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29a. Global beam series (GBS)
(1 bit)
This field shall indicate, in the spot beam series broadcast
index SU, whether or not a global beam series is present. This
field shall be set to one if the global beam series is present;
otherwise. the field shall be set to zero.
30. Location (of cause) (4 bits)
This information element shall indicate the location relevant to
the cause value and cause class information elements. Its interpretation
shall be dictated by the value assigned to the S
(coding standard) information element, which specifies
whether the CCITT 4.931 standard coding or the satellite network
specific coding rules apply.
This field shall start from octet 5, bit 1 and shall end at octet CCITT Q.93 1 standard coding:
8, bit 8. Each bit shall correspond to a satellite beam, starting
from global beam in the first bit then spot beam 1, 2, 3, etc. Code Function
up to spot beam 31, respectively. 0 means the spot beam has 0 User
no P or R channel from chat GES. 1 means the GES has at 1 Private network serving the local user
least one P and R channel set in that beam. 2 Public network serving the local user
Annex I0 - Aeronautical Telecommunications Volume 111
Code Function
3 Transit network
4 Public network serving the remote user
5 Private network serving the remote user
7 International network
10 Network beyond interworking point
33. Message type (1 octet)
This field shall identify the type of the message. The complete
set of message types shall be as listed in the table "Message
type list" which is included at the end of this appendix.
All other values are reserved. 34. Network ID (4 bits)
Satellite network specific coding: Code Function
Code Function
1 AES - user network side
2 AES - satellite network side
3 GES - satellite network side
4 GES - fixed network side
5 Reserved
6 Interworking with the terrestrial network
Unassigned
E1641'163
X.121
E69
Private network - no address following
Private network - address following
To be coded for applicable public and private
networks (SITA, ARINC, etc.)
Distress call
All other values are unassigned.
35. NOT (1 bit)
This field shall indicate the transmitter capability of the AES.
Code Function
0 Indicating the AES has one transmitter
I Indicating the AES has multiple transmitters
31. LSU number (2 bits)
Code Function
0 Indicating the initial LSU and the LSU contains P,,,,
&,,O, Rs,,l frequencies in this order
1 LSU contains P , R,,,O, Rs,,l frequencies in this
order (as for code 0, but this can appear anywhere in
the sequence)
2 LSU contains R,,,2, Rs,,3, Rsm,4 frequencies in this
order
3 LSU contains Rs,,5, Rs,,6, R,,,7 frequencies in this
order
36. Number of bursts reserved
(3 bits)
This field shall identify the number of bursts reserved' as a
binary number.
31a. LOV (1 bit)
Code Function
This field shall indicate the capability of the AES to respond
to the log-on interrogation from the GES.
0 Unassigned
1-7 1-7 bursts reserved
Code Function
0 AES capable of responding
1 AES not capable of responding
37. Number of C channels
(4 bits)
This field shall indicate, as a direct binary number, the number
of voice channels which the AES is equipped for. This field
shall be 1 for Level 3 AES.
32. Message length (7 bits)
This field shall indicate, in direct binary number, the number
of SUs in an SU set (2 user octets in the initial signal unit,
and 8 octets per subsequent signal unit). When used for
requesting T channel capacity, this number shall be increased
by one each time a request (initial or repeated) is transmitted
via the T channel. The maximum length of an initial SU set
shall be limited to 64 (SUs).
38. Number of frequencies
(4 bits)
This field shall indicate, as a direct binary number (e.g. 1 = 1
frequency), the number of frequencies assigned.
Annex 10 - Aeronautical Telecommunications
39. Number of octets in
the last SSU (4 bits)
This field shall indicate, as a direct binary number (e.g. 1 = 1
octet), the number of octets of user data in the user data field
of the last SSU of the SU set.
40. Number of SSUs
(in ACIUNAK) (2 bits)
Code Function
0 No SSU, only used when ACKCTL field equals 14
or 15
1 One SSU
2 Two SSUs
3 Three SSUs
41. PA2 MSG (1 bit)
This field shall indicate whether the log-on confirm SU has an
associated P/R channel conlrol SU.
Code Function
0 No associated P/R channel control SU
　
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