https://kids.guinnessworldrecords.com en

First ISDN (Integrated Services Digital Network)

First ISDN (Integrated Services Digital Network)
Who
Fujitsu digital telephone exchange
What
First
Where
Japan
When
April 1985
The ISDN (Integrated Services Digital Network) was first defined as a standard in 1988 by the United Nation's Comite Consultatif International Telephonique et Telegraphique (CCITT). It was one of the first protocols to allow digital transmission of voice and data over copper telephone wires. The first use of ISDN predated the international standard, when in April 1985 a Fujitsu digital telephone exchange was trialled in Japan. It wasn't until 19 April 1988 that NTT offered national ISDN services in Japan – the first major network to do so.