光回線ひかりかいせん Noun English jmdict 1 noun (common) (futsuumeishi) optical communications line;optical network
回線かいせん Common Noun English jmdict 1 noun (common) (futsuumeishi) circuit;line この回線の細さじゃ、動画は見られないよ。 This connection is too slow for me to watch movies.