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Out of service
Network failure
Service/option not supported
Normal event
10. Cause value (4 bits)
Cause Cause
class value Function
Address complete
Call prc-empted
No channel available
No channel unit available
Analog data equipment not available
Digital data equipment not available
Reserved
Invalidlincomplete address
Destination out of service
AES not authorized
Incoming calls barred
Continuity failure or no response
Reserved
Required analog data rate not
supported
Required digital data rate not
supported
Voice channel type not supported
Service type not supported
User busy
Unallocated number
AES absent
Spot beam handover
Undefined cause
The assignment and interpretation of this field shall be dictated
by the value of the S (coding standard) field (Item 51). Cause
value shall be used in association with cause class (Item 9) to
identify the actual cause meaning. The values given below are 11. Channel bit rate (receive or
those required for interworking with the PSTN signalling transmit) (4 bits)
systems R2, CCITT No. 5 and CCITT No. 7 TUP.
Code Function
CCITT 4.931 standard coding:
Cause Cause
class value Function
0 1 Unallocated number
0 3 No route to destination
1 0 Normal clearing
1 1 User busy
1 2 No user responding
3 3 Called user busy (user alerted)
600 bitsls
1 200 bitsls
2 400 bitsls
4 800 hitsls
6 000 bitsls
5 250 bitsls
10 500 bitsfs
8 400 bit,sls
Unassigned
21 000 bitsfs
Unassigned
2.11 UOO
No. 75
Annex 10 - Aeronautical Telecommunications Volume ZZZ
12. Channel frequency (2 octets) Digital interconnect data service:
Most significant bit: l=spot beam, O=global beam
Least significant 15 bits: 0000 to 7FFF (HEX)
Frequency expressed as binary number N, where:
frequency (MHz) = Base (MHz) + N * 0.0025 MHz;
base = 1 5,10.0000 MHz for receive channels;
base = 1 61 1.5000 MHz for transmit channels.
Code Function
0 Data. mode not requiredlachieved
1 1 200 bits/s
2 2 400 bitsls
3 4 800 bitsls
4 9 600 bits/s
5-15 Unassigned
The all ZEROS code shall be used to denote the null value.
15. Circuit data requirement
(2 bits)
13. Channel type (2 bits)
This field shall be used by the AES to indicate whether all
This field shall identify the channel. which was used for the ground-to-air circuit-mode calls should be allocated circuitmessage
being acknowledged. mode data service-capable channel equipment by the GES, and
if so, which type of interconnect capability shall be required.
Code Function Code Function
0 Rchannel
1 P channel
2 T channel
3 Unassigned
14. Circuit data rate (4 bits)
This field shall be used by the AES to indicate the requested
circuit-mode data rate (modem type, if applicable). It shall also
be used by the GES to inform the AES of the actual data rate
achieved, which may be different from the requested data rate
if a multi-rate modem is used or if modem synchronization is
not achieved.
The coding shall be dependent on the type of circuit-mode
data service, as indicated by the service identity field
(Item 62).
Analog-interconnect data service:
Code Function
Data mode not requiredlachieved
1 200 bits/s: CCITT V.22
1 200 bits/s: CCrlT V.22 bis
2 400 bitsls: CCllT V.22 bis
4 800 bits/s: CCLTT V.32
9 600 bits/s: CCllT V-32
1 200 birs/s: CCllT V.23
Unassigned
Facsimile (Group 3) service: CCITT T.30
00 Circuit-mode data service not required
01 Analog interconnect service req~ired
10 Digital interconnect service required
11 Unassigned
16. Class of AES
(2 bits)
The AESs shall be classified according to their equipment
configuration and capabilities, as follows:
Class 1: Low gain antenna only, packet-mode services
only;
Class 2: Reserved;
Class 3: Hjgh gain or intermediate gain antenna, cixcuitmode
and packet-mode (simultaneous and nonsimultaneous)
se,wices;
Class 4: High gain or intermediate gain antenna, packetmode
services only.
Code Function
0 Class1
1 Reserved
2 Class 3
3 Class 4
17. CCITT CRC (16 bits)
Each signal unit shall contain 1 6 check bits (the last two
octets) for error detection. These check bits shall be calculated
from the first 10 octets of standard length SU, from the first 17
Annex 10 - Aeronautical Telecomrnunic~tions
octets of an extended length signal unit or from the first 4
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