technical education click here to move on index h.323 related standards lesson 4

Technical Education

Click here to move on

IndexIndexH.323 Related StandardsH.323 Related Standards

Lesson 4

2

© Copyright Ezenia Inc, 2000

Lesson objectives

This lesson will introduce you to the various International Standards associated with H.323. These standards define such things as the protocols used for setting up and controlling the connections, and how the Video and Audio signals are to be carried.

Many of the problems experienced when setting up an H.323 conference are associated with a mis-match in the relevant protocols used by the endpoints. You will need to understand the differences between these protocols, in order to resolve such problems.

Previous

Beginning

Help

Next

3


Standards

Data Transport Standards

Multimedia Conferencing

Standards

Standards Bodies

LAN Standards

Previous

Beginning

Help

• Why do I need to know about all this?

4


Standards bodies

Standards are essential in the communications industry because they ensure compatibility of equipment throughout the world. These standards are not usually created by one centralised body, but are usually developed for a specific country, or for a particular communications area. The most important standards bodies associated with Data communications are

These standards are now being moved under the umbrella of the ITU. Specifically the standards we are interested in are under the jurisdiction of

Standards

Beginning

Help

ITU-Telecommunications.

the ATM Forum,

the Internet Engineering Task Force (IETF).

the American National Standards Institute,the Institute of Electrical and Electronic Engineers (IEEE),

Review Questions

5


ITU-T standards

The International Telecommunication Union is part of International Standards Organisation, which in turn is part of The United Nations.

It is responsible for setting international standards where Public networks are involved. It’s standards include: V series for modems G series for digital voice X series for packet switched data systems H series for multiplexing, control, multimedia

Beginning

Help

Previous

6


IEEE standards

The Institute of Electrical and Electronics Engineers (IEEE), Inc., “promotes the engineering process of creating, developing, integrating, sharing, and applying knowledge about electrical and information technologies and sciences for the benefit of humanity and the profession.

The membership of the Institute of Electrical and Electronic Engineers is open to working engineers from these two industries. The members of the IEEE 802 sub-committee, responsible for LAN connectivity, are specialists working in data communications industry. The two standards most widely used in the LAN arena today are 802.3, or Ethernet and 802.5, Token Ring”.

. Beginning

Help

Previous

7


ATM Forum standards

The ATM Forum “is an international non-profit organization formed with the objective of accelerating the use of ATM (Asynchronous Transfer Mode) products and services through a rapid convergence of interoperability specifications. In addition, the Forum promotes industry cooperation and awareness.

The ATM Forum consists of a worldwide Technical Committee, three Marketing Committees for North America, Europe and Asia-Pacific as well as the User Committee, through which ATM end-users participate”.

Beginning

Help

Previous

8


IETF standards

The Internet Engineering Task Force is a loose alliance of academics, users, governments and manufacturers, who have adopted the TCP/IP protocol set and work on a basis of general agreement. Recommendations are published but their implementation is entirely voluntary. Because this has become the language of The Internet, there is great commercial demand for compliance with most recommendations, and consequently compatibility is rarely an issue.

Beginning

Help

Previous

9


ANSI Standards

The American National Standards Institute (ANSI) is “the administrator and coordinator of the United States private sector voluntary standardization system. It is a private, nonprofit membership organization supported by a diverse constituency of private and public sector organizations.

ANSI is the sole U.S. representative and dues-paying member of the the International Organization for Standardization (ISO), and, via the U.S. National Committee (USNC), the International Electrotechnical Commission (IEC).

In the data communications arena, ANSI has been responsible for promoting the development of the Fiber Distributed Data Interchange (FDDI) standard”.

Beginning

Help

Previous

10


The IETF is part of the United Nations.

True

False

Standards Bodies - Review Question 1

Beginning

HelpReview that

information again

Standards Bodies

Move onto the

next question

11


The Internet Engineering Task Force in responsible for controlling the definition of protocols for the Internet, but it is not part of the United Nations.

The ITU-T is part of the United Nations

Wrong Answer

Review thatinformation again

Beginning

Help

Move onto the

next question

Standards Bodies

12


Correct Answer


Well done The Internet Engineering Task Force in responsible for

controlling the definition of protocols for the Internet, but it is not part of the United Nations.

The ITU-T is part of the United Nations

Beginning

Help

Move onto the

next question

Standards Bodies

13


Which of the following Standards Bodies is responsible for the definition of the Ethernet and Token Ring LAN standards?

ANSI

IEEE

IETF

ITU-T

Standards Bodies - Review Question 2

Beginning

HelpReview that

information again

Standards Bodies

14


The IETF is responsible for Internet Standards.

The IEEE defined Ethernet as IEEE 802.3 and Token Ring

as IEEE 802.5.

Wrong Answer


Beginning

Help

Standards

15


ANSI is responsible for the FDDI networking standard. The IEEE defined Ethernet as IEEE 802.3 and Token Ring

as IEEE 802.5.

Wrong Answer


Beginning

Help

Standards

16


The ITU-T is responsible for setting international standards where Public networks are involved.

The IEEE defined Ethernet as IEEE 802.3 and Token Ring as IEEE 802.5.

Wrong Answer


Beginning

Help

Standards

17


Correct Answer


Well done The IEEE defined Ethernet as IEEE 802.3 and Token Ring

as IEEE 802.5.

Beginning

Help

Standards

18


Local Area Network Standards

The standards used within LANs have been faster moving than those associated with Wide Areas. Therefore a range of organisations have been responsible for evolving standards. To ensure co-ordination of these standards these organisations feed their standards into ITU. The main organisations with relevant standards today are

For example, Xerox, Digital and Intel produced a technology known as Ethernet; it became a standard known as IEEE 802.3, and was then accepted by ITU and became ISO 8802.3.

Standards

Beginning

Help

the ATM Forum,the American National Standards Institute,the Institute of Electrical and Electronic Engineers (IEEE).

Review Questions

19


There are several organisations responsible for defining LAN standards.

True

False

LAN Standards - Review Question 1

Beginning

HelpReview that

information again

LAN Standards

20


There is only one body which defines standards to be used with public networks – the ITU-T.

As the standards used within LANs have been faster moving than those associated with Wide Areas, a range of organisations have been responsible for evolving these standards.

Wrong Answer


Beginning

Help

LAN Standards

21


Correct Answer


Well done As the standards used within LANs have been faster

moving than those associated with Wide Areas, a range of organisations have been responsible for evolving these standards.

Beginning

Help

LAN Standards

22


Data transport standards

Standards have not been so rigidly set when it comes to sending data over a network. The ISO did set a range of standards, known as OSI, but they were too cumbersome to be of commercial value. Therefore a number of manufacturers have developed “open” standards which others are able to use. These include Novell’s NetWare, Microsoft’s NetBEUI and IBM’s SNA/SDLC.

The exception to this are the range of standards which make up the work of

Beginning

Help

the Internet Engineering Task Force.

Standards

Review Questions

23


Which of the following protocols is NOT a Data Transport standard.

NetBEUI

NetWare

FDDI

SNA

Data Transport Standards – Review Question 1

Beginning

HelpReview that

information again


24


NetBEUI is a data Transport standard developed by Microsoft.

FDDI, Fibre Distributed Data Interchange, is an Access method protocol.

Wrong Answer


Beginning

Help


25


SNA is a data Transport standard developed by IBM. FDDI, Fibre Distributed Data Interchange, is an Access

method protocol

Wrong Answer


Beginning

Help


26


NetWare is a data Transport standard developed by Novell. FDDI, Fibre Distributed Data Interchange, is an Access

method protocol

Wrong Answer


Beginning

Help


27


Correct Answer


Well done The FDDI, Fibre Distributed Data Interchange, is an

Access method protocol.

Beginning

Help


28


Why do I need to know that?

Multiple standards exist for many functions Some will operate together Some can be translated one to another Some do not! Interoperability between different vendors equipment is

crucial to a successful conference. Not all vendors implement the same standards, and some standards will inter-operate while others will not. A basic knowledge of the standards will help you to identify these situations, and will help you to understand error messages. Standards

Beginning

Help

• How could it affect my network?

29


Why do I need to know that?

In the diagram, endpoints transmitting signals of Type A will clearly communicate; Type B can be transcoded into Type A and so can communicate, but Type X cannot be transcoded. It is therefore quite obvious why the endpoint using Type X cannot successfully join the conference.

Previous

Beginning

Help

Type A

Type B

Type X

technical education click here to move on index h.323 related standards lesson 4

Documents