noun
switched line
A telecommunications line that is temporarily established by switching, as opposed to a dedicated line. Used in computing and networking contexts.
交換回線を使うと、通信コストを抑えられる場合がある。
Using a switched line can sometimes reduce communication costs.
専用回線 is a dedicated line that is always connected, while 交換回線 is a switched line that is established on demand.
Compound of 交換 (switching, exchange) and 回線 (line, circuit).