Other Stuff I Missed

Question 1

What are the three types of Classical Ciphers?

Answer 1

Transposition
Substitution
Product

Question 2

What are the two types of Modern Ciphers?

Answer 2

Block
Stream

Question 3

Answer 3

Question 4

TDR Open Circuit V-t diagram

Answer 4

Question 5

TDR Short Circuit V-t diagram

Answer 5

Question 6

TDR Resistive Load V-t diagram

Answer 6

Question 7

TDR Parallel RC load V-t diagram

Answer 7

Question 8

What are three main factors for determining the type of orbit?

Answer 8

Alititude
Orbital period
Inclination

Question 9

How does a Molniya orbit affect the coverage of a satellite?

Answer 9

Allows the satellite to spend more time over a specific area of highest apogee. It also allows higher orbits which provide greater coverage.

Question 10

What is the most common orbit for communication satellites and why?

Answer 10

GEOstationary orbit because it allows them to remain fixed over a position for consistent coverage.

Question 11

Why is there a restriction on frequencies used by satellite systems?

Answer 11

Prevent inteference between different satellite systems.

Question 12

What is COMMPLAN

Answer 12

Describes comms strateg6y, protocols, procedures to be employed.

Question 13

Describe two technological developments related to telephone exchanges

Answer 13

Digital switching - converting to digital data
Electronic switching - evolution from manual switching, allowed complex networks

Question 14

Why would a home satellite television dish not require an Antenna Controller Unit

Answer 14

Connects to GEO satellites

Question 15

What frequency range for satellites and why

Answer 15

1-40 GHz because lower frequencies can penetrate atmospheric layers with less attenuation but higher frequencies can carry greater bandwidth.

Question 16

What are 4 basic types of telephone exchanges

Answer 16

Local exchange - First point of contact for local users

Tandem Exchange - Connect local exchanges to eachother

Toll Exchange - Long distance calls between countries or cities

International Gateway Exchange - International calls

Question 17

What is Quality of Service and 4 components

Answer 17

Performance of a communications network in terms of

Bandwidth
Latency
Jitter
Error

Question 18

What are 5 frequency bands for radio communications

Answer 18

VHF
UHF
HF
SHF
EHF

Question 19

What type of polarization is used for Satellite Communications and why?

Answer 19

Circular because it is not as reliant on receiver and transmitter orientation.

Question 20

What is receiver sensitivity. If you had a receiver with -100dB and with -75dB, which would you use and why.

Answer 20

The minimum input signal pwoer required for the receiver.

You would use the -75dB receiver.

Question 21

What is a leased line?

Answer 21

A dedicated line that provides constant, fixed BW connections.

Question 22

What is a PSTN line?

Answer 22

Public Switched Telephone Network.

Shared network that routes calls through switches. Subject to variable traffic.

Question 23

What is a mixer in a Direct Conversion Receiver. Also what is a Direct Conversion Receiver

Answer 23

DCR is also known as a homodyne receiver. Similary to superheterodyne except it converts incoming RF directly to baseband without an intermediate frequency. This allows a simpler receiver design but less flexible.

The mixer is the component that actually mixes the two frequencies to produce the baseband.

Question 24

Answer 24

Question 25

Amplifier:

Answer 25

Extend signal beyond normal attenuated range and maintain clarity.

Question 26

Patch Panel System

Answer 26

Dedicated routing architecture which links the switch to end points.

Question 27

Router

Answer 27

Directs data packets between compter networks and works on the IP level.

Question 28

Answer 28

Question 29

Name two basic Antenna Types

Answer 29

Yagi Udi
Dipole.
Monopole

Question 30

What is latency?

Answer 30

The amount of time for the data packet to reach its destination.

Question 31

Answer 31

Question 32

Answer 32