Telecommunication Network NGN Services Quiz

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Questions and Answers

What is a scenario where unicast-based delivery of IPTV is typically used?

When multicast delivery is more efficient

When users are nomadic within the network (correct)

When IPTV service provider is in the user's domain

When users are within the same network

Which model of IPTV content delivery combines features of both cluster and peer-to-peer systems?

Cluster model

Network multicast model

Hybrid model (correct)

Peer-to-peer model

What protocol stack forms the basis for web services in NGN?

HTTP/FTP/IP

HTTPS/TCP/IP

IP/TCP/UDP

HTTP/TCP/IP (correct)

What does WSDL stand for in the context of web services?

Web Services Definition Language Signup and view all the answers

Which of the following was an early concept related to Fixed-Mobile Convergence?

UMA (Unlicensed Mobile Access) Signup and view all the answers

What is the appropriate NGN interface for web service providers?

Application–Network Interface (ANI) Signup and view all the answers

What type of service is considered the most important in a best-effort Internet?

Web services Signup and view all the answers

Which of the following statements about multicast models for IPTV is accurate?

There are four defined functional models. Signup and view all the answers

What describes the SIP triangle scenario in VoIP?

Both VoIP users are located in the same domain served by the same proxy server. Signup and view all the answers

Which type of IPTV functional architecture does not involve the use of IMS?

NGN-based non-IMS IPTV functional architecture Signup and view all the answers

How does multicast-based IPTV content delivery function?

It delivers IPTV packets simultaneously to multiple destinations from a single source. Signup and view all the answers

Internet Protocol Television (IPTV) is characterized by:

Providing multimedia services over IP-based networks designed for high QoS. Signup and view all the answers

What is a critical requirement for IPTV to become feasible?

Availability of higher bit rates and broadband access networks. Signup and view all the answers

What distinguishes NGN IMS-based IPTV functional architecture?

All components of the NGN including IMS entities are utilized. Signup and view all the answers

Which of the following is NOT a service characteristic of IPTV?

Delivery of static content only. Signup and view all the answers

In a peer-to-peer SIP scenario, what is excluded?

All SIP network elements. Signup and view all the answers

What is a key advantage of VoIP over PSTN related to network service?

Lower operational costs due to service convergence Signup and view all the answers

How does the packet delay in PSTN compare to that in VoIP?

PSTN has controlled and constant packet delay below 150 ms Signup and view all the answers

What aspect of VoIP results in its packets accumulating jitter?

Statistical multiplexing and packet scheduling Signup and view all the answers

Which of the following statements about the network equipment used in VoIP is true?

VoIP uses intelligent terminals and simpler network nodes Signup and view all the answers

What criteria are set for service reliability in both VoIP and PSTN?

Availability of 99.999% during the year Signup and view all the answers

What type of signaling is shown in the scenarios for VoIP connections?

Session Initiation Protocol (SIP) Signup and view all the answers

Which of the following best describes the bit rate provided by PSTN for digital telephony?

Consistent 64 kbit/s using G.711 codec Signup and view all the answers

Why does PSTN exhibit lower jitter compared to VoIP?

PSTN has controlled multiplexing settings Signup and view all the answers

Study Notes

Course Information

Course code: DEP30083
Course name: Telecommunication Network

Course Learning Outcomes

Apply basic switching, transmission, and signaling concepts in telephone networks, using appropriate block diagrams. (C3, PLO1)
Solve engineering problems related to line speed and teletraffic using designated formulas. (C3, PLO2)
Construct and test various communication equipment applications, performing practical work with standard test equipment. (P4, PLO5)
Demonstrate teamwork skills for completing assigned tasks during practical work sessions. (A3, PLO11)

Topic 5: NGN Services

5.1 Apply the understanding of VoIP:
- VoIP, since the invention of telephony in 1876, remains a crucial service.
- VoIP uses IP-based networks and internet technologies for voice communication.
- Needs quality of service (QoS) support via well-standardized protocols and mechanisms for end-to-end guarantees.
5.2 Understand IPTV over NGN:
- IPTV delivers multimedia (TV, video, audio, pictures/graphics, data) over IP-based networks.
- Aims to provide QoS and QoE (quality of experience).
- IPTV is a successor to digital TV broadcasting (like terrestrial or cable TV) in convergent IP environments.
5.3 Apply the understanding of Web Services in NGN:
- Web services are critical in best-effort internet scenarios.
- HTTP/TCP/IP protocol stacks are fundamental.
- Web services expanded globally with HTTP standardization.
5.4 Understand Fixed-Mobile Convergence:
- FMC (fixed-mobile convergence) is not new. It started with DECT, UMA, and GAN.
5.5 Apply Understanding of Ubiquitous Sensor Network Services:
- Ubiquitous Sensor Networks (USN) are emerging NGN services.
- Twenty-first-century sensor networks cater to various fields.
5.6 Understand VPN Services in NGN:
- VPN (virtual private network) solutions are essential in all-IP transport networks.
- MPLS/BGP IP VPNs, standardized by the IETF, are common.
5.7 Understand the Various Concepts in NGN:
- NGN has a broader vision, as described in an ITU report [20].
- IoT is a core NGN component that facilitates the information society.
- Combines physical and virtual 'things' for enhanced services. Merging IoT and WWW creates a Web-of-Things.

VoIP and PSTN Differences

Bit rates: PSTN uses constant 64kbit/s (using G.711 codec), while VoIP varies.
Packet delay: PSTN has controlled, constant delays below 150ms; VoIP delays vary due to statistical multiplexing and higher IP packet processing times.
Jitter: PSTN has low packet delay variations; VoIP suffers from jitter.
Network equipment: PSTN uses intelligent exchanges; VoIP can use simpler network nodes.

SIP Scenarios

SIP (Session Initiation Protocol) scenarios are critical for VoIP connections.
Figure 7.10 visualizes three SIP scenarios.
- Scenario 1: VoIP users in different domains, using separate proxy servers.
- Scenario 2 (SIP triangle): VoIP users share the same proxy server.
- Scenario 3 (peer-to-peer): VoIP users interact without any SIP network elements.

IPTV Functional Architecture

Three types of IPTV architectures:
- Non-NGN: using existing protocols and network interfaces.
- NGN-based non-IMS: utilizing NGN functional entities (no IMS system).
- NGN IMS-based: utilizes all NGN components, including IMS.

Multicast-Based IPTV Content Delivery

Multicasting delivers IPTV packets simultaneously to multiple destinations.
ITU-T models for multicast: network, cluster, p2p, or hybrid models.

Unicast-Based IPTV Content Delivery

Unicast is common when users are mobile.
Two scenarios exist: non-roaming and NGN roaming.

IMS-Based IPTV Session Setup

Diagram (Figure 8.9) depicts IMS-based IPTV session setup.

Web Services in NGN

Web services are crucial in best-effort internet scenarios.
Web services are based on HTTP, TCP/IP, and protocol stacks.
Web Service providers use WSDL (Web Services Description Language) to register services.

NGN Architecture Extension with Web Services

Diagram (Figure 23) illustrates how Internet-based NGN services can adapt using Application Network Interfaces.

Fixed-Mobile Convergence (FMC)

FMC is not a new concept, tracing back to DECT.
Certain objectives for FMC are specified by ITU-T (International Telecommunication Union - Telecommunications).

Network Virtualization

Many network infrastructures utilize interconnected nodes like switches, routers, and hosts.
A generalized approach involves converging internet technologies to build new applications and allow the addition of features like QoS, mobility, and security without redesigning the architecture of the network.
The concept uses multiple interconnected logically isolated network partitions to support virtualization.

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Description

Test your knowledge on Next Generation Network (NGN) services, focusing on VoIP and IPTV. This quiz delves into the essentials of VoIP technology, its historical significance, and QoS requirements. Assess your understanding of IPTV applications and their role in modern telecommunication.