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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 LDU to an
AES, the GES management shall consider the AES as logged
off.
4.10.4.3.4 LOG-ON VERIFICATION
a) If no log-on acknowledgement LIDU is received from
the AES within tG8 seconds (Appendix 4 to Chapter 4)
from the time the log-on interrogation LIDU was sent,
the GES management shall send another log-on
interrogation LlDU to the AES. The GES management
shall retransmit the log-on interrogation LIDU to the
AES every tG8 seconds until a log-on acknowledgement
LIDU is received or the total number of times the logon
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 logon
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 vergcation
The AES shall remain inactive for twelve hours before the
GES management considers it logged off.
4.10.4.3.5 LOG-ON PROMPT
Note-- The AES in the GES Upon receipt of an R channel SU (ISU or a C channel access
management contains an activity indicator for each AES SU) by the GES link layer from an AES which is not
logged on to the GES. The activity indicatorfor the is set in its AES log-on status table, the GES management shall send
to "active" whenever any dutdsigrtalling is received from the a log-on prompt LIDU to the AES.
AES. The activiry indicator is set to "inactive" if no data or
signalling is received fmm the AES within tG6 seconds
(Appendix 4 to Chapter 4) from the time the activity indicator
wus last set to "active". 4.10.4.3.6 CHANNERLE ASSIGNMENT
4.10.4.3.4.1 The GES management shall verify the AES 4.10.4.3.6.1 The GES management shall have the
activity status by either of the following two methods: capability to reassign the data channels to a logged-on AES.
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 verification
If no datdsignalling is received at the log-on GES or at
another GES in he 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 LIDU to the AES. The GES management shall
then do the following:
4.10.4.3.6.2 Upon receipt of a data channel reassignment
request, the GES management shall forward a log controYdata
channel reassignment LDU to the MS. The GES
management shall then do the following:
a) If no response is received from the AES within tG31
seconds (Appendix 4 to Chapter'4) from the time the log
controlldata channel reassignment LDU was sent to the
AES, the GES management shall send another log
controudata channel reassignment LIDU to the AES. If
no response is received again within the tG31 seconds,
the GES management shall abort the data channel
reassignment procedure.
b) If data channel reassignment reject LIDU is received
from the AES, the GES management shall abort the data
channel reassignment procedure.
2/lUUO
No. 75
Annex 10 - Aeronautical Telecommunications Volume 111
c) If a log controYready for assignment LLDU is received 4.10.4.4.2.2 AES channel conJguration
from the AES, the GES management shall transmit a assignment and agustment
log-on confirm LlDU followed by a PR channel control
LIDU and a T channel control LDU, as required, 4.10.4.4.2.2.1. During log-on, the GES management shall.
containing the reassigned channel information to the assign a Pd channel to an AES in a manner which ensures that
AES. The GES management shall then do the following: the performance requirements in 4.7 and 4.8 are met.
1) If no response is received from the AES within tG32
seconds (Appendix 4 to Chapter 4) from the time the
log-on confirm LIDU followed by the channel
control LIDUs were sent, the GES management shall
send another log-on confirm LIDU on the previous
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