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41 T channel control (ISU)
TDMA RESERVATION
50 Unsolicited reservation
5 1 T channel assignment
52 Reserved
53 Reservation forthcoming (RFC)
ACKNOWLEDGEMENT
60 Telephony acknowledge (PIC channel)
60 Telephony acknowldge (R channel)
61 Request for acknowledgement (RQA) (P channel) - distress data
61 Request for acknowledgement (RQA) (P channel) - all other data
61 Request for acknowledgement (RQA) (P channel) - distress data
61 Request for acknowledgement (RQA) (P channel) - all other data
Message format figure
(refer to Appendix 2 Q number
to Chapter 4) (precedence)
Part I Annex 10 - Aeronautical Telecommurtications
Message format figure
Code (refer to Appendix 2 Q number
(HEX) Function to Chapter 4) (precedence)
62 Acknowledge (RACK, TACK) (P channel) - distress data
62 Acknowledge (RACK, TACK) (F channel) - all other data
62 Acknowledge (PACK) (R channel) - distress data
62 Acknowledge (PACK) (R channel) - all other data
USER DATA
70 Reserved
7 1 User data (ISU) - RLS (PIT channel)
72 Retransmission header (RTX) (Fm channel)
73 Reserved
74 User data (3 octet LSDU) - RLS (P channel)
75 Reserved
76 User data (4 octet LSDU) - RLS (P channel)
NIA User data (ISUISSU) (R channel)
80 Broadcast reserved
81 AES system table broadcast-spot beam series GES PIR channel (partial)
82 AES system table broadcast-spot beam series GES beam support A2-60 NA
(partial)
83 AES system table broadcast-spot beam series GES P/R channel A2-56lA2-57 NA
(complete)
84 AES system table broadcast-spot beam series GES beam support
(comp\ete)
85 AES system table broadcast-spot beam series index A2-55 NA
86 AES system table broadcast-spot beam series satelliteheam ID (partial) A2-58lA2-59 NA
87 AES system table broadcast-spot beam series satellitelbeam ID A2-581A2-59 NA
(complete)
88 AES system table broadcast-spot beam series 2nd series of GES P/R A2-56lA2-57 NA
channel (complete)
SUBSEQUENT SIGNAL UNITS: bits 8-7 = I 1
Call information service address (SSU)
P R channel control (SSU)
T channel control (SSU)
User data (SSU) - (Pm channel)
All other codes are unassigned.
In the Q number column, message types with a variable Q number are indicated by V followed in brackets by the value or range
of values normally used.
Appendix 4 to Chapter 4
TIME-OUT VALUES
Time
tG 1
tG2
tG3
tG3A
tG3B
tG4
tG5
tG6
tG7
tG8
tG9
tGlO
tGl I
tG12
tG13
tG14
tG15
tG16
tG17
tG18
tG 19
tG20
tG2 1
t G22
tG23
tG24
tG25
tG26
tG27
tG28-tG29
tG30
tG3 1.
tG32
tG33
tG34
tG35
tG36
tAl
tA2
tA3
tA4
tA4A
tA4B
tA5
tA6
tA7
tA8(i) (Note 1)
Value (seconds)
9.3
5
1 X
Reserved
Reserved
2.5
Reserved
At the discretion of the GES operator
Unassigned
10
20 to 30
Tch (Note 3)
12
10
10
7
Unassigned
10
10
7
10
120 to 240
120 to 240
60 to 120
10
10
2
25
12
Unassigned
2
5 + 5* (P-Ch Frame Duration)
10
10
4
Tch (Note 3)
2
20 + (No. of SUs)*Ts (Note 2)
Unassigned
7.9 + RND (O,Z, - 1)*Ts (Notes 2, 4)
Unassigned
8
7.9 + RND (O,Z, - l)*Ts (Notes 2, 4)
4
8
7.9 + RND (0.2, - l)*Ts (Notes 2, 4)
(Delay to res)*8 + 2
Time Value (seconds)
Unassigned
5 + RND (O,Z, - I)*Ts (Notes 2, 4)
12 + RND (O,Z, - l)*Ts (Notes 2, 4)
10
10
10
Unassigned
20 to 30
10
15+RND (O,Z, - l)*Ts (Notes 2, 4)
Unassigned
Tch (Note 3)
Unassigned
5
Tch (Note 3)
10
10
K *Tch, K = 2 (Note 3)
10
20
10
Tch (Note 3)
20
10
Tch (Note 3)
5
(No. of SUs)*Tch (Note 3)
5
(NO. of SUs)*Tch (Note 3)
15
120 to 240
Unassigned
4 + 2* (P-Ch frame duration)
NOTES
1. Multiple timers as required, indicated by suffix (i).
2. Z, = Zo * 2k, ZO = 4 normally; Ts = R channel slot
duration and k is the number of retries; k = 0 for initial
transmission.
3. Tch = time required to transmit 1 SU on sub-band C
channel, e.g. 0.167 seconds for 21 000 bitsts channel.
4. RND(x,y) = function that randomly selects an integer
value from the interval [x,y]; all integers in the interval are
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