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EWOK > Day 2: Sat Networks > Flashcards

Day 2: Sat Networks Flashcards

1
Q

System of communication satellites in space to facilitate various forms of communication (voice, data, video)

A

Satellite Networks

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2
Q

What are the four applications of satellite networks?

A
  • Telecommunications
  • Broadcasting
  • Internet
  • GPS
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3
Q

Relies on stationary ground equipment at predetermined locations; point-to-point and point-to-multipoint comms (ex=VSATS)

A

Fixed Satellite Service (FSS)

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4
Q

Distribution of TV, radio, etc via satellite to a wide audience (fan-out); stands out for high transmission power

A

Broadcasting Satellite Service/Direct Broadcast Service (BSS/DBS)

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5
Q

Employs transportable receiver and transmitter equipment; provides voice, data, and messaging services to land, maritime, remote environments

A

Mobile Satellite Services (MSS)

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6
Q

Fixed Satellite Service (FSS) Common Bands

A

C, Ku, Ka

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7
Q

Broadcasting Satellite Service/Direct Broadcast Service (BSS/DBS) Common Bands

A

C, Ku, Ka

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8
Q

Mobile Satellite Services (MSS) Common Bands

A

L, S, C

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9
Q

VSAT stands for?

A

Very Small Aperture Terminal

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10
Q

VSATs utilize ______ dish antennas to transmit and receive data via satellite

A

Small

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11
Q

Enables _______ comms between ______ _________ and a _______ ___, typically located at a network operations center or data center

A

two-way
remote locations
central hub

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12
Q

What kind of solution is for connecting remote locations to broader comm infrastructure?

A

Versatile and reliable

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13
Q

What are VSAT applications?

A
  • Internet
  • Telecomms
  • Broadcasting
  • Military
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14
Q

Biggest advantages of VSAT

A

Easy to install and inexpensive to operate

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15
Q

VSAT Common Bands

A

C, Ku, Ka

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16
Q

Wider coverage (suitable for global comms); less signal degradation due to rain/atmosphere

A

C-Band Advantage

17
Q

Limited BW availability compared to higher frequency bands, lower data transmission rates

A

C-Band Disadvantage

18
Q

Higher data transmission rates compared to C, so suitable for higher BW applications

A

Ku-Band Advantage

19
Q

More susceptible to rain attenuation, smaller coverage area because more susceptible to atm absorption

A

Ku-Band Disadvantage

20
Q

Higher bandwidth, enabling very high data transmission rates; allows for the use of smaller antennas, making it more suitable for mobile and broadband applications

A

Ka-Band Advantage

21
Q

Highly susceptible to rain attenuation, and easily absorbed by atmospheric gases, limiting their effective range and coverage area

A

Ka-Band Disadvantage

22
Q

What are the 4 segments of VSAT network?

A
  • Ground Station
  • RF Links
  • Satellite
  • Users
23
Q

Requires constant communication with VSAT ground station to pass data between nodes and cannot communicate directly with other nodes

A

Star

24
Q

Nodes can communicate directly with other nodes within the VSAT network but still require a master control station to ensure timing and access to the network is maintained

A

Mesh

25
Q

Mix of star and mesh that allows the hub to send information to the remote components

A

Hybrid

26
Q

What is AUPC?

A

Automatic Uplink Power Control

27
Q

What is the first step of Automatic Uplink Power Control (AUPC)?

A

Remote station receives signal and demodulates

28
Q

What is the second and third step of Automatic Uplink Power Control (AUPC)?

A

Remote station demodulator identifies Eb/No beyond lower threshold, and
Requests an increase in power using reserved bytes in overhead structure

29
Q

What is the fourth step of Automatic Uplink Power Control (AUPC)?

A

Local MODEM adjusts output power level to attempt to maintain the Eb/No at the remote MODEM

30
Q

What is the ALC?

A

Automatic Leveling Control

31
Q

What does the Automatic Leveling Control (ALC) do?

A

Automatically changes the power in the individual channels on the transponder in the channelizer to overcome interference

32
Q

When the receive signal level drops below a certain SNR, the individual downlink or uplink subchannel will boost power

A

Automatic Leveling Control (ALC)

33
Q

If the power is too high, what will lower the power to meet the average SNR threshold?

A

Automatic Leveling Control (ALC)

34
Q

What is the ACM?

A

Adaptive Code Modulation

35
Q

When the signal reaches the receiving modem and drops below a certain threshold, the receiving modem will send a burst to the transmitting modem to change to a more robust MODCOD to mitigate interference

A

Adaptive Code Modulation (ACM)

36
Q

What is MODCOD?

A
  • Mod - Modulation Scheme
  • COD - FEC

EWOK (22 decks)

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