伝送 でんそう制御 せいぎょ拡張 かくちょうではありませんでした
densōseigyokakuchōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 伝送制御拡張

1. Was not transmission control extension.; Was not a transmission control extension.

Past/Perfective
Negative
Polite
Formal Register