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4.9.3.3.2 and then shall log-on to the selected GES in
accordance with 4.9.3.3.3. If, and when, within the
required time the AES management receives all the
expected LIDUS, it shall transmit a log-on
acknowledgement LDU indicating no errors to the
GES and shall then proceed as given in b).
d) If a log-on reject LIDU is received, the AES management
shall respond according to the rejection reason
(Appendix 3 to Chapter 4, item 44) indicated in the
LIDU.
e) If a log-off request LIDU is received from the GES,
the AES management shall refrain from any attempt to
log-on to this GES for the duration of time specihed
in the LDU, stming at the time of receipt of the
LLDU, except for distresslurgency log-on.
f) If a selective release broadcast LIDU is received from
the GES, the AES shall immediately inhibit any transmission
on the frequency specified in the LIDU.
4.9.3.3.3.2.1 If during the log-on procedure the AES
management receives a P channel loss/degradation indication
(defined in Appendix 1 to Chapter 4), it shall abort the log-on
procedure to the current selected GES, select a GES according
to 4.9.3.3.2 and log on to the selected GES in accordance with
4.9.3.3.3.
4.9.3.3.4 PROCEDUREASF TER LOG-ON
4.9.3.3.4.1 The AES shall attempt to log-~ff before
terminating communication with the log-on GES .
Note.- Lass or degradation of the P channel precludes
any log-off attempt (4-9.3.3.4.4 refers).
4.9.3.3.4.2 The AES management shall respond to the
LIDUs received from its log-on GES as follows:
a) partial sequence of system table broadcast UDUs: the
AES management shall update its system table as
indicated in 4.9.3.2.3;
b) log-on prompt LIDU: the AES management shall
initiate the log-on procedwe (4.9.3.3.3) with the
selected GES being the one specified in the log-on
prompt LIDU;
c) log-on interrogation LIDU: if the AES management
has indicated the capability of responding to a log-on
interrogation LIDU (by setting LOV = 0 in the log-on
request EDU, Table 4-44), it shall respond by sending
a log-on acknowledgement LZDU to the GES;
d) selective release broadcast LIDU: the AES shall
immediately inhibit any transmission on the frequency
specified in the LIDU.
Note.- A selective release brodcasr LZDU may
be sent by a GES to its logged-on AESs at any time.
e) GES channel status report LIDU: the AES management
shall respond by sending an AES channel report
LIDU corresponding to the C channel indicated in the
received LIDU. Any transmit channel EIRP adjustment
indicated in the received LIDU shall be made in
accordance with 4.9.3.4.1.3.2.
f) log controUdata channel reassignment LJDU: the AES
management shall respond with a log controlheady for
reassignment LIDU, then shall do the following:
1) if within tAll seconds (Appendix 4 to Chapter 4)
the AES management does not receive all of the
expected LlDUs (a log-on confirm LTDU and.
Annex 10 - Aeronautical Telecommunications Volume ZII
either a P/R channel control LIDU or a T channel
control LIDU or both), the AES management shall
send a log controVreassignrnent reject LIDU to the
GES;
2) if all the expected LIDUs are received, the AES
management shall command the selection of an R,
channel frequency and then shall send a log-on
acknowledgement LDU to the GES. If the AES
management does not receive a return log-on
acknowledgement LIDU from the GES within
tA12 (Appendix 4 to Chapter 4) seconds from the
time the log-on acknowledgement LlDU was sent
to the GES, it shall command the selection of an
R, channel frequency and then shall retransmit the
same LDU. The AES management shall command
the selection of an % channel frequency and then
shall reneat the retransmission of the same LIDU
every tA12 seconds until a log-on acknowledgement
is received from the GES, except that the
number of transmissions of the log-on acknowledgement
LZDU shall not exceed four. If, after the
fourth transmission, a log-on acknowledgement
LIDU is not received from the GES within tA12
seconds, the AES management shall initiate the
log-on procedure (4.9.3.3.3) with the current logon
GES if an adequate signal level is received on
the log-on GES P,, channel; otherwise, with a
different GES selected according to the GES selection
procedure (4.9.3.3.2). If a log-on acknowledgement
LIDU is received from the GES, the
AES management shall update its log-on confirm
table.
g) log-off request WDU: the fiS management shall
consider the AES logged-off and immediately inhibit
its transmissions on the R and T channels to the GES.
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