Because our media system no longer works like the old system- dedicated wires passing through a central switchboard.

It had no connection with a central switchboard.

"The main artillery dump," Jake answered, and the corporalrelayed his words to the central switchboard.

The brain was no more than a central switchboard, encased in bone and removed from the working surface of the body.

All classrooms were connected by telephone to a central switchboard at the front office.

And they were connected by a wire that ran through a central switchboard.

Intercoms connect each room and there is also a fourth telephone line that rings to the building's central switchboard.

Each room of a building was equipped with a horn attached to a central 'switchboard'.

In the basement the central switchboard had been built into a closet.

It took a few minutes to track her down through the island's central switchboard, but finally he heard Jo's voice: "Hello?"