noun
leased line; private circuit; private line
A dedicated telecommunications line rented from a carrier, used for exclusive connection between two points. Common in business and networking contexts.
本社と支社の間は専用回線で結ばれている。
The head office and the branch office are connected by a leased line.
公衆回線 is a public line shared by many users, while 専用回線 is a private, dedicated line.
Compound of 専用 (せんよう, 'exclusive use') and 回線 (かいせん, 'circuit/line').