Podcast
Questions and Answers
What is the main function of the physical layer in a network?
What is the main function of the physical layer in a network?
What does FDM stand for in the context of circuits?
What does FDM stand for in the context of circuits?
In the context of network circuits, what does a T-1 connection refer to?
In the context of network circuits, what does a T-1 connection refer to?
What is the purpose of modems in analog transmission of digital data?
What is the purpose of modems in analog transmission of digital data?
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What is the approximate size of a multimode optical fiber core?
What is the approximate size of a multimode optical fiber core?
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What type of transmission does a single mode optical fiber use?
What type of transmission does a single mode optical fiber use?
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What type of wireless transmission is subject to interference from heavy rain, smog, and fog?
What type of wireless transmission is subject to interference from heavy rain, smog, and fog?
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What type of radio communication requires line-of-sight and is often used for long distance, terrestrial transmissions?
What type of radio communication requires line-of-sight and is often used for long distance, terrestrial transmissions?
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Which of the following factors is used in media selection?
Which of the following factors is used in media selection?
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Which code is used to represent letters, numbers, and symbols in a message on PC computers?
Which code is used to represent letters, numbers, and symbols in a message on PC computers?
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Which transmission mode sends bit by bit over a single wire?
Which transmission mode sends bit by bit over a single wire?
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What type of signaling defines how the voltage levels correspond to the bit values of 0 or 1?
What type of signaling defines how the voltage levels correspond to the bit values of 0 or 1?
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Which digital transmission type defines a bit value by a mid-bit transition?
Which digital transmission type defines a bit value by a mid-bit transition?
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What type of transmission is used in local loop phone lines to connect PCs to the Internet?
What type of transmission is used in local loop phone lines to connect PCs to the Internet?
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What technology is used to enable voice communications between two telephones over POTS?
What technology is used to enable voice communications between two telephones over POTS?
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Which characteristic of sound waves refers to the number of waves that pass in a second?
Which characteristic of sound waves refers to the number of waves that pass in a second?
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What is the main advantage of digital transmission over analog transmission?
What is the main advantage of digital transmission over analog transmission?
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In a point-to-point configuration, why does each computer have its own circuit to reach the other computer in the network?
In a point-to-point configuration, why does each computer have its own circuit to reach the other computer in the network?
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Which type of data flow moves in both directions at the same time?
Which type of data flow moves in both directions at the same time?
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In which data flow method does data flow in one direction only?
In which data flow method does data flow in one direction only?
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Which type of multiplexing requires guardbands to prevent interference between channels?
Which type of multiplexing requires guardbands to prevent interference between channels?
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How does time division multiplexing (TDM) divide up the circuit?
How does time division multiplexing (TDM) divide up the circuit?
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What is the main advantage of statistical time division multiplexing (STDM) over traditional TDM?
What is the main advantage of statistical time division multiplexing (STDM) over traditional TDM?
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What does Inverse Multiplexing (IMUX) do?
What does Inverse Multiplexing (IMUX) do?
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How does Frequency Division Multiplexing (FDM) create smaller channels from a larger frequency band?
How does Frequency Division Multiplexing (FDM) create smaller channels from a larger frequency band?
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Which type of configuration is used when many computers are connected on the same circuit?
Which type of configuration is used when many computers are connected on the same circuit?
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What is a key advantage of digital transmission in terms of error detection and correction?
What is a key advantage of digital transmission in terms of error detection and correction?
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Study Notes
Physical Layer Functions
- Facilitates the transmission and reception of raw bitstreams over a physical medium.
- Responsible for signaling, data rate, and physical network topology.
FDM
- Stands for Frequency Division Multiplexing.
- Technique used in circuits to divide multiple signals across a frequency band.
T-1 Connection
- Refers to a dedicated digital transmission line that carries data at a rate of 1.544 Mbps.
Modems
- Convert digital data into analog signals for transmission over phone lines.
- Enable communication by modulating and demodulating data.
Multimode Optical Fiber Core Size
- Typically has a core diameter of around 50 to 62.5 micrometers.
Single Mode Optical Fiber
- Uses a single light mode for transmission, allowing for longer distance communication and higher bandwidth.
Wireless Transmission Interference
- Transmission subject to interference from heavy rain, smog, and fog typically involves microwave signals.
Radio Communication
- Requires line-of-sight and is often utilized for long-distance terrestrial transmissions, such as microwave communication.
Media Selection Factors
- Considerations include cost, bandwidth, distance, and environment.
PC Code Representation
- ASCII (American Standard Code for Information Interchange) is used to represent letters, numbers, and symbols.
Transmission Mode
- Serial transmission sends data bit by bit over a single wire.
Signaling Method
- Defines how voltage levels correspond to binary values (0 or 1) through signaling techniques.
Digital Transmission Type
- Defines bit value using mid-bit transitions, often utilized in differential signaling.
Local Loop Phone Lines
- Used for digital subscriber line (DSL) connections to connect PCs to the Internet.
Voice Communication Technology
- POTS (Plain Old Telephone Service) enables voice communications between telephones.
Sound Waves Characteristic
- Frequency refers to the number of waves that pass in a second, measured in Hertz (Hz).
Digital vs Analog Transmission
- Main advantage of digital transmission includes better noise resistance and improved error correction capabilities.
Point-to-Point Configuration
- Each computer has its own circuit to ensure dedicated communication without interference.
Data Flow Types
- Full-duplex data flow allows simultaneous two-way communication.
- Simplex data flow permits communication in one direction only.
Multiplexing Types
- Frequency Division Multiplexing requires guardbands to prevent channel interference.
Time Division Multiplexing (TDM)
- Divides a circuit into time slots allocated to multiple signals for sequential transmission.
Statistical Time Division Multiplexing (STDM)
- Advantageous as it adapts to varying data rates, more efficiently using bandwidth compared to traditional TDM.
Inverse Multiplexing (IMUX)
- Distributes data over multiple channels to increase bandwidth for transmission.
Frequency Division Multiplexing (FDM) Process
- Divides a larger frequency band into smaller channels, allowing simultaneous transmission of different signals.
Configuration for Multiple Computers
- Bus or a star configuration is often used when many computers connect on the same circuit.
Digital Transmission Error Handling
- Key advantage includes robust error detection and correction mechanisms, enhancing data integrity during transmission.
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Description
Test your knowledge on circuits configuration, data flow, multiplexing, communication media, and digital transmission as outlined in Chapter 3 of the 9th Edition of 'Business Data Communications and Networking' by Jerry Fitzgerald and Alan Dennis.