noun
usable distance; maximum transmission distance
Technical term in fiber optics and networking, referring to the maximum distance over which a signal can be transmitted effectively.
この光ファイバーの使用距離は約10キロメートルです。
The usable distance of this optical fiber is about 10 kilometers.
Compound of 使用 (shiyō, 'use') and 距離 (kyori, 'distance').