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more SUs than the number of SUs specified in the
REQ SU. The AES shall then send a transmission
status indication LIDU (Table 4-25) indicating failure
Annex 10 - Aeronautical Telecommunications Volume ZZZ
to the appropriate link service user in the AES corresponding
to that completely discarded SU set. If an
RTX SU is amongst the SUs discarded, the AES shall
discard the complete SU set headed by the RTX SU.
If a REQ SU is amongst the SUs discarded, the AES
shall retransmit the REQ SU again on the R channel
or the T channel in accordance with 4.6.5.2.4.
c) If a RES SU corresponding to a REQ SU is received
from the GES, the AES shall pass the reservation
information in the RES SU to the T channel transmission
protocol. The starting frame number in the
T chamel burst reservation shall refer to either the
current frame number or one of the 15 frames following
the current frame number.
d) If RFC SU corresponding to a REQ SU is received
from the GES, the AES shall compute tA8
(Appendix 4 to Chapter 4), according to the delay
specified in the RFC SU for the expected RES SU to
arrive. The AES then shall do the following:
1) If no RES SU or RFC SU corresponding to that
RFC SU set is received from the GES within tA8
seconds from the time the RFC SU was received,
the AES shall send a REQ SU to the GES on the
T or R channel in accordance with 4.6.5.2.4 with .
the requested length equal to the length associated
with the corresponding RFC SU or incremented by
one if the T channel is used and the AES shall
then proceed as in 4.6.5.2.6.
2) If an RFC SU associated with the previously
received RFC SU is received from the GES, the
AES shall update the corresponding tA8 according
to the new delay specified in the RFC SU.
3) If a RES SU corresponding to that RFC SU is
received from the GES within tA8 seconds from
the time the RFC SU was received, the AES shall
pass the reservation information in the RES SU to
the T channel transmission protocol in the AES.
4.6.5.2.7 After the T channel transmission protocol in
the AES receives a TACK SU set requesting the retransmission
of missing SUs, the AES shall compute tA8, according to
the delay specified in the TACK SU for the expected RES SU
to arrive. The AES then shall do the following:
a) If no RES SU or RFC SU corresponding to that
TACK SU set is received from the GES within tA8
seconds from the time the complete SU set was
received, the AES shall send a REQ SU to the GES on
the T or R channel in accordance with 4.6.5.2.4 with
the requested length equal to the number of missing
SUs identified in the TACK SU set plus on if the
R channel is used or incremented by one more if the
T channel is used and the AES shall then proceed as
in 4.6.5.2.6.
b) If an RFC SU associated with the previously received
TACK SU set is received from the GES, the AES
shall update the co~~espondintgA 8 according to the
new delay specified in the RFC SU.
c) If a RES SU is received from the GES within tA8
seconds from the time the complete TACK SU set was
received, the AES shall pass the reservation infonnation
in the RES SU to the T channel transmission
protocol in the AES.
Note.- The RFC $ag field (Appendix 3 to Chapter 4,
Item 50) in the RES or RFC SU to distinguish between the
E S or RFC SUs associated with REQ SUs and those
associated with TACK SUs or RFC SUs.
4.6.5.2.8 If a RES SU is received from the GES which
does not correspond to any REQ SU sent by the AES or to
W C SU or TACK SU received by the AES, the AES shall
,pass the reservation information in the RES SU to the
T channel transmission protocol.
4.6.5.2.9 If the AES is not able to transmit a T channel
burst in the assigned T channel burst reservation, the AES
shall send a REQ SU to the GES requesting a reservation for
the not transmitted burst.
4.6.5.2.10 Wen an AES terminates communications
with a GES as the result of a handover procedure (4.9), both
the AES and the GES shall release all link layer resources
which were allocated for data communication between them.
4.6.5.2.1 1 The reference number assigned to an LlDU
shall be released when either all the expected reservations
associated with the SU set corresponding to the LLDU have
been received at the AES or the reservation procedure corresponding
to that LDU has been aborted, and after a transmission
status indication LIDU (Table 4-25) indicating success or
failure has been 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
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