Videoconferencing.
Video telephony
Fax services
DSL services and ISDN services
ISDN stands for Integrated Services Digital Network
ISDN stands for Integrated Services Digital Network
ISDN ISDN or Integrated Services Digital Network was designed to be integrated into current digital telephone services and was originally designed to bring high speed voice and data to home users.
ISDN: Integrated Services Digital Network DSL: Digital Subscriber Line
The National ISDN, also referred to as NI-2, is a standard for PRI switch implementation and is said to support applications that are cost-effective. National ISDN is considered the industry standard.
Integrated Services Digital Network
Multiparty
ISDN stands for Integrated Services for Digital Network. The purpose of its D-channel is to carry the information of call sessions.
The most important development in the computer communications industry in the 1990s is the evolution of the integrated services digital network (ISDN) and broadband ISDN (B-ISDN). The ISDN and B-ISDN have had a dramatic impact on the planning and deployment of intelligent digital networks providing integrated services for voice, data and video. Further, the work on the ISDN and B-ISDN standards has led to the development of two major new networking technologies; frame relay and asynchronous transfer mode (ATM). Frame relay and ATM have become the essential ingredients in developing high-speed networks for local, metropolitan and wider area applications. The ISDN is intended to be a worldwide public telecommunications network to replace existing public telecommunication networks and deliver a wide variety of services. The ISDN is defined by the standardization of user interfaces and implemented as a set of digital switches and paths supporting a broad range of traffic types and providing value added processing services. In practice, there are multiple networks, implemented within national boundaries but from the user's point of view, the eventual widespread deployment of ISDN will lead to a single, uniformly accessible, worldwide network. The narrowband ISDN is based on the use of a 64 kbps channel as the basic unit of switching and has a circuit switching orientation. The major technical contribution of the narrowband ISDN effort has been frame relay. The B-ISDN supports very high data rates (100s of Mbps) and has a packet switching orientation. The major technical contribution of the B-ISDN effort has been asynchronous transfer mode, also known as cell relay. CIRCUIT SWITCHING The circuit switching is the dominant technology for both voice and data communications. Communication via circuit switching implies that there is a dedicated communication path between two stations. That path is a connected sequence of links between network nodes. On each physical link, a channel is dedicated to the connection. The three phases involved in a communication via circuit switching are circuit establishment, information transfer and circuit disconnect.
Integrated services digital network
An isdn stands for integrating services digital network ,it is a communication media througt which we can transmitte our voice,video and data, in isdn line two modem are used to for commnication one at source and other at the destination ,these modems are called isdn modem this is Qadar wafa from Kabul qadarwafa_4all@yahoo.com qadarwafa@multinet.af qadar-08@hotmail.com