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C channel signalling other than requestlassignment
Flight safety C channel requestlassignrnent
signalling
Flight safety packet-mode data
Other "safety" C channel requestlassignment
signalling
"Non-safety" C channel requestlassignment
signalling; "non-safety" T channel request
'signalling (Q = 0-3)
Other "safety" packet-mode data (See Table 4-12)
Reserved for "non-safety" C channel precedence
"Non-safety" packet-mode data (See Table 4-12)
System table .broadcast SUs and fill-in SU
Code Function 44. Reason (4 bits)
0 No associated P/R channel control SU
1 Associated P/R channel control SU exists
42. PIS (primarylsecondary)
(1 bit)
This field shall indicate whether the bg-on is primary or
secondary.
Code Function
0 Primary log-on
1 Secondary log-on
43 . Q number (precedence)
(4 bits)
Code Function
0 Log-on table full
1 Requested voice channel
characteristic not available
2 Requested beam not served
3 Fixed network failure
4 Unassigned
$ Invalid satellite ID
6 Invalid GES ID
7 P Mch annels not
available
8 Packet-mode data
services not available
9 Reserved
10 Requested VCC and data
services not available
1 1-1 3 Unassigned
14 Other unspecified reason
15 U Sno t authorized
Rejection category
Temporary unavailable
Permanent unavailable
Invalid parameters
Temporary unavailable
Invalid parameters
Invalid parameters
Temporary unavailable
Permanent unavailable
Permanent unavailable
Temporary unavailable
Permanent unavailable
The following tablc shall indicate the scheme for the 45. Received bit error
assignment of Q numbers to the various categories of rate (8 bits)
messages for transmission on the P, R, T and sub-band C
channels. The actual Q numbers assigned to the individual This field shall indicate the error rate before FEC decoding.
signal unit message types shall be as specified in the message The code value = V, where V = average number of errors per
type list at the end of this appendix. 2 560 channel bits.
Part Z Annex 10 - Aeronautical Telecommunic~tions
46. Reference number (3 bits for preceded by either an W C LSU or TACK LSU indicating
R channel or 4 or 8 bits errors.
for P and T channels)
Code Function
The value for this field shall be assigned by the AES for airto-
ground data transfer and by the GES for ground-to-air data 0 Not preceded by either RFC LSU or TACK SU set
transfer. The scope of the reference number shall be within its indicating errors
Q number (precedence level). The reference number, in 1 Has been prcceded by either an RFC LSU or TACK
association with the Q number, shall be used for message SU set indicating errors
segmentation/assembly and ARQ error control at the link
level.
Each user data message shall be given a reference number 51. S (coding standard)
at the time of initial transmission and this is used in (1 bit)
subsequent acknowledge, retransmission, and request for
acknowledge messages to guard against confusiodduplication m e field shall identify he rules (coding standard) according to
of messages. The allocation of the reference numbers shall be which he location, cause class and cause value infomation
performed independently for messages sent via the R, T and P elements are coded.
channels.
Code Function
47. Report type (4 bits)
This field shall identify the specific type of call progress signal
unit.
Code Function
Unassigned
Channel status report
Connect
Test
Call attempt result
Channel release
Reserved
Unassigned
0 CCllT Q.931 standard coding
1 Satellite network specific coding
52. Satellite flag
(1 bit)
Code Function
0 Indicating the SU contains information for the
satellite via which it is broadcast
1 Indicating the SU contains information for the
satellite in another region
53. Satellite ID
48. Reserved (variable (6 bits)
number of bits)
This field shall be the 6-bit identifier given to the satellite.
Fields marked RESERVED are reserved for use in particular
AMSS system implementations.
49. Revision number (8 bits)
This field shall indicate the revision number of the AES Code
system table. It shall be incremented by one for each
successive revision. 0
1
2
3
50. RFC flag (1 bit) 4
5
This field sllall be used to identify whether or not a reservation 6
(RES) SU or a reservation forthcoming (RFC) SU has been 7
　
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