What is the ISDN?

ISDN stands for Integrated services Digital Network. It is the set of protocols that combines the digital telephony and data transport services offered by regional telephone carriers.

ISDN performs digitalization of the telephone of the telephone networks and thus allows the transmissions, music, video and other data forms on telephone wire.

The Devices used in the ISDN are following –

* Terminals
* Terminal Adapters
* Network Termination devices
* Line Termination Equipment
* Exchange Termination Equipment

Applications of ISDN are following –

* It has a high speed image applications that is used to transfer data between two or more users.

* It also has a high speed data transfer as the bit transfer rate through ISDN is very high.

* It also has very good voice service.

* It is also used in the video conferencing in which we have used the various devices like camera, microphone, speakers, TV etc for carrying out communications with various users for formal purposes.

* It also provides Additional telephone lines in the homes etc.

What is the applications of ISDN with its types?

What is the applications of ISDN with its types?

Two Types of services offered by ISDN are following-

* BRI services
* PRI services

BRI services

BRI stands for the Basic Rate Interface. The ISDN BRI services offer two B channels and one D channel.

The B stands for bearer and D for data services. The B channel services operate at 64 KBPS. They are meant to carry user data. The D channel services are meant to carry control and signaling information. D-Channel service operates at 164 Kbps.

The total bit rate of BRI services is 192 Kbps and it provides framing control and other overheads too.

PRI Services

PRI stands for Primary Rate Interface Service. The ISDN PRI service offers 23 B Channels and one D channel. It provides total bit rate of 1.544 Mbps.

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