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Ground Modulation
Stability
+ 0.0050 per cent
2 0.0002 per cent
Symbol Parameter name Mode 2 value
Volume 111
P1 Minimum transmission length 131071 bits
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Part l Annex 10 - Aeronautical Telecommunications
Table 6-5. VDL Mode 4 operating on frequencies
between 108.0-111.975 MHz
Frequency Maximum level of unwanted
(MHz) signal at receiver input (dBm)
Table 6-6. VDL Mode 4 operating on frequencies
between 112.0-117.975 MHz
Frequency
(MHz)
Maximum level of unwanted
signal at receiver input (dBm)
Note.- The relationship is linear between adjacent points
designated by the above frequencies.
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Annex 10.- Aeronautical Teleconununications
FIGURES FOR CHAPTER 6
Figure 61. Trausmitter Power Stabihation
Power at 90 per cent
byt= -3
Major divisions are Centre of first symbol of unique word
symbol peliods
Volume 111
I
Data in Data out
Legend:
- 2 - 1 0
,
I
1 clock period delay
initial value
stage number,4
I
module 2 adder (exclusive OR): @
Figure 6-2. PN-generator for bit scrambling sequence
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No. 79
Part Z Annex 10 - Aeronautical Telecommunications
Figure 6-3. Receive to Transmit arnaround Time
Current Access
25111104
No. 79
er, corresponds to time - 3
1.25 msec
\
reception attempt
completes occurs L
*
\
1.5 msec
Annex I0 - Aeronautical Telecommunicahbns
Appendix to Chapter 6
REFERENCES
Volume I11
References to Standards fiom the International Organization for Standardization (ISO) are as specified (including date published)
below. These IS0 Standards shall apply to the extent specified in the SAWS.
2. NORMATIVE REFERENCES
These SAWS reference the following IS0 documents:
IS0 Title
646 Infonnation technology - IS0 7-bit coded character set for
information interchange
3309 HDLC Procedures - Frame Structure, Version 3
4335 HDLC Elements of Procedures, Version 3
7498 OSI Basic Reference Model, Version I
7809 HDLC Procedures - Consolidation of Classes of Procedures,
Version I
8208 Information Processing Systems - Data Communications -
X.25 Packet Level Protocol for Data Terminal Equipment
8885 HDLC Procedures - General Purpose XID Frame
Information Field Content and Format, Version [I]
8886.3 OSI Data Link Service Definition, Version 3
10039 Local Area Networks - MAC Service Dejnition, Version I
Date
published
3/90
2nd ed.
12/93
3. BACKGROUND REFERENCES
The following documents are listed as reference material.
Originator Title
Date
published
ITU-R Recommendation S.446.4, Annex I
CCSDS Telemetry Channel Coding, Recommendation 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]
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No. 79
THlS PAGE INTENTIONALLY LEFT BLANK.
Volume I11
CHAPTER 10. POINT-TO-MULTIPOINT
COMMUNICATIONS
10.1 SERVICE VIA SATELLITE
FOR THE DISSEMINATION OF
AERONAUTICAL INFORMATION
10.1.1 Point-temultipoint telecommunication service
via satellite to support the dissemination of aeronautical
information shall be based on full-time, non pre-emptible,
protected services as defined in the relevant CCITT
Recommendations.
10.2 SERVICE VIA SATELLITE
FOR THE DISSEMINATION
OF WAFS PRODUCTS
10.2.1 Recommendation.- System characteristics
should include the following:
a) frequency - C-bad, earth-to-satellite, 6 CHz band,
satellite-to-earth, 4 CHz band;
b) capacity with effective signalling rate of not less
than 9 600 bits/s;
c) bit error rates - better than I in id;
d) forward error corrt?ction; and
e) availability 99.95 per cent.
ANNEX 10 - VOLUME I11
7/11/96
No. 71
CHAPTER 11. HF DATA LINK
11.1 DEFINITIONS AND
SYSTEM CAPABILITIES
Note.- The following Standards and Recommended
Practices are specific to the high freguency data link (HFDL)
and are in addition to the requirements specified in the ITU
Radio Regulations (Appendix 27). The HFDL is a constituent
mobile subnetwork of the aeronautical telecommunication
nenvork (ATN), operating in the aeronaufical mobile (R) high
frequency band. In addition, the HFDL may provide non-ATN
functions, such as direct link service (DLS). The HFDL system
　
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