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shall update its AES log-on status table as specified
in 4.10.4.2.3, and send log-on information to
the other GESs in the same satellite service area.
c) IF a log-on acknowledgement LIDU identifying the
missing LIDUs is received from the AES, the GES
management shall retransmit the missing LIDUs to the
AES and shall proceed as in 4.10.4.3.2.3.
4.10.4.3.2.4 If another log-on request LIDU is received
from the AES before the GES management has finished
responding to the previously received log-on request LIDU,
the GES management shall discard the last received log-on
request LDU.
Note.- An AES log-ofS m y be initiated by the AES by
sending a log-off~quesLtI DU to the GES or by the GES by
sending a log-off requesi WDU to the AES. The GES initiated
log-of is intended to provide the GES with the capability to
shut down undesired AES transmissions.
4.10.4.3.3.1 Upon receipt of a log-off request LIDU
from an AES, the GES management shall do the following:
a) if the AES is identified as logged on to this GES in
the AES log-on status table, delete the AES fmm its
AES log-on status table, transmit log-off information
to other GESs in the same satellite service area and
then transmit log-off acknowledgement LIDU to the
AES; or
b) if the AES is not identified as logged-on to this GES
in the AES log-on status table but is in the process of
logging on, transmit log-off acknowledgement LIDU
to the AES.
4.10.4.3.3.2 After sending a log-off request LIDU to an
AES, the GES management shall not be required to respond
to any transmission from the identified AES for the duration
of the time specified in the LIDU, except, as specified in
4.10.4.3.2.1, to a log-on request LIDU indicating that the AES
is in distress.
AES within tC;6 seconds (Appendix 4 to Chapter 4) from the time
the activity indicator was lust set to "active".
4.10.4.3.4.1 The GES management shall verify the AES
activity status by either of the following two methods:
a) direct verification; or
b) indirect verification.
Note.- The log-on verification of the AES is the
responsibility of its log-on GES only.
4.10.4.3.4.2 Direct ver$cation
If no datalsignalling is received at the log-on GES or at
another GES in the same satellite service area as the log-on
GES from an AES capable of responding to log-on interrogation
LIDU within tG6 seconds (Appendix 4 to Chapter 4) from
the time the activity indicator for the AES was last set to
inactive, the GES management shall send a log-on interrogation
LlDU to the AES. The GES management shall then do
the following:
a) K no log-on acknowledgement LIDU is received from
the AES within tG8 seconds (Appendix 4 to
Chapter 4) from the time the log-on i~terrogation
LIDU was sent, the GES management shall send
another log-on interrogation LIDU to the AES. The
GES management shall retransmit the log-on interrogation
LIDU to the AES every tG8 seconds until a logon
acknowledgement LIDU is received or the total
number of times the log-on interrogation LIDU has
been sent equals five. When tG8 seconds has elapsed
after the transmission of the fifth log-on interrogation
LIDU without receiving a log-on acknowledgement
LIDU from the AES, the GES management shall
delete the AES from its AES log-on status table and
shall send log-off information to the other GESs in the
same satellite service area.
b) If a log-on acknowledgement LlDU is received from
the AES, the GES management shall set the activity
indicator for the AES in the AES log-on status table to
"active".
4.10.4.3.4.3 Indirect verijication
The AES shall remain inactive for twelve hours before the
GES management considers it logged off.
4.10.4.3.4 ~ G - O NVE RIFICATION
4.10.4.3.5 LOG-ON PROMPT
Note.- The AES log-on status table in the GES management
contains an activity indicatorfor each AES logged on to the GES.
The uctiviry indicator for the AES is set to "active " whenever any
dclta~signnllingis ~ceivedfr om the AES. The activity indicator
is set to "inactive" if na data or signalling is received f i m t h ~
Upon receipt of an R channel SU (ISU or a C channel access
request SU) by the GES link layer from an AES which is not
in its AES log-on status table, the GES management shall send
a log-on prompt LIDU to the AES.
Annex 10 - Aeronautical Telecommunications Volume ZZI
4.10.4.3.6.1 The GES management shall have the capability
to reassign the data channels to a logged-on AES.
4.10.4.3.6.2 Upon receipt of a data channel reassignment
request, the GES management shall forward a log controvdata
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