共通 きょうつう せん信号 しんごう もうじゃなかったです
kyōtsūsenshin gōmōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 共通線信号網

1. Wasn't a common trunk signaling network.

Past/Perfective
Negative
Polite
Casual Register
Computing