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most current version of the system table. The currency of the
system table shall be determined by comparing the revision
number (Appendix 3 to Chapter 4, Item 49) of the system
table currently held at the AES with the revision number of
the system table broadcast received on the satelliteheamidentifying
P,,, channel. If necessary, the system table shall be
updated in accordance with 4.9.3.2.3.
4.9.3.3.3 I!.OG-ON PROCEDURE
4.9.3.3.3.1 Initiation of a log-on procedure with the
selected GES shall be either automatic or in response to a
received command. The AES management shall initiate the
log-on procedure immediately following the selection of a
log-on GES.
4.9.3.3.3.2 To log on to the selected GES, the AES
management shall transmit a log-on request LIDU to the GES
on an q,, channel frequency randomly selected from the GES
R,,, channel frequencies given in the system table. The log-on
request LIDU shall indicate a distress condition (by setting "Q
number of application" = 15 in the log-on request LIDU,
Table 4-44), if such a condition is declared at the aircraft. The
AES management shall then do the following:
a) If tAll seconds (Appendix 4 to Chapter 4) elapses
without receiving a response from the GES as
specified in b) to e) below, the AES management shall
command the selection of an q,, channel frequency
and then retransmit the log-on request LIDU to the
selected GES. The AES management shall command
the selection of an q,, channel frequency and then
retransmit the log-on request LIDU every tAll
seconds until a response is received, except that the
number of transmissions of the log-on request LlDU
shall not exceed 5. If, after the fifth transmission, a
response is not received within tAl 1 seconds, the AES
management shall abort the log-on procedure to the
current selected GES, select a GES according to
4.9.3.3.2 and then shall log-on to the selected GES in
accordance with 4.9.3.3.3.
b) If within tAl 1 seconds the AES management receives
a log-on confirm LIDU, and the channel control
LIDUs (P/R and T channel control LIDUs) indicated
in the log-on confirm LDU, the AES management
shall command the selection of an R, channel frequency
and then shall transmit a log-on acknowledgement
LIDU indicating the correct receipt of all
expected LIDUs to the GES. If, after tA12 seconds
from sending a log-on acknowledgement LIDU, the
AES management does not receive a log-on acknowledgement
LIDU from the GES on the assigned P,
channel, it shall command the selection of an R,
Annex 10 - Aeronautical Telecommunications
channel frequency and then shall retransmit the log-on
acknowledgement LIDU. The AES management shall
command the selection of an R,, channel frequency and
then shall retransmit the same LIDU every tA12
seconds until a log-on acknowledgement LIDU is
received from the GES, except that the total number of
transmissions of the log-on acknowledgement LIDU
shall not exceed four. If, after a 1 2 seconds from the
fourth transmission, a log-on acknowledgement LIDU
is not yet received from the GES, the AES management
shall abr? the log-on procedure to the current
selected GES, select a GES according to 4.9.3.3.2 and
then shall log-on to the selected GES in accordance
with 4.9.3.3.3; otherwise, when a log-on acknowledgement
LIDU is received, the AES shall be
considered logged on. The AES management shall
then relay this information on the various interfaces,
where applicable, and update its log-on confirm table.
C) If some, but not all, of the expected LIDUs are
received within tAl 1 seconds, the AES management
shall transmit a log-on acknowledgement LLDU to the
GES indicating the missing LIDUs. If, after tAll
seconds from the time the AES log-on acknowledgement
LIDU was transmitted, the AES management
still has not received all expected LIDUs, it shall
command the selection of an R,,, channel frequency
and then retransmit another log-on acknowledgement
LIDU indicating all missing LIDUs to the same GES.
The AES management shall command the selection of
an R,, channel frequency and then shall repeat the
transmission of a log-on acknowledgement LIDU, indicating
all missing LIDUs, every tA 1 1 seconds until all
expected LIDUs are received, except that the total
number of transmitted log-on request LIDUs (in aj
above) and log-on acknowledgement LIDUs shall not
exceed five. If, after tAll seconds from the fifth transmission,
all expected LIDUs have not been received,
the AES management shall abort the log-on procedure
to the current selected GES, select a GES according to
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