telephone exchange

any equipment that establishes connections between telephones / the rooms housing such equipment

Japanese Meaning

電話間の接続を確立する装置または設備 / その装置・設備が設置された部屋や局

The old telephone exchange in the basement finally stopped connecting calls after decades of service.

地下にある古い電話交換機は、数十年の稼働の後、ついに通話の接続を停止しました。

Sense（1）

any equipment that establishes connections between telephones

Sense（2）

the rooms housing such equipment

telephone exchanges

（ plural ）