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not achieved.
The coding shall be dependent on the type of circuit-mode
data service, as indicated by the service identity field
(Item 62).
Annex 10 - Aeronautical Telecommunications
Analog-interconnect data service:
Volume 111
Code Function
Code Function
Data mode not requiredfachieved
1 200 bitsls: CCITT V.23
1 200 bitsls: CCIIT V.22
1 200 bitsls: CCIR V.22bis
2 400 bitsls: CCITT V.22bis
4 800 bitsls: CCITT V.32
9 600 bitsls: CCIR V.32
Unassigned
Facsimile (Group 3) service: CCITT T.30
Digital interconnect data service:
Code Function
0 Data mode not required/achieved
1 1 200 bitsls
2 2 400 bitsls
3 4 800 bitsls
4 9 600 bitsls
5-1 5 Unassigned
15. Circuit data requirement
(2 bits)
This field shall be used by the AES to indicate whether all
ground-to-air circuit-mode calls should be allocated circuitmode
data service-capable channel equipment by the GES, and
if so, which type of interconnect capability shall be required.
Code Function
00 Circuit-mode data service not required
01 Analog interconnect service required
10 Digital interconnect service required
1 I Unassigned
16. Class of AES
(2 bits)
The AESs shall be classified according to their equipment
configuration and capabilities, as follows:
Class
Class
Class
Class
1: Low gain antenna only, packet-mode services
only;
2: Reserved;
3: High gain antenna only, circuit-mode and packetmode
(simultaneous and non-simultaneous)
services;
4: High gain antenna only, packet-mode services
only.
0 Class 1
1 Reserved
2 Class 3
3 Class 4
17. CCITT CRC (16 bits)
Each signal unit shall contain 16 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 octets of an extended length signal unit or from the first
4 octets of the burst identifier SU (Appendix 2 to Chapter 4,
Figure A2-47), using the following generator polynomial:
x'" +I2 + x5 + 1
(see CCITT Red Book, Recommendation X.25, Section 2.2.7)
At the receiving end, the check bits for each received signal
unit shall be calculated and if there is a mismatch with the
received check bits, the signal unit shall be discarded.
18. Data bit rate capability
(1 octet)
Each bit in this field shall indicate the availability ("I") or
unavailability ("0) of the corresponding channelhit rate
combination at the AES as follows:
Bit
I
2
3
4
5
6
7.8
Combination
Reserved
P-Ch 2 400 bitsls
P-Ch 4 800 bitsls
P-Ch I0 500 bits/s
R-/T-Ch 2 400 bitsls
R-IT-C h 10 500 bitsis
Unassigned
Note.- 0.6 and 1.2 kbiiYs P, R and T channels are
mandatory for all AESs.
19. Delay to RES (6 bits)
This field shall indicate the delay before the reservation will
be sent to the AES by the GES. The delay shall be given as
a direct binary number of superframes.
20. Digit
This field shall be a binary coded decimal digit. The end-ofdigits
code shall be combination F (HEX).
Part I
21. DLS/RLS (1 bit)
Code Function
Annex 10 - Aeronautical Telecomrnunications
26. Idle pattern
All zeros.
0 Direct link service (DLS)
1 Reliable link service (RLS)
27. Initial EIW (4 bits)
21a. Duration (6 bits)
The decimal equivalent of this field shall specify the length in
minutes of the period of time during which the AES shall
inhibit its log-on attempts to the specified GES.
22. EIW adjustment (4 bits)
This field shall be used to indicate the E mad justment value
relative to the current transmit level as follows:
Code Function
No adjustment
+I dB
+2 dB
+3 dB
Unassigned
-3 dB
-2 dB
-1 dB
23. Existence (1 bit)
Code Function
0 This series of broadcasts is not being transmitted
1 This series of broadcasts is being transmitted
24. GES ID (1 octet)
This field shall be the &bit identifier given to Che GES.
25. GES beam support table
(32 bits)
The EIRP value shall be equal to (10.5 + N) dBW where N is
the value of this field (range 0 to 15).
28. I/R (initiaurenewal) (1 bit)
.This field shall indicate whether the log-on request is initial or
for log-on renewal.
Code Function
0 Initial log-on
1 Log-on renewal
29. Length (8 bits)
This field shall be the direct binary representation of the
number of octets to follow.
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