKISED OF Llcl
4.6.2.3.1 The LICI parameters exchanged between the
link layer and the subnetwork layer shall be as defined in
Table 4-25.
Fox an LIDU containing LICI only, the SU set shall be
generated by mapping the information contained in the LICI
Part I Annex I0 - Aeronautical TeEecomrnunications
and generated by the internal link layer processes into the
fields of the control information of the appropriate SU.
4.6.3.4 SU SET-TO-LIDU MAPPING
4.6.3.4.1 An SU set shall be mapped into an LIDU
before being passed to the link service user.
4.4.3.4.2 For an SU set with SU(s) containing user data,
the resulting LIDU shall contain LSDU 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.
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