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I want an answer what PSDN is and an article on PSDN as a network technology?

PSDN is public switched digital network. send me its history,advantages, how it works,contribution to IT

Public Comments

1. beeng nice and beauty
2. Well you already have your start.. publicly switched digital network also publicly switched data network as opposed to PSTN publicly switched telephone network.. From there you should be able to simply do a search to find out the rest. There isn't enough space on answers to cover it.
3. PSDN is an acronym for public switched data network, a publicly-available network supporting packet-switched data, separate from the PSTN. Originally this term referred only to PSS (Packet Switch Stream), an X.25-based packet-switched network, mostly used to provide leased-line connections between local area networks and to the Internet using permanent virtual circuits (PVCs) . Today the term may refer not only to Frame relay and ATM (both also providing permanent virtual circuits), but also IP, GPRS and other packet switching techniques. Although superficially similar to the PSDN, ISDN, ADSL, SDSL and VDSL are not examples of it. ISDN utilizes the PSTN circuit switched network, and DSL are point-to-point circuit mode communication services overlaid on the PSTN local loop copper wires, usually utilized for access to a packet switched broadband IP network.