How ISDN Works

ISDN stands for "Integrated Services Digital Network" and is used for sending voice, data, and video over an existing telephone network. With an ISDN line voice, data, and video can be transmitted over a single ISDN line within seconds as opposed to a modem which requires a short delay period before the data is transmitted. ISDN provides reliable and consistent high speed data transmission and is one of the faster methods for transmitting data and accessing a network.

How ISDN Works

ISDN utilizes a standard telephone line consisting of a copper wire pair to transmit data, voice, and video. An IDSN cable is capable of converting the telephone line from a single circuit into multiple circuits that run at high speed for transmitting voice, video, and data. This is why ISDN is the preferred choice for connecting and using videoconferencing equipment.

When you use multiple devices on a standard telephone line it requires multiple telephone lines to run each device simultaneously. With an ISDN line you can run all of the devices on a single wire without any interference between the devices.

There are two types of ISDN which include the Basic Rate Interface (BRI) and the Primary Rate Interface (PRI). The Basic Rate Interface (BRI) is designed to be used for home networks and comes with three different channels for transmitting data over one line. The Primary Rate Interface (PRI) is designed for use with a large business and provides 24 different channels which are used for data transmission and videoconferencing which is accomplished over a single line.

ISDN and DSL

Integrated Services Digital Network (ISDN) and Digital Subscriber Lines (DSL) are often confused with one another.

ISDN lines and DSL (Digital Subscriber Line) both transmit data quickly and efficiently over one line. A DSL connection is somewhat faster than an ISDN connection; however ISDN is generally more expensive than a DSL connection. This is due to the fact that an ISDN line requires installation where a DSL connection can be established on an existing line to a home or business.

ISDN connections are established through a dial-up interface where a DSL connection always remains connected so you do not have to log on every time you want to use the Internet. With DSL you can choose from two different types of connections which will depend upon whether you do more uploading to the Internet or downloading from the Internet. With both ISDN and DSL connections the speed of the connection will depend upon how far you are located from the central connection location.

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