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4.9.3.2.3 AEs SYSTEM TABLE UPDATE
4.9.2.1.4 CIRCUIT-MODE SERVICES
For updating the contents of the system tables, the AES
management shall use the following procedures:
The information exchanged between the AES management and a) Prior to lag-on. Once the AES management receives a
the circuit-mode services shall include the following: broadcast sequence on a satellitelbeam-identifying P,,,
channel frequency, it shall determine whether the
a) to circuit-mode services: received sequence is a partial sequence or a complete
sequence (see 4.10.4.5.2)a nd then do the following:
1) log-on status, (1.e. logged odogged off);
1) if it is a partial sequence, the AES management shall
2) log-on GES ID; compare the revision number specified in the
received partial sequence with tlie revision number of
3) channel unit number in response to each request lor the corresponding current data segment in the sysr~m
a channel unit assignment; table. If the received revision number is one higher
Annex 10 - Aeronautical Telecommunications Volume IZZ
lhan the current number, the AES shall update its
system table according to the received sequence. If
the received revision number differs from the current
number by more than one, the AES management
shall wait for the following- complete sequence and
update its system tabla accordingly.
2) if the received sequence is a complete sequence, the
AES shall update its system table accordingly.
b) After log-on. When the AES management receives a
partial sequence from the log-on GES, it shall update its
system table accordingly.
4.9.3.2.4 LOG-ON CONFIRM TABLE
This table shall include the following:
a) satellite ID;
b) beam ID;
c) log-on GES ID;
d) initial EIW for R channels;
e) Pd channel frequency and channel rate;
9 Rd channel frequencies and channel rate;
g) T channel frequencies and channel rate;
h) number of C channels supportable by the AES
simultaneously (including a C channel that utilizes a
transmitter that is shared by the C, R and T channels for
Level 3 AES).
4.9.3.2.5 LOG-ON CONFIRM TABLE UPDATE
The content of the log-on confirm table, except for item h),
shall be updated whenever the AES management logs on,
renews its log-on or completes a data channel reassignment
procedure with the GES (4.9.3.3.4.2 f)).
4.9.3 -3.2 SATELLITE, BEAM AND GES SELECTIONS
The satellite, beam and GES selections shall be made such that
the AES is capable of receiving an adequate signal level on a
P, channel of the selected GES. The adequacy of the signal
level shall be based on receiving a P channel synchronization
indication (4.9.2.1.3 b)) from the physical layer. The
information used to make these selections shall be as specified
in the most current version of the system table. The currency
of the system table shall be determined by comparing the
revision number (Appendix 3 to Chapter 4, Item 49) of the
system table currently held at the AES with the revision
number of the system table broadcast received on the
satelliteheam-identifying P, channel. If necessary, the
system table shall be updated in accordance with 4.9.3.2.3.
4.9.3.3.3 LOG-ON PROCEDURE
4.9.3.3.3.1 Initiation of a log-on procedure with the
selected GES shall be either automatic or in response to a
received command. The AES management shall initiate the
log-on procedure immediately following the selection of a
log-on GES. When the AES is able to receive a satelliteidentifying
P, channel, and does not have an equipment
fault, it shall always be logged on to a selected GES during
those periods when AMS(R)S operation is intended.
4.9.3.3.3.2 To log on to the selected GES, the AES
management shall transmit a log-on request LIDU to the GES
on an Rsmc channel frequency randomly selected from the
GES RSmc channel frequencies given in the system table. The
AES management shall then do the following:
a) If d l 1 seconds (Appendix 4 to Chapter 4) elapses
without receiving a response from the GES as specified
in b) to e) below, the AES management shall command
the selection of an R,,, channel frequency and then
retransmit the log-on request LIBU to the selected GES.
The AES management shall command the selection of
an Rs,, channel frequency and then retransmit the logon
request LlDU every tAI 1 seconds until a response is
received, except that the number of transmissions of the
log-on request LDU shall not exceed 5. If, after the fifth
transmission, a response is not received within tAll
seconds, the AES management shall abort the log-on
procedure to the current selected GES, select a GES
　
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