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incrernented by one if the T channel is used. The AES
shill then proceed as in 4.6.5.2.6. However, if tA7
seconds elapse after the fifth consecutive transmission of
a REQ SU on the R channel without receiving any
corresponding RES SU or W C SU from the GES, the
AES shall abort the reservation procedure for the
Part Z Annex 10 - Aeronautical Teleconzmunications
corresponding LIDU and shall discard the number of
SUs specified in the last transmitted REQ SU. If an ISU
is amongst the SUs discarded, the AES shall then
discard the complete SU set headed by the discarded
ISU even if this shall result in discarding 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 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
channel burst reservation shall refer to either the current
frame number or one of the 15 frames following the
current frame number.
d) If an RFC SU corresponding to a REQ SU is received
from the GES, the AES shall compute tA8 (Appendix 4
to Chapter 41, 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 infonnation in the RES SU to the T
channel transmission protocol in the AES.
4.6.5.2.7 After the T chamel 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
amve. 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 WC SU associated with the previously received
TACK SU set is received from the GES, the AES shall
update the corresponding tA8 according to the new
delay specified in the l2FC 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 information
in the RES SU to the T channel transmission prMoc01 in
the a s .
Note.- The RFC flag field (Appendix 3 to Chapter 4,
Item 50) in the RES or RFC SU to distinguish between the RES
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
RFC 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 When 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
　
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