Theory & Practice

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  • Topic: Integrated Services Digital Network, ISDN, D channel
  • Pages : 60 (17250 words )
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  • Published : December 13, 2012
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ISDN: Theory & Practice

Basic Concepts................................................................................................................................ 2 B & D channels............................................................................................................................... 5 ISDN Networks............................................................................................................................. 12 Bearer Capabilities ........................................................................................................................ 15 Voice, Fax, and Modems............................................................................................................... 18 Terminology ................................................................................................................................. 25 Device Addressing ........................................................................................................................ 30 Call Setup ..................................................................................................................................... 33 Managing inbound calls ................................................................................................................ 40 Rate Adaption ............................................................................................................................... 44 Cabling ......................................................................................................................................... 47 More Termins ............................................................................................................................... 52

routed by Mr.Goblins [2002]
updated by Mr. Vesa Kosonen [ 2007]

Basic Concepts
In this section you will find out:
• The definition of ISDN
• Basic Rate and Primary Rate ISDN
• What an ISDN line provides to the user
• How ISDN provides services to the user
• What the B and D channels are used for

What is ISDN?
Integrated Services Digital Network is a set of digital transmission protocols defined by the international standards body for telecommunications, the ITU-T (previously called the CCITT). These protocols are accepted as standards by virtually every telecommunications carrier all over the world.

ISDN complements the traditional telephone system so that a single pair of telephone wires is capable of carrying voice and data simultaneously. It is a fully digital network where all devices and applications present themselves in a digital form. The essential difference between ISDN and the conventional telephone system is that it is digital not analogue. Information travels as bits rather than as waves. In addition, it also allows multiple streams of these bits to occupy the same connection, providing the user with greater versatility of services.

What are the applications for ISDN?
The Integrated Services Digital Network uses the twisted-pair copper telephone line that would traditionally carry only one voice connection. ISDN can carry more than one connection over this wire at the same time, and at greater speed. Applications include telecommuting; simultaneous voice, fax, data and e-mail; inexpensive videoconferencing; remote broadcasting and high quality audio transmission.

ISDN handles all types of information - voice, data, studio-quality sound, static and moving images. They are all digitised, and transmitted at high speed. ISDN can handle many devices and many telephone numbers on the same line. Up to eight separate telephones, fax machines or computers can be linked to a single Basic Rate ISDN connection and have different phone numbers assigned to them. (We'll explain Basic Rate in the following pages).

A Basic Rate ISDN line can support up to two calls at the same time. Any combination of voice, fax or PC connections can take place at the same time, through the same ISDN...
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