Telecommunications Fundamentals Quiz

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Questions and Answers

Which modulation technique utilizes a combination of amplitude and phase encoding?

  • Discrete Multi Tone Modulation (DMT)
  • Carrier-less Amplitude Phase (CAP) Modulation (correct)
  • Pulse Amplitude Modulation (PAM)
  • Quadrature Amplitude Modulation (QAM)

What frequency range is typically used by ADSL for the up- and down-link?

  • 1.1 MHz to 2 MHz
  • 0 kHz to 4 kHz
  • 35 kHz to 1.1 MHz (correct)
  • 4 kHz to 35 kHz

Which standard was agreed upon by the T1E1.4 Committee in 1993 for ADSL?

  • Multicarrier Modulation (MCM)
  • Advanced Frequency Modulation (AFM)
  • Discrete Multi Tone Modulation (DMT) (correct)
  • Continuous Wave Modulation (CWM)

What traffic class is bypassed by Quadrature Amplitude Modulation (QAM)?

<p>Forward Error Correction (FEC) (B)</p> Signup and view all the answers

What is the purpose of the lower 4 kHz frequency in ADSL systems?

<p>Dedicated to POTS (Plain Old Telephony System) (D)</p> Signup and view all the answers

What is the primary focus of telecommunications?

<p>The method of calling or contacting someone supported technologically (B)</p> Signup and view all the answers

What does the term 'tele' in telecommunications signify?

<p>Distance or remote communication (B)</p> Signup and view all the answers

Which of the following best describes data?

<p>Characters or continuous functions representing information (C)</p> Signup and view all the answers

How is multimedia defined in telecommunications?

<p>The combination of different communication media (C)</p> Signup and view all the answers

What is included in the objectives of telecommunications?

<p>Explaining the characteristics and classifications of applications (A)</p> Signup and view all the answers

Which statement accurately represents the difference between information and data?

<p>Information encompasses a collection of contents, while data are defined continuously (C)</p> Signup and view all the answers

What does the combination of telecommunication and computers enable?

<p>Local processing power with distributed usage at remote locations (A)</p> Signup and view all the answers

Which of the following is NOT a topic covered in Chapter 1 of telecommunications?

<p>Protocols for operations of multimedia communications (C)</p> Signup and view all the answers

What is the primary difference between speech and non-speech sound?

<p>Speech conveys semantics, while non-speech does not. (B)</p> Signup and view all the answers

Which audio format represents synthesized sound in a symbolic way?

<p>MIDI files (C)</p> Signup and view all the answers

Which digital audio format has a standard sampling rate for telephone quality?

<p>8,000 sample/s (A)</p> Signup and view all the answers

What is the characteristic of high-resolution audio?

<p>It requires a sampling frequency often above CD quality. (A)</p> Signup and view all the answers

Which compression technique achieves higher audio quality by reducing bandwidth?

<p>CD MUSICAM standard (MPEG) (A)</p> Signup and view all the answers

In digital audio formats, what is the total throughput rate for a CD audio?

<p>1.4112 Mbit/s (D)</p> Signup and view all the answers

Which of the following describes the delay in audio signal transmission?

<p>It can be one-way or interactive. (C)</p> Signup and view all the answers

What is the error rate for text data transmission as mentioned?

<p>&lt; 10-5 (A)</p> Signup and view all the answers

What is the primary purpose of protocols in multimedia communications?

<p>To support multiple application requirements (A)</p> Signup and view all the answers

Which chapter focuses on Quality of Service (QoS) methods?

<p>Chapter 8 (D)</p> Signup and view all the answers

Which protocol technology is addressed in Chapter 6?

<p>IP Technology and MPLS (D)</p> Signup and view all the answers

Which chapter discusses operations management in the context of multimedia?

<p>Chapter 10 (D)</p> Signup and view all the answers

Which chapter potentially receives updates according to the course outline?

<p>Chapter 4 (C)</p> Signup and view all the answers

What does Chapter 11 focus on in the context of multimedia protocols?

<p>Messaging and Overlays (D)</p> Signup and view all the answers

Which chapter provides an introduction to telecommunications?

<p>Chapter 1 (A)</p> Signup and view all the answers

What is addressed in Chapter 12 of the course outline?

<p>Messaging and Overlays (D)</p> Signup and view all the answers

What type of networks are discussed in Chapter 3?

<p>High Speed Networks (B)</p> Signup and view all the answers

Which assistant can be contacted at the University of Zürich for assistance?

<p>Both B and C (D)</p> Signup and view all the answers

What is the primary function of padding (PAD) in a trailer?

<p>To shift relevant content to the end (B)</p> Signup and view all the answers

What does the IP68 rating indicate about an enclosure?

<p>It offers complete protection against water and dust. (A)</p> Signup and view all the answers

Which of the following is NOT a function of the ATM layer?

<p>Handling transmission errors (D)</p> Signup and view all the answers

What distinguishes a Permanent Virtual Circuit (PVC) from a Switched Virtual Circuit (SVC)?

<p>PVCs are manually configured while SVCs are automated (A)</p> Signup and view all the answers

What is the primary function of multiplexing in a Passive Optical Network (PON)?

<p>To combine multiple signals onto a single fiber. (B)</p> Signup and view all the answers

What should be negotiated during the User Network Interface (UNI) setup?

<p>Traffic characteristics and QoS parameters (A)</p> Signup and view all the answers

What wavelength is used for downstream data packets in a PON?

<p>$1,490 nm$ (B)</p> Signup and view all the answers

What does the acronym ONU stand for in the context of PONs?

<p>Optical Network Unit (A)</p> Signup and view all the answers

Which interface primarily supports the connection between public ATM providers?

<p>Broadband Inter-Carrier Interface (B-ICI) (D)</p> Signup and view all the answers

What is the main goal of the Private Network-Network Interface (P-NNI)?

<p>Setup ATM connections based on QoS and topology (A)</p> Signup and view all the answers

Which component is responsible for sending time reference signals in the upstream direction of a PON?

<p>OLT (C)</p> Signup and view all the answers

What capacity do universal splice cabinets typically have for fiber splices?

<p>Up to 6912 fibers (B)</p> Signup and view all the answers

Which component is responsible for cell delineation in the Physical layer?

<p>HEC header sequence generation (C)</p> Signup and view all the answers

What is a characteristic of Hybrid Fiber Coax (HFC) systems?

<p>They support a shared bus architecture for resource efficiency (C)</p> Signup and view all the answers

What role does Time Division Multiple Access (TDMA) play in a PON?

<p>It allows multiple users to transmit simultaneously in defined time slots. (B)</p> Signup and view all the answers

Which of the following correctly describes a splice enclosure?

<p>It is used to house and splice fiber optical cables. (D)</p> Signup and view all the answers

What does the setup of ATM connections in UNI 4.0 involve?

<p>Establishing negotiation of traffic characteristics (C)</p> Signup and view all the answers

What speed characteristics does a traditional telephone system typically support?

<p>Low-speed bearer service of 2 x 64 kbit/s (A)</p> Signup and view all the answers

What does WDM stand for and its purpose in a PON?

<p>Wavelength Division Multiplexing; for enabling bidirectional communications. (C)</p> Signup and view all the answers

What type of behavior is observed in downstream data packets transmitted in a PON?

<p>Broadcasted to all connected ONUs. (B)</p> Signup and view all the answers

Flashcards

Network Protocols

The set of rules and procedures used for communication between devices on a network.

High Speed Network

A type of network that focuses on providing high data transfer rates.

Telecommunications

Used to communicate over long distances, supporting various applications and network services.

Optical Networks

A type of fiber optic network where signals are transmitted through optical fibers, using light pulses to carry data.

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ATM (Asynchronous Transfer Mode)

A network architecture where data is transmitted in small, fixed-size units called cells.

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ADSL (Asymmetric Digital Subscriber Line)

A type of digital subscriber line technology for high-speed internet access over existing telephone lines.

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IP (Internet Protocol)

A protocol used for routing data packets across the internet.

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QoS (Quality of Service)

A technology that helps prioritize information based on its importance, ensuring better delivery during network congestion

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Operations Management

Refers to the management and control of network operations, including monitoring, maintenance, and troubleshooting.

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Software-defined Networks (SDN)

A type of network architecture that allows for flexible and centralized network control.

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Communication

The process of exchanging information between two or more entities, traditionally using voice, letters, or drawings.

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Information

Knowledge about subjects, topics, activities, opinions, issues, or devices. It is often considered information and knowledge.

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Data

Characters or continuous functions representing information for processing in a well-defined manner (DIN 44300).

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Digital Data

Coded discrete characters representing data in a digital format.

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Combination of telecommunication and computers

It involves using telecommunication to connect computers for processing and distributed usage across remote locations.

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Multimedia

A type of communication that involves diverse media such as audio, video, text, and graphics, where these elements are integrated and presented together.

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Multimedia applications

Applications that utilize various media such as audio, video, text, and graphics to provide a rich user experience.

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dB (Decibel)

A way to express the ratio of two power values using a logarithmic scale.

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Splice Enclosure

An enclosure for protecting and housing fiber optic cables, where splicing takes place.

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Universal Splice Cabinet

A type of splice cabinet that offers flexibility in accommodating different splice requirements.

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WDM (Wavelength Division Multiplexing)

A technique used to transmit signals with different wavelengths over the same optical fiber, allowing bidirectional communication.

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Multiplexing

Combining multiple data streams onto a single channel for transmission over a network.

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TDMA (Time Division Multiple Access)

A method for transmitting data packets from multiple users in a shared network where each user gets a specific time slot.

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Downstream Direction in PON

The downstream direction in a PON network, where data travels from the OLT (Optical Line Terminal) to the ONUs/ONTs.

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Upstream Direction in PON

The upstream direction in a PON network, where data travels from the ONUs/ONTs to the OLT.

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PON Standards (B, G, XG, NG, XGS, NG-E)

A standard for various generations of Passive Optical Networks (PON), with increasing data transfer rates.

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Optical Access Network Topology

A network topology where the OLT (Optical Line Terminal) connects to the ONUs/ONTs (Optical Network Units/Terminals) through a shared fiber optic cable.

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Non-speech sound

Sounds that do not communicate meaning, unlike speech which conveys semantics.

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Natural sound

Sound obtained from natural sources, like recordings.

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Structured sound

Sound created artificially, such as with computer programs.

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Audio throughput

The rate at which audio data is transferred, measured in bits per second (bps).

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Audio compression

Techniques that reduce the size of audio files without losing too much quality.

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Audio delay

Audio signal processing techniques where the signal is delayed intentionally to create effects or enhance sound.

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High-resolution audio

A high-quality audio format that aims to reproduce the full range of sound from recordings with better detail and sound fidelity than standard CDs.

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Pulse Code Modulation (PCM)

A standard that uses digital pulses to represent audio signals, often used for telephone communication.

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CAP Modulation (Carrier-less Amplitude Phase Modulation)

A type of modulation technique used in ADSL technology that uses multiple levels and phases to encode data. It allows for real-time adjustment of bit rate and utilizes a frequency range from 35 kHz up to 1.1 MHz for up- and down-link communication.

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DMT Modulation (Discrete Multi Tone Modulation)

A modulation technique in ADSL technology where data is split into multiple sub-frequencies called tones (typically 256). Each tone carries a specific amount of data, and the overall bit rate is achieved by combining the data from all tones. It allows simultaneous operation with traditional phone service (POTS) by using different frequency bands.

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QAM Modulation (Quadrature Amplitude Modulation)

A modulation technique used in ADSL technology where two separate traffic classes are used to bypass forward error correction (FEC). This allows for faster data transmission, but it makes the system more susceptible to errors.

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Discrete Multi-Tone (DMT) Modulation

A technique for transmitting data over a network using multiple frequencies (tones). It is highly efficient for high-bandwidth applications and is a key feature of ADSL technology.

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Study Notes

Multimedia Communications Protocols (PMMK)

  • This lecture covers protocols for multimedia communications, including details on various aspects of communication systems.
  • The course content covers several chapters.

Lecture Outline

  • Chapter 1: Telecommunications
  • Chapter 2: High Speed Networks (HSN)
  • Chapter 3: High-speed Optical Networks
  • Chapter 4: Passive Optical Networks
  • Chapter 5: ATM and ADSL
  • Chapter 6: IP Technology and MPLS
  • Chapter 7: QoS Basics and Modeling
  • Chapter 8: QoS Methods
  • Chapter 9: (QoS) Monitoring
  • Chapter 10: Operations Management
  • Chapter 11: Transport Protocols
  • Chapter 12: Optimized Transport
  • Chapter 13: Software-defined Networks (SDN)
  • Chapter 14: Messaging and Overlays

Teaching Aids

  • IEEE Network Magazine
  • ACM Computer Communication Review (includes SIGCOMM)
  • IEEE Communications magazine
  • Computer Communication
  • IEEE Journal on Selected Areas in Communications
  • IEEE Computer
  • Computer Networks (formerly Computer and ISDN Systems)
  • IEEE Infocom and IEEE Globecom
  • Recommendations (ITU-T) and Standards (ISO)
  • Request for Comments (RFC)

Key Concepts

  • Multimedia applications, both traditional and advanced, need appropriate communication architectures, networks, and protocols, to bridge physical distances, meet application demands, and for successful operation.
  • Specific multimedia protocols like ATM and protocols for managing quality of service (QoS) also play a significant role in efficiently and effectively transferring multimedia data.
  • Challenges associated with multimedia communication include issues relating to resource allocation, efficient bandwidth usage, and addressing the need for real-time delivery.
  • QoS parameters, such as delay, jitter, bandwidth, loss, and availability, determine the quality of the communication experience.
  • Various mechanisms, like traffic shaping and congestion control, ensure consistent and reliable data transfer. Different transmission media, like optical fiber, play critical roles in high-speed networking, impacting performance.
  • The protocols for these systems are managed via a network control plane.
  • Operation and Management of networks is addressed in layers and components.
  • Network devices, such as switches, routers, and multiplexers, play a crucial role.
  • Software-defined networking (SDN) offers a more flexible and programmable approach to network management, potentially increasing performance.
  • Message brokers and VPNs are important protocols for communication with other systems.
  • Understanding these components and characteristics is vital for the design, implementation, and success of multimedia communication systems.

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