Link 16

Front 1

• Contention Access

Back 1

a group of timeslots give to multiple units to transmit in using the same crypto and net number so there can be more than one transmission in a timeslot. Receivers will hear the closest transmitter. Simulations transmissions don’t cause interference Two types Operator (Push to talk and Operator action) and Machine Controlled

Front 2

• Dedicated

Back 2

provides guaranteed delivery, most common, used for many different types, a group of timeslots is assigned to specific unit for their xmsn.

Front 3

• Timeslot Reallocation

Back 3

platforms dynamically share surveillance capacity based on track loading, limited to NPG 7 survellience, operates in centralized or decentralized mode. Max total capacity is 60%, reduced to 22% when not receiving requests.
Three requirements TSR capable JTIDS/MIDS terminal, host software and network, p368

Front 4

• Stacked Net

Back 4

uses a common set of timeslots for the same NPG but differentiated by net number(hopping pattern), operator-selectable net # (0-126) 127 possible nets, NPG 9,12, 13, 19-20 pseudo stacked, operator selectable

Front 5

• Multi Net

Back 5

exchange info using diff NPGs, same time timeslots, different net number, not operator selectable, Used to increase bandwidth

Front 6

Dedicated Time Slot Reuse

Back 6

Two or more platforms with same timeslot, dedicated timeslot reuse is a form of contention however geographically separated. no requirement to directly exchange information, and no common receiver needs info from both

Front 7

3 Requirements for direct connectivity

Back 7

LOS, sufficient signal strength and signal propagation

Front 8

Understand the option sequence:

Back 8

“TRS Option pool” found in NDD, relates directly to the number of total tracks a participant is allocated. 128 total tracks based upon plan or actual participants. P574

Front 9

TSEC (transmission security

Back 9

crypto variable pseudo-randomly selects frequency for each pulse, encrypts transmissions. JUs can’t receive Link16 xmsn w/out the proper TSEC cryptovariable loaded

Front 10

MSEC (message security)-

Back 10

crypto variable used to encrypt/decrypt message data

Front 11

RELGRID

Back 11

Primary Navigation Controller must be assign and same grid origin must be assigned,

Front 12

GEO GRID

Back 12

is referenced to WGS-84 latitude, longitude, and altitude

Front 13

Position Reference

Back 13

provides increased positional accuracy for units performing geodetic grid RELNAV

Front 14

Largest Unit of time?

Back 14

Epoch 12.8 minutes, long 98,324 timeslots in one epoch

Front 15

Basic Unit of time?

Back 15

Frame is the basic recurring unit of time, 64 frames in one epoch, 12 seconds long (+/- 6sec) 1536 timeslots in one frame p335

Front 16

Timeslot

Back 16

is a unit of access

Front 17

Other Times

Back 17

timeslots can have 72(RTTs), 258 or 444 pulses in one timeslot, one timeslot is 7.8 mirco seconds in duration

396,288 = 1536 timeslots x 258 pulses

Front 18

Packing Structures Pulses 6.4/6.6 micro seconds

Back 18

amount of pulses in each packing structure synch/header, data, propagation

Front 19

Standard Double Pulse

Back 19

258 Most Anti-Jam 3 J-words (less through put)

Front 20

Pack 2 Single Pulse

Back 20

258 Some anti jam 6 J-words

Front 21

Pack 2 Double Pulse

Back 21

444 more data 6 J-words

Front 22

Pack 4 Single Pulse:

Back 22

444 Least Anti Jam 12 J-words

Front 23

Coarse Sync to Fine Sync

Back 23

(you have to send 3 RTT-I’s) 3 RTT-R are needed to go to fine synch. To get to coarse sync you need valid error free initial entry message (IEM)

Front 24

MIDS vs JTIDS p317
MIDS, TACAN J-voice

Back 24

no info other than pg number

Front 25

JTIDS

Back 25

older version, provides secure, jamming resistant communications, navigation, and identification functions to airborne and surface based subscribers. Designed for larger platforms,principally C2 A/C, mobile ground units and ships

Front 26

Understand what you are allowed and no allowed to do with offsets? P418

Back 26

You can go to a standard network time offset to a forward (+60 in 5min intervals)
Not allowed to go to a forward time offset to a standard time offset until the difference in time is zero.

Front 27

Preferred Method to de-conflict?

Back 27

Crypto (geographic separation),

Front 28

NPG 1

Back 28

Initial Entry Message

Front 29

NPG 4

Back 29

Network Management

Front 30

NPG 6

Back 30

PPLI-B Precision Participant Location Identifier-bit

Front 31

NPG 7

Back 31

Surveillance

Front 32

NPG 8

Back 32

Mission Management

Front 33

NPG 9

Back 33

Air Control (uplink)

Front 34

NPG 10

Back 34

Electronic Warfare

Front 35

NPG 11

Back 35

Imagery

Front 36

NPG 12

Back 36

Voice Group A

Front 37

NPG 13

Back 37

Voice Group B

Front 38

NPG 19

Back 38

FTR 2 FTR (advisory and targeting)

Front 39

NPG 20

Back 39

NC2-NC2 FTR 2 FTR

Front 40

NPG 29

Back 40

Residual Text Message

Front 41

Types of Networks

Back 41

System Time Reference Network- uses Network Time Reference, only one NTR allowed (other wised have fragmentation)
External Time Reference Network- external time source, such as GPS, multiple NTREs allowed
Mixed Network- getting your system time from someone else who is getting their system time from GPS

Front 42

Types of Relay p393

Back 42

Conditional- selectively activate or deactivate relay function based on which JU can provide most effective coverage(geographic)
Un-Conditional- terminal will always relay unless not in fine synch or silent
Flood- is a multiple unconditional relay, any timeslot designate for relay is relayed by all for units out of LOS.
Zoom- selective timeslots on one net can be relayed onto another net.
Multi-Hop Relay- no used, original message is transmitted in timeslot and 6 to 31 timeslots later is relayed and transmitted again

Front 43

J-Message

Back 43

J-Series Messages found in MIL-STD-6016 32 categories and 8 sub-categories (Labeled from J0.X to J31.X). Language of Link 16, made up one or more J words, 256 possible messages, but only 109 are currently defined. Each J-Series Message J-Words, three types: Initial, Extension and Continuation (I,E, and C) each word is 70 information bits and five parity bits. J words made up of data elements which consist of DFIs Data field ID and DUIs Data Use ID

Front 44

J2.X=Precise Participant Location Identification (PPLI) most important messages identify platform as friendly w/ location various platform characteristics
J2.0 Indirect Interface Unit PPLI: special type PPLI rep. platforms not directly participating in the JTIDS/MIDS i.e. (11/11B pu/ru’s) or Link 16 Jus being fwd from a different network
J2.2 Air PPLI: Airborne C2 and non-C2
J2.3Surface PPLI: Surface Maritime platforms
J2.4 Subsurface PPLI, not typically used
J2.5 Land Point PPLI: transmitted by stationary land platforms such as the TAOC or Patriot ICC
J2.6 Land Track PPLI: mobile land platforms

Back 44

Just study the front.

Front 45

J3.X Surveillance information is reported by C2Jus in NPG7 using J3.X messages (large portion 16 network.
J3.0 Reference Point: used to represent many things. Point/line/area descriptor, point type, point amplification (TBMs) launch an impact point, CAPs, Anti-Subsurface (ASW) locations
J3.1 Emergency Point
J3.2 Air Track
J3.3 Surface Track
J3.4 Subsurface Track
J3.5 Land Point or Track
J3.6 Space Track
J3.7 Electronic Warfare Production Information

Back 45

Just fill in the front.

Front 46

JREAP A- (Satellite

Back 46

half duplex units take turns, key role of the JREAP A is the JRE-NC (network controller). NC specifies a list of units with permission to transmit. Determines the network time reference NTR. (Throughput 2400bps normal/4800/9600bps)

Front 47

JREAP B- (Phone)

Back 47

Asynchronous and synchronous full duplex point to point mode, uses land line, highly dependent on phone line (Throughput 300-115,200bps)

Front 48

JREAP C-(internet: TCP/UDP)

Back 48

LAN/WAN local Area Network/Wide Area Network, must be a Server=Master and Client

Front 49

Pulse De-confliction

Back 49

Ref on how to deal with it- Pulse deconfliction server register

Front 50

Network Management System

Back 50

Network IER define, Network design, Network Planning, Network Initialization, and Network Ops

Front 51

Two Outputs of the Network Design

Back 51

NDD- Network Description Document
IDL- Initialization Data Load

Front 52

Output of the Network Planning

Back 52

Creates the OPTASK