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Note.- Details on ADS-B application functions are
contained in the Manual on VDL Mode 4 Technical
Specifications.
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Annex 10 - Aeronautical Telecommunications
TABLES FOR CHAPTER 6
Table 6-1. Modes 2 and 3 data encoding
Table 6-2. Modes 2 and 3 modulation stability
Table 6-3. Scrambler functions
VDL Mode
Mode 2
Mode 3
Function Data in Data out
scrambling clean data scrambled data
Aircraft Modulation
Stability
s 0.0050 per cent
* 0.0005 per cent
descrambling scrambled data clean data
Ground Modulation
Stability
0.0050 per cent
k 0.0002 per cent
Table 6-4. Physical services system parameters
Symbol Parameter name Mode 2 value
P 1 Minimum transmissio~l length 131071 bits
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No. 76
Annex I0 - Aeronautical Telecommunications
FIGURES FOR CHAPTER 6
Figure 6-1. Transmitter Power Stabilization
Power at 90 per cent
by t= -3
Major divisions are Centre of first symbol of unique word
symbol periods
Volume IZI
I
Data out
Legend:
- 2 - 1 0
I
1 clock period delay
initial value
stage number'
4
I
module 2 adder (exclusive OR): @
I
Figure 6-2. PN-generator for bit scrambling sequence
Part Z Annex 10 - Aeronautical Telecommunications
Figure 6-3. Receive to Wansrnit 'hrnaround Time
Current Access
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No. 76
reception attempt
completes
J4
occurs
\
1.5 msec
90 per cent power, corresponds to time - 3
(see Figure 6-1)
1.25 msec
+------
Annex 10 - Aeronautical Telecommunication~s Volume 111
Appendix to Chapter 6
REFERENCES
1. REFERENCES
References to Standards from the International Organization for Standardization {ISO) are as specitied (including date published)
below. These IS0 Standards shall apply to the extent specified in the SARPs.
2. NORMATIVE REFERENCES
These SARPs reference the following IS0 documents:
Date
published
- -- -
Information technology - IS0 7-bit coded character set for
information interchange
HDLC Procedures - Frame Structum, Version 3
HDLC Elements of Procedures, Version 3
OSI Basic Reference Model, Version 1
HDLC Procedures - Consolidation of Classes of Procedures,
Version 1
lnfonnation Processing Systems - Data Communications -
X.25 Packet Level Proiacol for Data Terminal Equipment
HDLC Procedures - General Purpose XID Frame
lnformafion Field Content and Fornut, Version [I]
OSI Data Link Service Definition, Version 3
Local Area Networks - MAC Service Definition, Version 1
3/90
2nd ed.
12/93
3. BACKGROUND REFERENCES
The following documents are listed as reference material.
Date
Originator Etle published
ITU-R Recommendation 5.446.4, Annex I
CCSDS Telemetry Channel Coding, Recornmendation for Space Data 5/92
System Standards, Consultative Committee for Space Date
Systems, CCSDS 101.0-B-3, Blue Book
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CHAPTER 7. SUBNETWORK INTERCONNECTION
[to be developed]
ANNEX 10 - VOLUME 111
Part 1 Annex 10 - Aeronautical Telecommunications
Note 1.- If a station does retransmit all unacknowledged
I-frames after a time-out, it must be prepared to receive a
subsequent REJ frame with an N(R) greater than its send
vuriuble V(S).
Note 2.- Since contention may occur in the case of
two-way alternate communications in ABM or ADM, the timeout
intervul employed by one combined station must be gmater
than that employed by the other combined station so as to
permit contention to be resolved.
8.6.4.3.3 FCS error: Any frame with an FCS error shall
not be accepted by the receiving station and will be discarded.
No action shall be taken by the receiving station as the result
of that frame.
8.6.4.3.4 Frame reject exception condition. A frame reject
exception condition shall be established upon the receipt of an
error-free frame which contains an invalid or unimplernentcd
control field, an invalid N(R), or an information field which
has exceeded the maximum established storage capability. If a
frame reject exception condition occurs in a combined station,
the station shall either:
b) when the mode-setting commands are different, each
combined station shall enter ADM and issue a DM
response at the earliest respond opportunity. In the case
of DISC contention with a different mode-setting
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