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54. Satellite inclination
(3 bits)
Function
0 to 518 degree
more than 518 up to 1018 degrees
more than 1018 up to 1518 degrees
more than 15/8 up to 2018 degrees
more than 2018 up to 25/8 degrees
more than 2518 up to 3018 degrees
more than 3018 up to 3518 degrees
more than 3518 up to 4018 degrees
YlUOO
No. 7s
Annex 10 - Aeronautical Telecommunications Volume ZZZ
55. Satellite longitude retransmitted SSU, this field shall be offset by subtracting the
(8 bits) value in the sequence number (offset value) field of the RTX
SU from the original SSU sequence number.
This held shall be a binary code representation of the
longitudinal location of the satellite, as east longitude relative
to the Greenwich meridian in units of 1.5 degrees. 60. Sequence number (offset value)
(6 bits)
56. Satellite right ascension
(8 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.
This field shall indicate the closest time point expressed in
minutes from 00:00 UTC with 10 minutes increment to the
time when the satellite crosses the equatorial plane from south 61. Service direction
to north on the New Year's day. The time of satellite ascension (2 bits)
on day "n" of the year shall be "4 x n" minutes earlier than on
the New Year's day. Code Function
0 Unassigned
58. Sequence indicator
(4 bits)
This field shall be used only in extended length (i.e. 19 octet)
SUs 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.
Code SU position
Unassigned
1
1 (first)
2 (last)
1 (first)
2 (intermediate)
3 (last)
Unassigned
Number of SUs
in the SU set
Unassigned
1
2
2
3
3
3
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
Code
62. Service identity
(4 bits)
Function
Unassigned
Telephone
Circuit-mode data, analog-interconnect
Circuit-mode data, digital-interconnect
Unassigned
Direct link service message
Reliable link service message
Unassigned
62a. SIN/DOU (1. bit)
This bit shall be set to 0 if one channel bit rate and EIRP is
defined in the signal unit. This bit shall be set to 1 if two
channel bit rates and EIRPs are defined in the signal unit.
63. Source (2 bits)
This field shall identify the location at which the signal unit
was generated.
Code Function
0 Unassigned
1 AES
2 GES
3 Reserved
Annex 10 - Aeronautical Xelecommunicaiions
64. Spare (variable number
of bits)
Fields markcd SPARE shall be filled entirely with zeros.
64a. Spot beam series (SBS)
(1 bit)
This field shall indicate, in the global beam series broadcast
index SZJ, 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 bib)
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
slot number of the allocated reservation within the starting
frame number.
67. SU type (4 bits)
This field shall indicate whether the extended length SU is
carrying signalling application infonnation or user data. In the
latter case, its value shall represent the number of octets of
user data in the user data field of the extended length (i.e. 19
　
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