How to say “One server in the server rack went down at three in the morning, and the whole call system froze.” in Japanese

In Japanese

午前三時(ごぜんさんじ)にサーバーラックのサーバーが一台落(いちだいお)ちて、通報(つうほう)システムが全部止(ぜんぶと)まった。

Gozen sanji ni sābā rakku no sābā ga ichidai ochite, tsūhō shisutemu ga zenbu tomatta.