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U-28 TDL Test > Link/SADL > Flashcards

Link/SADL Flashcards

(21 cards)

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1
Q

Describe characteristics of SADL net shape and net position.

A

Net Shape: 4/4

Digit 1: number of flights in the Air Key (1 to 4)

Digit 2: number of aircraft per flight (1 to 4)

Net Position: 4/2

Digit 1: flight # that ownship is in (1 to 4)

Digit 2: ownship’s position in the flight (1 to 4)

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2
Q

What network position does the timing master have to be?

A

11 aircraft is the timing master

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3
Q

How big of an air key network can you form?

A

80 aircraft

16 players in 5 possible networks. (16*5) = 80 aircraft

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4
Q

What are the characteristics of the guard and the secondary channel?

A

Guard Channel - Frequency that the receiver tunes its antenna to for receiving network entry messages

Secondary Channel - Defines the range of frequencies over which the RT will hop

I.E. CH 33 - tunes to Chl 3 and hops only on Chl 3

I.E. CH 37 - tunes to Chl 3 and hops to Chl 7

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5
Q

What SADL to SADL messages can you transfer?
List three.

A

SADL to SADL Message Set

  • J2.x - PPLI (SA)
  • J12.0 - Mission assignment
  • J12.6 - Target Sorting
  • J13.2 - Platform Status
  • J28.2 - Text Messaging
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6
Q

What are the four power levels of the EPLRS Radio and the normal power range?

A

Four Power Levels

  1. Low - .4 Watts
  2. Medium Low - 3 Watts
  3. Medium High - 20 Watts
  4. High - 100 Watts

Medium High (20 Watts) is the normal operating power.

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7
Q

Define Net Type: SADL Gateway

A

Gateway:

  • Allows forwarding of SADL information onto a LINK 16 network and vice versa
  • Specific GAT key is required for a specific Gateway
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8
Q

Describe the 6 differences between dedicated and contention access.

A

Dedicated access:

  1. Participants assigned specific and unique transmit time slots
  2. All other participants are programed to rx only during those time slots
  3. One unit per time slot: no transmission conflicts

Contention access:

  1. Common tx time slots are shared amongst several terminals in the same group
  2. Other terminals only hear the closest transmitter
  3. Users select slots at random, based on assigned rate
  4. Multiple transmitters, same time slot, same crypto
  5. Operator controlled contention access: PTT: J-Voice (NPG 12/13)
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9
Q

List the 3 requirements to Link 16 network entry

A

NTR/ETR

Correctly loaded crypto

IDL

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10
Q

What is the maximum practical LOS of Link 16

A

Air - Air: 300 NM (normal) 500 NM (extended)

Surface - Air: 150 NM

Surface - Surface: 25 NM

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11
Q

List 5 current Link 16 platforms

A
  1. RC-135
  2. E-8
  3. E-3
  4. F-15E
  5. FA-18
  6. U-28
  7. F-22 (rx only)
  8. B-2
  9. F-15C
  10. F-16 (most blocks)
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12
Q

List the total number of j-series messages, number of categories, and subcategories

A

256, 32, 8

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13
Q

How many stacked nets can exist in a link 16 net?

A

127

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14
Q

List 4 characteristics that define NPGs

A
  1. Building blocks of the link 16 network
  2. Support specific functions and exchange of specific j-series messages
  3. Time slots are allocated to different NPGs
  4. defined by participants, functions, and access modes
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15
Q

What is the title and purpose of a J12.6 series message?

A

Title: Target sorting

Purpose:

  • Non C2 JU’s pass target and targeting information among themselves
  • Pass sensor data
  • Pass non C2 JU engagement status info
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16
Q

What are the NPG 19/20 function, participants and access?

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A

Function:

  • Exchange of fighter derived target and engagement information

Participants

  • Non C2 JUs, some C2 JUs RX only

Access

  • Contention
17
Q

What is the Link 16 frequency range boundaries?

Study These Flashcards
A

960 MHz to 1215 MHz

18
Q

What are the characteristics of Link 16 frequency agility? Name three.

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A
  • Frequency hops among 51 frequencies spaced 3 MHz apart
  • Transmission frequency changes after each 6.4 µsec pulse
  • Hop rate in excess of 70 000 hops per sec
  • Pseudorandom hop pattern is based on net numbers (0 to 127)
  • Hopping provides protection against jammers
19
Q

What are the seven things contained in the OPTASKLINK?

Study These Flashcards
A
  • Contains network operating period
  • duties
  • crypto assignments
  • TN block assignments
  • time base (NTR assignments)
  • unit addresses
  • terminal procedures
20
Q

What time quality does the NTR have?

Study These Flashcards
A
  • 15 (best available)
21
Q

Describe 3 different sync states of NET entry:

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A

No Sync:

  • Have not entered any IEM (Initial Entry Messages)

Coarse Sync:

  • Two IEM have been received
  • Terminal is capable of receiving messages only

Fine Sync:

  • Three RTT (round trip timing) have been exchanged
  • Terminal is now full receive and transmit

U-28 TDL Test (1 decks)

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