1. INTRODUCTION TO JTIDS/MIDS LINK 16
IDLS 2003

2. TERMINOLOGY JTIDS MIDS Joint Tactical Information Distribution System
Multifunctional
Information Distribution System
INFORMATION - sensors, navigation, status, commands, vectors, position
DISTRIBUTION - via Link-16
SYSTEM - Platforms joined in a tactical environment
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C.1.2

3. TERMINOLOGY
JTIDS/MIDS refers to the communications equipment necessary to exchange Link 16 messages
This includes:
Terminal hardware and software
RF equipment
Resulting waveform generated
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4. ENVIRONMENTS
Air
Surface
Subsurface
Land
Space
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5. IJMS Interim JTIDS Message Standard Bases on Link 11 M-Series messages
Adapted to utilise basic JTIDS architecture
Class 1 or Bilingual Terminals
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6. LINK 16 256 combinations of label and sub-label
Message standard (STANAG 5516)
256 combinations of label and sub-label
Link 16 messages support:
Surveillance
Network Management
Control EW
Voice
Free text messaging
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7. TECHNICAL CHARACTERISTICS
L Band UHF
51 Frequencies
969 to Mhz Intervals
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8. TACAN / DME Channels spaced every 1 MHz
IFF Filters
14 Frequencies
5 Freq’s
32 Frequencies
960
1030
1090
1215
TACAN / DME Channels spaced every 1 MHz
969
1206
Link-16 Frequencies spaced every 3 MHz (51 Frequencies)
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9. ARCHITECTURE JTIDS/MIDS Link-16 is a data link that is: Real Time
Secure
ECM Resistant
High Capacity
Non-Nodal
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10. ARCHITECTURE Broadcast type system No critical nodes
each unit can receive directly from all other assigned units
No critical nodes
if one terminal goes down, the network is not crippled
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11. ARCHITECTURE Time Division Multiple Access (TDMA)
Time is divided into 128 time slots per second
Each terminal can either transmit or receive
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12. EPOCH = 64 FRAMES EPOCH = 12.8 mins = 98304 DAY (24 Hours) Timeslots
= EPOCHS
EPOCH =
64 FRAMES
1 FRAME =
12 Seconds
FRAME =
1536 Timeslots
1Timeslot = ms
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13. ARCHITECTURE
Each time slot is allocated to a specific user for transmission. All other users receive in that time slot.
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14. TIMESLOT Timeslot equates to 7.8125msec 1536 timeslots in 12 seconds
Timeslot comprises several components
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15. TIMESLOT Number of elements within a timeslot Jitter Synchronisation
Time refinement
Message header and data
Propagation
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16. TIME SLOT STRUCTURE
Jitter - variable time delay in the start of a transmission of a time slot; standard double pulse and packed-2 single pulse message packing structures
SYNC
JITTER
HEADER
DATA
PROPAGATION
milliseconds
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17. TIME SLOT STRUCTURE
Synchronization - a pattern of pulses that allows the receiving terminal to synchronize to the transmission
JITTER
SYNC
HEADER
DATA
PROPAGATION
milliseconds
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18. TIME SLOT STRUCTURE
Time Refinement - used for Class 1 compatibility only
JITTER
SYNC
HEADER
DATA
PROPAGATION
milliseconds
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19. TIME SLOT STRUCTURE
Header - 35 bit word providing information concerning the message(s) transmitted in the time slot
JITTER
SYNC
HEADER
DATA
PROPAGATION
milliseconds
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20. TIME SLOT STRUCTURE Data - message(s) transmitted in the time slot;
3, 6, or 12 TADIL J words, depending on packing structure
JITTER
SYNC
HEADER
DATA
PROPAGATION
milliseconds
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21. TIME SLOT STRUCTURE
Propagation - time period to allow the signal to propagate to 300 or 500 NM prior to start of next time slot
JITTER
SYNC
HEADER
DATA
PROPAGATION
milliseconds
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22. TIMESLOT Header and Data Link 16 message words taken in groups of:
3 words (Std)
6 Words (P2)
12 Words (P4)
Header specifies:
Message Type
Coding
Packing |Structure
Source terminal
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23. STANDARD PACKING STRUCTURE
TIME SLOT
MILLISECONDS S TR H
DATA
PROPAGATION
JITTER
3.354 MILLISECONDS
MILLISECONDS
MINUS JITTER
S = SYNCHRONISATION
TR = TIME REFINEMENT
H = HEADER
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24. ACCESS METHODS Dedicated Contention Time slot re-allocation
Guaranteed reception
Inflexible
Contention
Flexible
Reception uncertainty
Time slot re-allocation
Shared Pool
Unit requests share
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25. ECM RESISTANCE Double Pulse Jitter Frequency Hopping
Crypto variable Encoding
Message Preparation
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26. SECURITY Message Security (MSEC) Transmission Security (TSEC)
Common Variable Mode
Partitioned variable mode
Auto rollover
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27. MESSAGE PREPARATION Message Packets Reed-Solomon encoding Interleaving
All J-Series Fixed Format words
Interleaving
CCSK
Random Noise
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28. NETWORK ENTRY Network Time Reference (NTR)
First Platform in net
Transmits Initial Entry Message (IEM) every 12 seconds
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29. NETWORK ENTRY Platform other than NTR required to synchronise
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30. NET ENTRY Time Slots belonging to Net Entry Time Slot Block A-0-6
Time error to within propagation time (clock correction)
Estimate of current system time
Estimate of time of next entry time slot
Time uncertainty
Time Slots belonging to Net Entry Time Slot Block A-0-6
Coarse Synchronization will take place using this time slot
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31. FINE SYNCHRONISATION Actively or passively Actively
Passively utilising received PPLI’s
Actively
RTT(A) or RTT(B)
RTT (A) Dedicated
RTT (B) Contention
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32. MULTINETTING
JTIDS provides the capability to operate simultaneously in up to 127 nets in the same network
A terminal can operate (transmit or receive) in only one net in any one time slot but can operate in any net in any time slot as determined by assignment
These nets use independent frequency hopping patterns with the net number a variable in determining the hopping pattern
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33. MULTINETTING
NET 127
NET ...
NET 2
NET 1
NET 0
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34. NETWORK PARTICIPATION GROUPS
Previous links, data received and processed if applicable to a platforms role or not
NPG’s allow for grouping of J-series messages into a functional role
Aids network design
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35. NPG’s 13 VOICE GROUP B 19 NON-C2 TO NON-C2 20 NON-C2 TO NON-C2 21 BMD
22 COMPOSITE A
23 COMPOSITE B
27 JOINT NET PPLI
29 RESIDUAL
30 IJMS POSITION & STATUS
31 OTHER IJMS DATA
1 INITIAL ENTRY
2 RTT-A
3 RTT-B
4 NETWORK MANAGEMENT
5 PPLI & STATUS GROUP A
6 PPLI & STATUS GROUP B
7 SURVEILLANCE
8 MISSION MANAGEMENT
9 CONTROL
10 ELECTRONIC WARFARE
12 VOICE GROUP A
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36. RELAY
UHF LOS Only
Paired Slot relay
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37. RELAY X Y X Originator Tx in T/S (X) Paired Slots Re-Tx for second HopB0 C0 A1 B1 C1 A2 B2 C2 A3 B3 C3 A4 B4 C4 A5 Y
The relay platform will re-Tx in the timeslot controlled by the relay delay (6-31). Y is the re-Tx slot, with a relay delay of 6 timeslots X
Re-Tx for second Hop
by additional relay platform
The relay terminal Rx in (X)
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38. RELAY Fixed Format and free text Capable of relaying to different nets
No limit to relay hops
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39. UK PLATFORMS In Service Future E3D Tornado F3
Nimrod (R) VC10 & Tristar
JAPNMS (NMGB) C130
JPC TJF
RN (CVS & T42) RN (JPC)
GRAP (RA & 16 AAB)
Future
EFA Typhoon ASTOR
MRA (4) T45
GBAD
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40. OTHER NATIONS USA (USAF, USN, USMC, US Army) France Germany
Italy Netherlands
Norway Belgium
Denmark Spain
Canada Australia
Switzerland Japan
and others
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41. ANY QUESTIONS
IDLS 2003