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were allocated for data communication between them.
4.6.5.2.11 The reference number assigned to an LIDU
shall be released when either all the expected reservations
associated with the SU set corresponding to the LIDU have
been received at the AES or the reservation procedure
corresponding to that LIDU has been aborted, and after a
transmission status indication LIDU (Table 4-25) indicating
success or failure has h e n sent to the link service user in the
AES.
4.6.5.3 GROUNDE ARTH STATION (GES)
4.6.5.3.1 Upon receipt of a REQ SU from the AES, the
GES shall assign one or. more burst reservations to the AES for
the SU set identified in he REQ SU. When the GES transmits
a TACK SU set indicating error to the AES, the GES shall
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Annex 10 - Aeronautical Telec~mmunicatiorts Volume 111
assign one or mote burst reservations for retransmission cf the
partial SU set comprised of an RTX SU followed by the
missing SUs or rettansnlission of the complete SU set.
Nore.- A TACK SU indicating error contains a fSeld
defining the preset delay to the forthcoming RES SU.
4.6.5.3.2 The GES shall send a RES SU to the AES at a
time such that there is a subsequent niaximum delay of 8
seconds before the intended SU set transmission time. If the
start of the assigned reservation is outside the 8-second time
window from the time the reservation was made, the GES shall
send an RFC SU LO the M,S indicating the delay and then shall
send the RES SU once the actual time is within 8 seconds of
he scheduled reservatioa time. 11 a reservation associated with
a TACK SU set indicating errors or RFC SU previously
transmitted canno1 be made w i t h the delay specified in the
TACK SU set or the W C SU, the GES shall send an WC SU
to the AES before the delay pcdod has elapsed. The RFC SU
shall indicate a new delay to reservation. 'rhc GES shall send
a lRES SU to the AES early enough sc that it arrives in time
for the AES lo begin sending an SU set at the start of burst
reservation.
4.6.5.3.3 The GES shall not assign overlapping
reservations on the same T channel. 'lhe interval between the
end of one reservation and tl~e beginning of the next
reservation shall be snfficient to assure that the T channel
bursts reserved by the GES do not overlap. A long SU set shall
be assigned multiple bursts separated by intervals. The interval
between the multiple burst reservations or between individual
reservations for different SU sets shall be such as to allow for
the transmission of at least one R chal~nel burst every 8
seconds. The T channel burst length shall be chosen to allow
the R channel and T channel transmissions to meet the
pe'rforrnance requirements in 4.7. The length of each burst
reservation shall be sufficient to accommodate the burst
identifier SU which heads each T channel burst and the total
reservation length shall be at least one SU longer than the
requested one. The GES shall make reservations such that any
given AES shall not be required to transmit at any time on
more than one T channel belonging to the group of T channels
assigned to the AES.
4.6.6 Sub-band C channel
to-aircraft protocol
Note.- In this subsection, the use of the terms "AES" and
"GES" refers to the link layer functions for the sub-band C
channel to-aircraft protocol within the GES and the M S .
The link layer functions for an individual sub-band C channel
in the to-aircraft direction shall be as specified in 4.6.6.2 and
4.6.6.3.
4.6.6.2 GROUND EARTH STATION (GES)
4.6.6.2.1 Upon receipt of an LIDU from the circuit-mode
link service user (Table 4-38) or the GES management (Table
4-45), the GES shall generate an SU set from the LDU. Each
SU set shall comprise either a single signal unit called a "lcne
signal unit (LSU)" or more than one signal unit of which the
first shall be an "initial signal unit (1SU)" and those that follow
shall be "subsequent signal units (SSUs)". Tile 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.
4.6.6.2.2 Among all the SUs awaiting transmission, the
oldest of the STJs with the highest Q number shall always be
transmitted first. The SUs of an SU set comprised of multiple
SUs shall be transmitted in the descending order of their
sequence numbers (Appendix 3 to Chapter 4, Item 59).
Note.- The sub-band C channel link layer in the EES does
not assign a reference number to the LIDU receivedfiom the
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