OCN (オーシーエヌ), or Open Computer Network(オープン・コンピュータ・ネットワーク:Ōpun Konpyūta nettowāku), is the largest Japanese

Internet service provider An Internet service provider (ISP) is an organization that provides services for accessing, using, or participating in the Internet. ISPs can be organized in various forms, such as commercial, community-owned, non-profit, or otherwise privatel ...

, with over 7 million subscribers. It is owned by NTT Communications Corp, one of the largest

telecommunication Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than tha ...

companies in the world. It offers

dial-up Dial-up Internet access is a form of Internet access that uses the facilities of the public switched telephone network (PSTN) to establish a connection to an Internet service provider (ISP) by dialing a telephone number on a conventional telepho ...

and

ISDN Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the digitalised circuits of the public switched telephone network. Wor ...

DSL Digital subscriber line (DSL; originally digital subscriber loop) is a family of technologies that are used to transmit digital data over telephone lines. In telecommunications marketing, the term DSL is widely understood to mean asymmetric dig ...

up to 50 Mbit/s and

fiber Fiber or fibre (from la, fibra, links=no) is a natural or artificial substance that is significantly longer than it is wide. Fibers are often used in the manufacture of other materials. The strongest engineering materials often incorpora ...

up to 200 Mbit/s download and 100Mbit/s upload.http://service.ocn.ne.jp/hikari/wflets/charge/ As a result of regulations intended to promote competition, OCN themselves offer only internet service (routing); the physical line can be offered by NTT (the parent corporation), or by another company. Speeds up to 1Gbit/s are offered in Western Japan, while in East Japan only 200Mbit/s is officially offered for residential use, even though the underlying fiber infrastructure is capable of 1Gbit/s. OCN also offers an MVNO mobile broadband service called "OCN Mobile One", based on NTT Docomo's LTE infrastructure, but with data only SIM cards issued by OCN. Cards with and without SMS access are available. (In a tie-up with NTT Communications, one can install the "050+" application and use voice over IP so that the data only SIM cards can be used for voice as well.) Recently a voice sim option has also become available.

References

External links

Official OCN website

Start of OCN Business Web Service and its Future
at Science Links Japan
NTT communications

OCN known as ocn.ad.jp is also the source of a large number of phishing spam emails and Malware distribution activity

Discussion regarding ocn.ne.jp as a source of spam/malware
Internet service providers of Japan NTT Communications {{japan-company-stub

See also

References

External links