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Questions and Answers
What is the data rate of the T1 carrier?
What is the data rate of the T1 carrier?
- 3G
- 8 kHz
- 544 Mbps (correct)
- 64 Kbps
In digital transmission, how are phase distortion problems corrected?
In digital transmission, how are phase distortion problems corrected?
- By applying conditioning (correct)
- By using DSL
- By converting data to analog
- By using 8 kHz sampling rate
What does the public switched telephone network digitize your voice using?
What does the public switched telephone network digitize your voice using?
- 8 kHz sampling rate
- Analog-to-digital circuit (correct)
- 64 Kbps
- 3G
What is the continuous data rate produced by the 8 kHz sampling rate in the phone company's digitization process?
What is the continuous data rate produced by the 8 kHz sampling rate in the phone company's digitization process?
What is used to deal with the problem of echo in long analog lines?
What is used to deal with the problem of echo in long analog lines?
What begins the process of breaking up a digital data stream into packets or fragments of packets in packet switching?
What begins the process of breaking up a digital data stream into packets or fragments of packets in packet switching?
Which technology commands the lion’s share of technical attention according to the text?
Which technology commands the lion’s share of technical attention according to the text?
What is the process where a carrier's waveform is modified to contain data?
What is the process where a carrier's waveform is modified to contain data?
Which characteristic of a carrier can be modified in amplitude modulation?
Which characteristic of a carrier can be modified in amplitude modulation?
What type of modulation varies the carrier's frequency based on the amplitude of the modulating signal?
What type of modulation varies the carrier's frequency based on the amplitude of the modulating signal?
Which type of wave can be modeled using its fundamental frequency and odd harmonics?
Which type of wave can be modeled using its fundamental frequency and odd harmonics?
What do inductors and capacitors represent in wireline data transmission?
What do inductors and capacitors represent in wireline data transmission?
What kind of data encoding increases the data rate without requiring higher line signaling rates?
What kind of data encoding increases the data rate without requiring higher line signaling rates?
What process originated in the 1960s for long-distance data transmission?
What process originated in the 1960s for long-distance data transmission?
What is used as carriers in modulation due to their inability to be integrated or differentiated mathematically?
What is used as carriers in modulation due to their inability to be integrated or differentiated mathematically?
What is the term for the division of wireline modems into Bell1 and ITU2 classes?
What is the term for the division of wireline modems into Bell1 and ITU2 classes?
Which modern modem uses di-bit-encoded quaternary phase shift keying for noise advantages?
Which modern modem uses di-bit-encoded quaternary phase shift keying for noise advantages?
What do modem manufacturers offer in addition to data compression?
What do modem manufacturers offer in addition to data compression?
What does the chapter discuss about Wide Area Networks (WANs)?
What does the chapter discuss about Wide Area Networks (WANs)?
Why were wireline modems initially used even though they were slow?
Why were wireline modems initially used even though they were slow?
In the context of WANs, what does the Physical layer of the ISO OSI model provide?
In the context of WANs, what does the Physical layer of the ISO OSI model provide?
What is the purpose of modulation in electrical communications?
What is the purpose of modulation in electrical communications?
Why do LANs not normally run over a WAN?
Why do LANs not normally run over a WAN?
What is the primary reason for using one of the wide area technologies described in the chapter?
What is the primary reason for using one of the wide area technologies described in the chapter?
What is the main characteristic that has remained unchanged in WAN media despite changing business drivers and purposes?
What is the main characteristic that has remained unchanged in WAN media despite changing business drivers and purposes?
What is the function of demodulation in electrical communications?
What is the function of demodulation in electrical communications?
What is the typical speed for most fractional T1 lines?
What is the typical speed for most fractional T1 lines?
Which WAN technology is described as a fiber optic token-passing ring?
Which WAN technology is described as a fiber optic token-passing ring?
What technology is primarily a fiber optic transmission system and uses small transmission packets called cells?
What technology is primarily a fiber optic transmission system and uses small transmission packets called cells?
Which technology uses the same copper pairs that bring voicegrade wireline to residences or businesses?
Which technology uses the same copper pairs that bring voicegrade wireline to residences or businesses?
What is the data rate originally scheduled for Asynchronous Transfer Mode (ATM)?
What is the data rate originally scheduled for Asynchronous Transfer Mode (ATM)?
Which technology is described as suitable for highbandwidth applications like multisite video conferencing?
Which technology is described as suitable for highbandwidth applications like multisite video conferencing?
What are the typical speeds for the operation of MANs?
What are the typical speeds for the operation of MANs?
What does FDDI consist of?
What does FDDI consist of?
What is the most common speed for Fast Ethernet?
What is the most common speed for Fast Ethernet?
What WAN technology can be configured in differing topologies and is often used as a dual counter-rotating ring topology?
What WAN technology can be configured in differing topologies and is often used as a dual counter-rotating ring topology?
Which technology is considered a broadband technology allowing concurrent telephone, video, and data services on the line?
Which technology is considered a broadband technology allowing concurrent telephone, video, and data services on the line?
What are the various speeds at which ATM technology can operate?
What are the various speeds at which ATM technology can operate?
What is the main objective of ISDN?
What is the main objective of ISDN?
What is the main difference between connection-oriented and connectionless service?
What is the main difference between connection-oriented and connectionless service?
What is the purpose of the D channel in ISDN?
What is the purpose of the D channel in ISDN?
What technology is frame relay a connectionless version of?
What technology is frame relay a connectionless version of?
What type of data service does DDS (Dataphone Digital Service) offer?
What type of data service does DDS (Dataphone Digital Service) offer?
What is the main purpose of a T3 carrier?
What is the main purpose of a T3 carrier?
What is the technique used by the PAD in the packet-switching scheme provided by X.25?
What is the technique used by the PAD in the packet-switching scheme provided by X.25?
What type of traffic did ISDN achieve popularity for in the United States?
What type of traffic did ISDN achieve popularity for in the United States?
What does Frame Relay DDS provide?
What does Frame Relay DDS provide?
What is the maximum speed of Frame Relay?
What is the maximum speed of Frame Relay?
What does a T1 carrier multiplex onto one line?
What does a T1 carrier multiplex onto one line?
What was the original intention of ISDN's B channels?
What was the original intention of ISDN's B channels?
What is the purpose of the Microcom Networking Protocol (MNP)?
What is the purpose of the Microcom Networking Protocol (MNP)?
Which aspect of the V.42 standard contributes to data compression?
Which aspect of the V.42 standard contributes to data compression?
What is the primary function of modems according to the text?
What is the primary function of modems according to the text?
What was the basis for the discrete multi-tone process used in DSL lines?
What was the basis for the discrete multi-tone process used in DSL lines?
Which type of network does the Internet represent?
Which type of network does the Internet represent?
What is the function of MNPs 3 through 5 according to the text?
What is the function of MNPs 3 through 5 according to the text?
What is the proprietary domain status of MNPs 6 through 10?
What is the proprietary domain status of MNPs 6 through 10?
What is the role of modems in operating over a typical telephone wireline?
What is the role of modems in operating over a typical telephone wireline?
Which modern modem feature is concerned with packetizing data?
Which modern modem feature is concerned with packetizing data?
(V.42) employs which frame and technique to perform data compression?
(V.42) employs which frame and technique to perform data compression?
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Study Notes
- The text discusses various modulation techniques used in data communications.
- Wireline data transmission is often perceived as instantaneous due to short lengths of wire and effects like turning on car headlights.
- However, long lengths of wire introduce inductance and capacitance, affecting the transmitted signal.
- Inductors and capacitors are represented by lumped schematic symbols.
- A square wave can be modeled using its fundamental frequency and odd harmonics.
- Sine waves are used as carriers due to their inability to be integrated or differentiated mathematically.
- Modulation is the process where a carrier's waveform is modified to contain data.
- Amplitude, frequency, and phase are the three characteristics of a carrier that can be modified.
- Amplitude modulation changes the carrier's amplitude according to the data signal.
- Frequency modulation varies the carrier's frequency based on the amplitude of the modulating signal.
- Phase modulation shifts the carrier's phase according to the modulating signal's amplitude.
- Data can be encoded to increase the data rate without requiring higher line signaling rates.
- Serial modems originated in the 1960s for long-distance data transmission.
- Wireline modems are divided into Bell1 and ITU2 classes.
- Modern modems use Link Access Protocol and can be synchronous or asynchronous.
- Bell 212 modem uses di-bit-encoded quaternary phase shift keying for noise advantages.
- Modem manufacturers offer different data compression and error detection/correction schemes.
- Through repetitive data encoding, data compression increases throughput.
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