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the phase is spec$ed in degrees deviation from linear;
Table 6-4. Scrambler functions
Function Data in Data out
scrambling clean data scrambled data
descrambling scrambled data clean data
Table 6-5. Physical services system parameters
Symbol Parameter name Mode 1 value Mode 2 value
P1 Minimum transmission length 16504 bits 131071 bits
Table 6-6. MAC service system parameters
Mode 1 Mode 2
Symbol Parameter name Minimum Maximum Default Default Increment
TM1 Inter-access delay 0.5 ms 125 ms 75.5 ms 4.5 ms 0.5 rns
TM2 Channel busy
P persistence
M1 Maximum number of 1 65 535 66 135 1
access attempts
Annex 10 - Aeronautical Telecommunications
Table 6-7. Address type field encoding
Bit encoding
27 26 25 Description type Comments
reserved
Aircraft
rcscrved
reserved
Ground station
Ground station
reserved
All stations broadcast
Future use
24-bit ICAO address
Future use
Future use
ICAO-administered address space
ICAO-delegated address space
Future use
All stations
Table 6-8. Broadcast address encoding
Broadcast destination Type field Specific address field
All aircraft 001 All ones
All ground stations of a 100 or 101, as Most significant bits: Variable length
particular provider necessary provider code
Remaining bits: All ones
All ground stations with 100
ICAO-administered addresses
All ones
All ground stations 101 All ones
All stations 11 1 All ones
Table 6-9. AVLC commands and responses
Commands Responses
INFO [Information] INFO
RR [Receive Ready] RR
XID [Exchange Identity] XID
TEST TEST
SREJ [Selective Reject] SRET [Selective Reject]
FRMR [Frame Reject]
UI [Unnumbered INFO] UA [Unnumbered Acknowledge]
DISC [Disconnect] DM [Disconnected mode]
6111197
No. 72
Annex 10 - Aeronautical Telecommunications
Table 6-10. Data link service system parameters
Volume III
Table 6-11. HDLC public parameter set identifier
Symbol
Tl,,,
T1m,
T1mu~,
T1e~p
T2
T3,,
T3m,
T3mu~t
T 3 e ~
T4
N1
N2
k
Parameter ID 0 0 0 0 0 0 0 0 HDLC public
parameter set
Parameter length 0 0 0 0 1 0 0 1
Parameter name
Minimum
Maximum
Delay before retmnsmission
Multiplier
Exponent
Delay before ACK
Minimum
Mavimum
Link initilization time
Multiplier
Exponent
Mavirnum delay between aircraft
transmissions ground
Maximum number of bits in any frame
Maximum number of transmissions
Window size
Pararnctcr value 0 0 1 1 1 0 0 0 character '8'
0 0 1 1 1 0 0 0 character '8'
0 0 1 1 1 0 0 0 character '8'
0 0 1 1 0 1 0 1 character '5 '
Minimum
0 s
1 s
1
1
25 ms
5 s
1 s
1
1
10 min
12 min
1144 bits
1
l frame
0 0 1 1 1 0 1 0 character ':'
0 0 1 1 0 0 0 1 character ' 1 '
Maximum
20 s
20 s
2.5
2.5
10 s
25 s
20 s
2.5
2.5
1440 min
1442 rnin
16504 bits
15
7 frames
0 0 1 1 1 0 0 1 character '9'
0 0 1 1 1 0 0 1 character '9'
Mode 1
default
5.5 s
15 s
1.45
1.7
500 ms
10.5 s
15 s
1.45
1.7
20 min
22 min
2168 bits
6
4 fmmes
6111W7
No. 72
Mode 2
default
1.0 s
15 s
1.45
1.7
500 ms
6 s
15 s
1.45
1.7
20 min
22 min
8312 bits
6
4 frames
Inc~ment
1 rns
1 ms
0.01
0.01
1 ms
I ms
I ms
0.01
0.01
1 min
1 min
1 bit
1
1 frame
Annex I0 - Aeronautical Telecommunications
Table 6-12. Timer T1 parameter
- --
Parameter ID 0 0 0 0 1 0 0 1 Timer Tl downlink
Parameter length 0 0 0 0 1 0 0 0
Parameter value '16 '15 '14 '13 112 111 110 19 (Tlmi")
18 17 16 15 14 13 12 11
'16 '15 '14 "13 lJ12 U ~ l '10 U9 P1rnm)
u8 u7 U5 U4 '-'3 u2 '4
Table 6.13 VDL private parameters
Bit 8 Bit 7 Purpose
0 0 General purpose information private parameter
0 1 Ground-initiated modification private parameter
1 0 Aircraft-initiated information private parameter
1 1 Ground-initiated information private parameter
Note.- IS0 8885 defines the group ident$er of the private parameter
function to be the hexadecimal value FO.
Table 6-14. Parameter set identification
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