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GES shall assign one or more burst reservations to the AES
for the SU set identified in the REQ SU. When the GES transmits
a TACK SU set indicating error to the AES, the GES
shall assign one or more burst reservations for retransmission
of the partial SU set comprised of an RTX SU followed by the
missing SUs or re~ansmission of the complete SU set.
hbte.- A TACK SU indicating error contains a Jield
defining the preset delay to the forthcoming. RES SO:
Part Z Annex 10 - Aeronautical Telecommunications
4.6.5.3.2 The GES shall send a RES SU to the AES at
a time such that there is a subsequent maximum delay of 8
seconds before the intended SU set transmission time. If the
start of the assigned resenration is outside the 8-second time
window from the time the reservation was made, the GES
shall send an RFC SU to the AES indicating the delay and
then shall send the RES SU once the actual time is within
8 seconds of the scheduled reservation time. If a reservation
associated with a TACK SU set indicating errors or RFC SU
previously transmitted cannot be made within the delay
specified in the TACK SU set or the RFC SU, the GES shall
send an WC SU to the AES before the delay period has
elapsed. The RFC SU shall indicate a new delay to reservation.
The GES shall send a RES SU to the AES early enough
so that it arrives in time for the AES to 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. The interval between the end of
one reservation and the beginning of the next reservation shall
be sufficient 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 resenfations
for different SU sets shall be such as to allow for the transmission
of at least one R channel burst every 8 seconds. The
T channel burst length shall be chosen to allow the R channel
and T channel transmissions to meet the performance 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 groap 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 AES.
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 GROUNDE ARTH STATION (GES)
4.6.6.2.1 Upon receipt of an LlDU from the circuitmode
link service user (Table 4-38) or the GES management
(Table 4-45), the GES shall generate an SU set from the
LIDU. Each SU set shall comprise either a single signal unit
called a "lone signal unit (LSU)" or more than one signal unit
of which the first shall be an "initial signal unit (ISU)" and
those that follow shall be "subsequent signal units (SSUs)".
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.
4.6.6.2.2 Among all the SUs awaiting transmission, the
oldest of the SUs 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 GES
does not assign a reference number to the LIDU receivedfrarn
the circuir-mode Link service useK lnsread an application
reference number is assigned by the circuit-mode services and
is passed to the link layer in the WCI.
4.6.6.2.3 If there are no SUs to be transmitted, the GES
shall transmit fill-in SUs (Appendix 2 to Chapter 4, Figure
A2-42).
4.6.6.3 ~ R C R A I TEA RTH STATION (AES)
4.6.6.3.1 For an SU set comprised of an LSU, the AES
shall form an LIDU containing only LICI and pass the LIDU
to the appropriate link service user in the AES. The LICI shall
be generated from the control information in the received
LSU.
4.6.6.3.2 For an SU set comprised of multiple SUs, the
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