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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 lo
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 4.9.3.3.3.
4.9.3.3.4.2.1 Recommendation.- Upon receipt of a 4.9.3.3.4.4 The AES management shall respond to the
universal time broadcast LIDU from the GES, the AES indications relayed to it via the AES physical layer interface as
management should make the time infomtion in the LIDU follows:
available to the appruprinte application processes within the
aircraft. The time information in the LIDU should be Pd channel Ioss/degmdation indication: the AES
considered correct at the instant of reception of the first bit of management shall either attempt to (1) reacquire an
the next P channel supe@ame (4.4.2). adequate signal level on the same Pd channel and
4.9.3.3.4.3 The AES management shall respond to
received commands as follows:
a) log-off command: the AES management shall transmit a
log-off request LIDU to the GES, relay the log-off status
on the AES management interfaces as specified in 4.9.2,
and then do the following:
1) if a log-off acknowledgement LDU from the GES is
not received within tAlO seconds (Appendix 4 to
Chapter 4) from the time the log-off request LIDU
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 Pd channel. C channel transmissions
for an existing circuit-mode call shall be allowed to
continue provided the bit error rate of received C
channel transmissions does not exceed its nominal value
for any subsequent period of more than 40 seconds.
Part 1 Annex 10 - Aeronautical Telecommunications
4.9.3.4 hES CHANNEL MANAGEMENT
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 R, channels shall be as provided in the system
table. The frequencies and channel rates for the Pd, Rd and T
channels shall be as instructed by the GES in the log-on
confirm LIDU 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
settings by communication with the physical layer and shall
relay these assignments and settings back to the circuit-mode
services. However, the AES management shall ensure that no
assigned frequencies are used for transmission that could
generate intermodulation products that produce harmful
interference to on-aircraft satellite navigation receiver
operation and shall pre-empt a lower priority call if necessary.
4.9.3.4.1.2.1 The AES management shall carry out the
randomized selection of R channel frequencies in response to
commands generated by protocols in the link layer, circuitmode
services and the AES management itself. Every selection
shall persist until, another such random selection is made.
4.9.3.4.1.3 Channel unit power control. The AES
management shall control the EIRP settings of each of the
AES transmit channels via the AES management-physical
layer interface.
4.9.3.4.1.3.1 The AES management shall use the EIRP
setting in 4.2.3.5.5 for transmission of the log-on request
LIDU on the R,,, channel. Thereafter, the AES management
shall set the EXRP on the Rd channel to the initial EIRP setting
value communicated to it by the GES, either via thc log-on
confirm LIDU, or via the data EIRP broadcast LDUs. If the
initial EIRP is obtained from the log-on confirm LDU, the T
channel initial EIRP setting shall be computed according to the
ratio of Rd channel and T channel channel. rates and the
assigned Rd channel initial EIRP.
Note.- The log-on GES is responsible for determining the
　
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