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1 Associated P/R channel control SU exists
42. PIS (primarylsecondary)
(1 bit)
This field shall indicate whether the log-on is primary or
secondary.
Code Function
0 Primary log-on
1 Secondary log-on
43. Q number (precedence)
(4 bits)
The following table shall indicate the scheme for the assignment
of Q numbers to the various categories of messages for
transmission on the P, R, T and sub-band C channels. The
actual Q numbers assigned to the individual signal unit
message types shall be as specified in the message type list at
the end of this appendix.
Code
15
3 4
13
12
I I
10
9
5-8
4
0-3
NA
Function
Distress/urgency C channel request/assignment
signalling; distresslurgency T channel request signalling;
all T channel assignment signalling (including
reservation forthcoming signalling); link layer protocol
signalling for distress data traffic (Q = 14)
Distress/urgency packet-mode data
Link layer protocol signalling for flight safety, other
safety and non-safety data traffic (Q = 0-3, 5-8, 11);
AESIGES management SUs; flight safety and other
"safety" T channel request signalling (Q = 11, 5-8);
C channel signalling other than requestlassignment
Flight safety C channel request/*assignment signalling
Flight safety packet-mode data
Other "safety" C channel request/assigrlment
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 4-1 2)
System table broadcast SUs and fill-in SU
44. Reason (4 bits)
Code Function Rejection category
0 Log-on table full
1 Requested voice channel
characteristic not available
2 Requested beam not served
3 Fixed network failure
4 Unassigned
5 Invalid satellite ID
6 Invalid GES ID
7 PIRtT channels not
available
8 Packet-mode data
services not available
9- 1 3 Unassigned
14 Other unspecified reason
15 AES not authorized
Temporary unavailable
Permanent unavailable
Invalid parameters
Temporary unavailable
Invalid parameters
Invalid parameters
Temporary unavailable
Permanent unavailable
Temporary unavailable
Permanent unavailable
45. Received bit error
rate (8 bits)
This field shall indicate the error rate before FEC decoding.
The code value = V, where V = average number of errors per
2 560 channel bits.
Annex 10 - Aeronautical Telecommunications Volume 121
46. Reference number 13 bits for Code Function
R channel or 4 or 8 bits
for P and T channels)
0 Not preceded by either RFC LSU or TACK SU set
indicating errors
1 Has been-preceded by either an RFC LSU or TACK
The value for this field shall be assigned by the AES for air- SU set indicating errors
to-ground data transfer and by the GES for ground-to-air data
transfer. The scope of the reference number shall be within its
Q number (precedence level). The reference number, in
association with the Q number, shall be used for message
segmentation/assemblY and ARQ error control at the link level.
51. S (coding standard)
(1 bit)
The field shall identify the rules (coding standardj according
Each user data message shaII be given a reference number
to which the location, cause class and cause value information
at the time of initial transmission and this is used in elements are coded.
subsequent acknowledge, retransmission, and request for
acknowledge messages to guard against confusion/duplication
of messages. The allocation of the reference numbers shall be . Code Function
performed independently for messages sent via the R, T and 0 CCIX Q.93 1 standard coding
P channels. 1 Satellite network specific coding
47. Report type (4 -bits)
This field shall identify the specific type of call progress signal Code Function
unit.
Code Function
0 Unassigned
I Channel status report
2 Connect
3 Test
4 Call attempt result
5 Channel release
6 Reserved
7- 15 Unassigned
48. Reserved (variable
number of bits)
52. Satellite Aag
(1 bit)
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 LD
(6 bits)
This field shall be the 6-bit identifier given to the satellite.
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