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1-1 3 Number of retransmission request ACK messages
remaining (applicable for PACK 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)
This field shall be the 24-bit ICAO identifier of the AES.
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 AES from the range 8- 15.
5. Beam 1D (6 bits)
Code Function
0 Global beam
1-63 Spot beams
8. Calledlcalling terminal
(8 bits)
Binary coded decimal (BCD) encoding, with the most significant
digits appearing in least significant half octet, and vice
versa.
9. Cause- class (3 bits)
The assignment and interpretation of this field shall be dictated
by the value assigned to the S (coding standard) field
(Item 51). Cause class shall be used jn association with cause
value (Item 10) to identify the actual cause meaning.
CClTT 4.93 1 standard coding:
Code Function
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 Interworking
Satellite network specific coding:
Code Function
0 PSTNDSDN call progress events
I Call pre-emption
2 Resource unavailable
3 Invalid parameter
4 Out of service
5 Network failure
6 Serviceloption not supported
7 Normal event
Annex 10 - Aeronautical Telecommunications
10. Cause value (4 bits) 11. Channel bit rate (receive or
transmit) (4 bits)
The assignment and interpretation of this field shall be dictated
by the value of the S (coding standard) field (Item 5 I). Cause
value shall be used in association with cause class (Item 9) to
identify the actual cause meaning. The values given below are
those required for interworking with the PSTN signalling
systems R2, CCITT No. 5 and CC1n No. 7 TUP.
CCITI Q.93 1 standard coding:
Cause Cause
class value Function
Unallocated number
No route to destination
Normal clearing
User busy
No user responding
Called user busy (user alerted)
Call rejected
Destination out of service
Invalid (incomplete) number format
Normal, unspecified
No circuirlchannel available
Network out of order
Switching equipment congestion
Channel type not implemented
Code Function
600 bitsls
1 200 bitsls
2 400 bits/s
4 800 bitsls
6 000 bitsls
5 250 bitsls
10 500 bitsls
Unassigned
Unassigned
21 000 bits/s
Unassigned
12. C h a ~ eflr equency (2 octets)
Most significant bit: l=LHCP, O=RHCP
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 6 11.5000 MHz for transmit channels.
The all ZEROS code shall be used to denote the null value.
Satellite network specific coding:
13. Channel type (2 bits)
Cause Cause
class value Function
Address complete
Call preempted
NO channel available
NO channel unit available
Analog data equipment not available
Digital data equipment not available
Reserved
Invalid/incornplete 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
Undefined cause
This field shall identify the channel which was used for the
message being acknowledged.
Code Function
0 R channel
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
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