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The M S shall refrain from any attempt to log-on to
this GES for the duration of time specified in the
LIDU starting at the time of receipt of the LIDU,
except for distresslurgency log-on.
4.9.3.3.4.2.1 Recommendation.- Upon receipt of a
universal time broadcast LlDUfrom the GES, the AES should
make the time information in the LIDU available to the appmpriate
application processes within the aircraft. The time
information in the LIDU should be considefed correct at rhe
instant of reception of the $rsr bit of the next P channel
supelframe (4.4.2).
4.9.3.3.4.3 The AES management shal-l respond to
received commands as follows:
a) log-off command: the U S management shall transmit
a log-off request LIDU to the CrES, relay the log-off
status on the AES management interfaces as specified
in 4.9.2, and then do the following:
I) if a log-off acknowledgement LIDU from the GES
is not received within tAlO seconds (Appendix 4
to Chapter 4) from the time the log-off request
LIDU was transmitted, the AES management shall
retransmit another log-off request LIDU. The AES
management shall retransmit the same EDU every
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 tAlO
seconds from the time of the fifth transmission, a
log-off acknowledgement LDU 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 AES logged off;
b) GES-to-GES hundover 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
circuit-mode calls. After all calls are cleared, the
AEs management shall select a suitable beam in the
service area of the specified satellite. If a suitable
beam cannot be found, the AES management shall
select a different satellite and a beam within its service
area according to 4.9.3.3.2. The AES management
shall then select, according to 4.9.3.3.2. a GES that
supports the selected beam and shall automatically log
on to the selected GES using the procedure in
4.9.3.3.4.4 The AES management shall respond to the
indications relayed to it via the AES physical layer interface
as follows:
P, channel los.ddegradation indicatiori: the AES management
shall either attempt to (1) reacquire an adequate signal
level on the same P, channel and resume normal operation,
or (2) renew its log-on to the same GES by re-initiating the
log-on procedure to the same GES, or (3) re-initiate the
satellite, beam and GES selection and the log-on process as
specified in 4.9.3.3.2 and 4.9.3.3.3 respectively. All R and T
channel transmissions shall be inhibited if there is a loss or
degradation of the P, channel. C channel transmissions for
an existing circuit-mode call shall be allowed to continue
PU~ZI Annex 10 - Aeronautical Telecommunications
provided the bit error rate of received C channel
msmissions does not exceed its nominal value for any
subsequent period of more than 40 seconds.
4.9.3.4 AES CHANNEL MANAGEMENT
4.9.3.4.1 CHANNEL UNlT CONTROL
4.9.3.4.1.1 The AES management shall control all of the
AES transmit and receive channel units via the interface with
the AES physical layer.
4.9.3.4.1.2 Channel unit frequency and channel rate
control. The AES management shall control the frequencies
and channel rate settings of all the AES receive and transmit
channel units. The frequencies and the channel rates for the
P,,, and K,, channels shall be as provided in the system table.
The frequencies and channel rates for the P,, % and T
channels shall be as instructed by the GES in the log-on
confirm LZDU and the P/R channel control and the T channel
control LIDUs. When the AES management receives from the
circuit-mode services a request for assignment of transmit and
receive channel units with certain settings of frequencies and
channel rates, it shall accomplish these assignments and
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