Translation guide
A set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network.
integrated services digital network
Full Japanese term, less common in everyday use.
このオフィスではまだISDN回線を使っています。
This office still uses an ISDN line.
The full Japanese translation, used in formal or technical documents.
The Integrated Services Digital Network was standardized in the 1980s.
Referring to a physical ISDN connection or subscription.
Means 'ISDN line', the most natural way to refer to the connection.
How can I subscribe to an ISDN line?
Refers to ISDN as a service, often used by providers.
ISDN service has been discontinued in this area.
In Japanese, ISDN is almost always referred to by the English acronym, pronounced アイエスディーエヌ. The full Japanese term 統合サービスデジタル網 is rarely used outside of very formal or historical contexts.