Editing ISDN (section)

=== Japan ===

On April 19, 1988, Japanese telecommunications company [[Nippon Telegraph and Telephone|NTT]] began offering nationwide ISDN services trademarked INS Net 64, and INS Net 1500, a fruition of NTT's independent research and trial from the 1970s of what it referred to the INS (Information Network System).<ref>{{cite web |language=ja |website=Denwakyoku |title=Kitahama |url=http://denwakyoku.jp/kitahama.html |script-title=ja:NTT東日本 - 北浜ビル |access-date=2012-06-13 |archive-date=2012-10-17 |archive-url=https://web.archive.org/web/20121017004533/http://denwakyoku.jp/kitahama.html |url-status=live }}</ref>

Previously, in April 1985, Japanese digital telephone exchange hardware made by Fujitsu was used to experimentally deploy the world's first I interface ISDN. The I interface, unlike the older and incompatible Y interface, is what modern ISDN services use today.

Since 2000, NTT's ISDN offering have been known as [[:ja:フレッツ|FLET's]] ISDN, incorporating the "FLET's" brand that NTT uses for all of its ISP offerings.

In Japan, the number of ISDN subscribers dwindled as alternative technologies such as [[ADSL]], [[cable Internet access]], and [[fiber to the home]] gained greater popularity. On November 2, 2010, NTT announced plans to migrate their backend from [[PSTN]] to the [[IP network]] from around 2020 to around 2025. For this migration, ISDN services will be retired, and fiber optic services are recommended as an alternative.<ref>{{cite web | location = JP | url = http://www.ntt-east.co.jp/release/1011/pdf/101102a_1.pdf | language = ja |script-title=ja:PTSNのマイグレーションについて～概括的展望～ | date = November 2, 2010 |website=NTT East | access-date = June 20, 2014 | archive-url = https://web.archive.org/web/20120421021236/https://www.ntt-east.co.jp/release/1011/pdf/101102a_1.pdf | archive-date = April 21, 2012 | url-status = dead }}</ref>