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33. Message type
34. Network ID
35. NOT (number of transmitters)
36. Number of bursts reserved
37. Number of C channels
38. Number of frequencies
39. Number of octets in the last SSU
40. Number of SSUs (in Ack)
41. P/R MSG
42. PIS (primarylsecondary)
43. Q number (precedence)
44. Reason
45. Received bit error rate
46. Reference number
47. Report type
48. Reserved
49. Revision number
50. RFC flag
5 I, S (coding standard)
52. Satellite flag
53. Satellite ID
54. Satellite inclination
55. Satellite longitude
56. Satellite right ascension
58. Sequence indicator
59. Sequence number
60. Sequence number (off-set value)
61. Service direction
62. Service identity
62a. SINDOU (singleldouble)
63. Source
64. Spare
64a. Spot beam series (SPS)
65. Starting frame number
66. Starting slot number
67. SU type
68. TDMAMSG
69. Tx channel number
70. Universal time
71. Voice channel characteristics
ANNEX 10 - VOLUME I11
2/1UOC
No. 75
Annex 10 - Aeronautical Telecommunications Volume 111
SIGNAL UNIT FIELD CODING AND DESIGNATIONS
Note.- Codes are listed as their decimal values unless Code Function
indicated as hexdecimal by the letters HEX. Cedes marked
RESERVED are reserved for use in ynr~icular AMSS system 0 High gain
irnplernentutians. 1 Intermediate gain
2-15 Spare
1. ACWNAK (1 bit)
Code Function
0 NAK, retransmit indicated message
1 ACK, do not retransmit indicated message
la. AAS (1 bit)
This field shall indicatc that the GES supports the
"Abbreviated Call Establishment" procedure.
Code Function
0 The GES does not support the "Abbreviated Call
Establishment'' procedure.
1 The GES does support the "Abbreviated Call
Establishment" procedure.
4. Application reference
number (4 bits)
This field shall contain the direct binary number of the
reference number assigned by the circuit-mode services to the
circuit-mode call.
The application reference number shall uniquely identify a
call between an AESIGES pair. Application reference numbers
shall be assigned cyclically by the AES on air-to-ground calls
from the range 0-7 and by the GES on ground-to-air calls to a
given -4ES from the range 8-15.
5. Beam ID (6 bits)
Code Function
0 Global beam
1-63 Spot beams
2. Acknowledge control (4 bits)
Code Function
6. Burst intcrval (4 bias)
0 This ACK includes all retransmission requests
1 - 13 Number of retransinission request ACK messages
remaining (applicable for FACK and TACK SUs
only)
14 No errors in entire message
15 Retransmit entire message (applicable for PACK
and TACK SUs only)
3. AES ID (3 octets)
In a multi-burst reservation, this field shall indicatc that there
is one burst reservation per 2B1 frames, where BI=burst
interval.
7. Burst length (5 bits)
This field shall indicate the length of the burst in terns of the
number of signal units.
This field shall be the 24-bit aircraft address of the AES (see
Chapter 9).
8. CaUeUcalling terminal
(8 bits)
3a. Antenna gain (4 bits)
This field shall indicate the antenna gain for an AES of
Class 3-4 (see 16). This field shall be "spare" for class 1 AES.
Binary codcd decimal (BCD) encoding, with the most
significant digits appearing in least significant half octet, and
vice versa.
2/11/00
No. 75
Part I Annex 10 - Aeronautical Telecommunications
9. Cause class (3 bits) 1
1
The assignment and interpretation of this field shalf, he dictated 1
by the valuc assigned to the S (coding standard) field 1
(Item 51). Cause class shall be uscd in association with cause 2
value (Item 10) to identify the ach~al cause meaning. 2
1
Call rejected
Destination out of service
Invalid (incomplete) number li~rn~et
Normal, unspecified
No circuit/channel available
Network out of order
Switching equipment congestion
Channel type not implemented
CCITT 4.931 standard coding:
Code Function Satellite network specific coding:
0 Normal event
1 Normal event
2 Resource unavailable
3 Service or option not available
4 Service or option not implemented
5 Invalid message (e.g. parameter out of range)
6 Protocol error (e.g. unknown message)
7 Inkcworking
Satellite network specific coding:
Code Function
PSTNIJSDN call progress events
Call pre-emption
Resource unavailable
Invalid parameter
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