VAN (value added network)

In 1 kind of data transmission service, not only mere signal transmission, packed switching and E-mail, is the circuit network service which offers addition function such as code conversion, protocol conversion and format conversion of the EDI data collectively.

As for VAN which in the seventies appears in the United States, first stage the data communication which utilizes the telephone line (packet conversion) in the center, information processing function such as information processing function and database service etc. of E-mail and the like it was offered to other things. ThisTSS remote common use service of the computer) probably can also see as the thing which is changed to developmental shape, or network service.

In US as for telecommunications business it made the NTT monopoly to that, it was prohibited that the general telephone line is used in data communication, but 1971/passing the amendment of public telecommunications method 1982, it reached the point where the VAN service opening the communications network by the consecutive advancing and notification trader is done.

When it is 1985, public telecommunications method was abolished attendant upon the NTT commercialization, telecommunications business law was enacted. With the same law it designated the business which possesses transmission line equipment as type I carriers, borrowed the circuit and it permitted the business which resells the communication service which adds performance such as data conversion as second kind telecommunications business, it reached the point where the colorful VAN enterprise appears on the basis of this, (VAN offer was permitted even at the type 1 carrier).

As for VAN as the strange type connection service with data conversion, all cords/codes of society/as for corresponding to protocol/the format because it is impossible, it developed as limits the range such as between main branch office of big business and between, or industry area serial enterprise. In addition, there is also a International Value Added Network and the like which offers the communication between international base. Also the personal computer communication which opens utilization to the end user is one kind of VAN.

It has become the word which recently is many also the fact that Internet is utilized in data communication, is not used excessively telecommunications business method amendment 2003 (2004 April 1st enforcement) with first class/partly due to the fact that there not to be division of second kind at telecommunications business.