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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 braadcast LIDUs: 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 procedure (4.9.3.3.3) with the selected GES
being the one specified in the log-on prompt LDU;
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 LIDU, Table 4-44), it shall respond by sending
a log-on acknowledgement LIDU to the GES;
d) selective release broadcast WDU: the AES management
shall immediately inhibit any transmission on the
frequency specified in the LIDU.
Note.- A selective release broadcast LIDU m y be
sen,t 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 charnel indicated in the received
LIDU. Any transmit channel EIRP adjustment indicated
in the received LLDU shall be made in accordance with
4.9.3.4.1.3.2.
f) log controlfdata channel reassignment UDU: the AES
managemenr shall respond with a log control/ready for
reassignment LIDU, then shall do the following:
21~1/00
No. 75
Annex 10 - Aeronautical Telecommunications Volume III
1) if within tAll seconds (Appendix 4 to Chapter 4) the
AES management does not receive all of the
expected LDUs (a log-on confirm LIDU and, either
a P/R channel control LIDU or a T channel control
LIDU or both), the AES management shall send a
log cotitrol/reassignment reject LIDU to the GES;
2) if all the expected LDUs are received, the AES
management shall command the selection of an Rd
channel frequency and then shall send a log-on
acknowledgement LlDU to the GES. If the AES
management does not receive a return log-on
acknowledgement LDU from the GES within tA12
(Appendix 4 to Chapter 4) seconds from the time the
log-on acknowledgement LIDU was sent to the GES,
it shall command the selection of an & channel
frequency and then shall retransmit the same LIDU.
The AES management shall command the selection
of an Rd channel frequency and then shall repeat 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 LDU 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 log-on 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 AES management shall
consider the AES logged-off and immediately inhibit its
transmissions on the R and T channels to the GES. The
GES shall be considered as "temporarily unavailable"
(see Appendix 3 to Chapter 4, Item 44).
was transmitted, the AES management shall
retransmit another log-off request LIDU. The AES
management shall retransmit the same LDU evcly
tAlO seconds until a log-off acknowledgement LIDU
from the GES is received, except that the number of
transmissions of the log-off request LIDU shall not
exceed five. If, within CAlO seconds from the time of
the fifth rransmission, a log-off acknowledgement
LIDU is not received, the AES management shall
consider the AES logged off;
2) when a log-off acknowledgement LIDU is received
from the log-on GES, the AES management shall
consider the MS logged off;
b) GES-to-GES handover command: the AES management
shall log on to the specified GES within the same
satellite service area as the current log-on GES using the
procedure in 4.9.3.3.3. However, for a Level-3 AES, if
the AES transmit channel unit is being used for a
circuit-mode call, the AES management shall initiate the
log-on procedure after the circuit-mode call is
terminated;
c) satellite-to-satellite handover command.- the AES
management shall first maintain all previously
established circuit-mode calls for three minutes or until
all calls are cleared, whichever comes first. After three
minutes, the AES management shall clear any remaining
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