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54. Satellite inclination
(3 bits)
Code Function
Fields marked RESERVED are reserved for use in particular
AMSS system implementations. 0 0 to 518 degree
I more than 518 up to 1018 degrees
2 more than 1018 up to I 518 degrees
49. Revision number (8 bits) 3 more than 15/8 up to 2018 degrees
4 more than 2018 up to 2518 degrees
This field shall indicate the revision number of the AES 5 more than 2518 up to 3018 degrees
system table. It shall be incremented by one for each 6 more than 3018 up to 3518 degrees
successive revision. 7 more than 3518 up to 40/8 degrees
50. RFC flag (1 bit) 55. Satellite longitude
(8 bits)
This field shall be used to identify whether or not a reservation
(RES) SU or a reservation forthcoming (RFC) SU has been This field shall be a binary code representation of the longitupreceded
by either an RFC LSU or TACK LSU indicating dinal location of the satellite, as east longitude relative to the
errors. Greenwich meridian in units of 1.5 degrees.
Part Z Annex 10 - Aeronautical Telecommunications
56. Satellite right,ascension
(8 bits)
This field shall indicate the closest time point expressed in
minutes from 00:OO UTC with 10 minutes increment to the
time when the satellite crosses the equatorial plane from south
to north on the New Year's day. The time of satellite ascension
on day "n" of the year shall be "4 x n" minutes earlier
than on the New Year's day.
57. SC (1 bit)
This field shall indicate the compliance of AES with SARPs.
Code Function
0 Not SARPs compliant
1 SAWS compliant
58. Sequence indicator
(4 bits)
This field shall be used only in extended length (i.e. 19 octet)
$Us on the R channel. It shall indicate the position of the SU
within the sequence of SUs that comprise an SU set. It also
specifies the total number of SUs in the SU set.
Number of SUs
Code SU position in the SU set
Unassigned Unassigned
1 1
1 (first) 2
2 (last) 2
1 (first) 3
2 (intermediate) 3
3 (last) 3
Unassigned Unassigned
59. Sequence number
(4 bits or 6 bits)
This field shall be used in standard length (i.e. 12 octet) signal
units on all channels. The field shall be set in an ISU of an
SU set to the total number of subsequent signal units (SSUs)
in the SU set and shall be decremented by one in each following
SSU, until the last SSU of the SU set has a value of 0.
The field in a broadcast index SU of the AES system table
broadcast shall be set to the largest sequence number (one less
than the number of LSUs included) in each series of broadcast
LSUs. The sequence number in the first LSU in a series shall
be set to the same number as in the index SU and shall be
decremented by one in each following LSU, until the last LSU
of the series has a value of 0. The field in an RTX SU
heading of a retransmission SU set shall be set equal to the
total number of SSUs in the retransmission SU set. In each
retransmitted SSU, this field shall be offset by subtracting the
value in the sequence number (offset value) field of the RTX
SU from the original SSU sequence number.
60. Sequence number (offset value)
(6 bits)
This field shall be used in standard. length (i.e. 12 octet) signal
units on all channels. It shall indicate the last (lowest) SSU
sequence number in error.
61. Service direction
(2 bits)
Code Function
0 Unassigned
1 Air-to-ground
2 Ground-to-air
3 Bi-directional
62. Service identity
(4 bits)
Code Function
Unassigned
Telephone
Circuit-mode data, analog-interconnect
Circuit-mode data, digital-interconnect
Unassigned
Direct link service message
Reliable link service message
Unassigned
63. Source (2 bits)
This field shall identify the location at which the signal unit
was generated.
Code Function
0 Unassigned
I AES
2 GES
3 Reserved
64. Spare (variable number
of bits)
Fields marked SPARE shall be filled entirely with zeros.
Annex 10 - Aeronautical Telecommunications Volume ZZZ
64a. Spot beam series (SPS)
(1 bit)
This field shall indicate, in the global beam series broadcast
index SU, whether or not a spot beam series is present. This
field shall be set to one if the spot beam series is present;
otherwise, the field shall be set to zero.
65. Starting frame number
(4 bits)
This field shall indicate, as a direct number, the starting frame
number of the allocated reservation.
66. Starting slot number
(6 bits!
This field shall indicate, as a direct binary number, the starting
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