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without transmitting another SU, was transmitted. The GES shall also discard an incomplete
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No. 75
Part I Annex 10 - Aeronautical Telecommunications
SU set jf an SU indicating =S and having the same Q number
but different reference number than the SUs of the set, is
received from the same AES.
4.5.8.3.2.2 Whenever a complete SU set has been
received, the GES shdl reassemble an LIDU according to
4.5.3.2.4, shall pass it to the appropriate link service user, and
shall-send a RACK SU indicating no error to the AES.
4.5.8.3.2.3 After an LIDU has been formed the GES shall
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 (LICI) and link
service data unit (LSDU), except that the transmission status
indication LIDU (Table 4-25) passed by the link layer to the
subnetwork layer at the transmitting end shall contain only
LICI.
discard number aslul bSsUeq useentstl yw irtehc etihvee ds afmroem Q t hneu msabmere aAnEd Sr eufenrteiln caet 4.6.2.2 The LDU exchanged between the link layer and
circuit -made between the layer md ms, least one SU with the same Q number and a different reference number has been received from the same AES, and shall GES management functions for transmission on the sub-band
retransmit, for each discarded SU set, a RACK SU indicating C channel shall contain LICI only.
no error to the AES.
4.5.8.3.2.4 Whenever two or more SUs of the same Q
number and reference number and sequence indicator have 4.6.2.3 LINK INTERFACE CONTROL
been received from the same AES before the corresponding INFoRMATroN (LICI)
LIDU has been formed, all but one shall be discarded.
4.6.2.3.1 The LICI parameters exchanged between the
link layer and the subnetwork layer shall be as defined in
4.5.8.3.3 FORD LS Table 4-25.
After an SU of an SU set has been received by the GES 4.6.2.3.2 The LICI parameters exchanged between the
without completing the set, if any of the following is true, the link 1,ayer and circuit-mode services shall be as defined in
GES shall discard the received SUs: Table 4-38. The WCI parameters exchanged between the link
layer and subnetwork management functions shall be as
a) if the received SU is the last SU in the set; defined in Tables 4-44 and 4-45.
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 4.6.2.4 LINK SERVICE DATA UNIT (LSDU)
c) if the GES subsequently receives from the same AES an
SU with a lower Q number or an SU of the same Q The link service data unit (LSDU) shall contain link service
number but different reference number. user data and shall be extracted from the LIDU received from
the subnetwork layer.
If and when the SU set becomes complere, 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 4.6.3 Signal unit (SU)
GES shall send the SU set to the GES whose D is specified.
4.6.3.1 There shall be two lengths of SUs for the T
channel and one length for the sub-band C channel:
4.6 LINK LAYER T CHANNEL AND SUB-BAND
C CHANNEL PROTOCOLS
4.6.1 General
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.
4.6.1.1 The link layer functions for T and sub-band C
channels to transfer user data and signalling shall be as defined 4.6.3.2 Each SU of the SU set corresponding to an LIDU
in this section. received from the satellite subnetwork layer shall contain
control information and user data. The SUs of the SU set
4.6.1.2 The P and R channels, described in 4.5, shall bc corresponding to an LTDU received from the circuit-mode
used to set up T and sub-band C channels as described in 4.6.5 services and AESIGES mmagement shall contain only control
and 4.6.6, respectively. information.
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Annex 10 - Aeronautical Telecommunications
4.6.3.3 LmU-TO-SIJ SET MAPPING 4.6.4 T channel
transmission' protocol
4.6.3.3.1 FoR WDU COMPRISED OF LSDU AND LlCI
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). 7he first
two octets of the LSDU shall be mapped into the 2-octet user
data field of the ISU (Appendix 2 to Chapter 4, Figure A2-37).
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