The shooting had been heard over the telephone circuit that Partridge had left open.

Each twisted pair line provides a single telephone circuit or local loop to a customer.

The telephone circuits are scrambled before they leave this office.

Six telephone circuits were needed to send the audio part of the program to New York.

Category 3 cable was suitable for telephone circuits and data rates up to 16 million bits per second.

He studied reflection in telephone circuits (these produced disturbing echoes).

Then it could be somewhere in the telephone circuit outside, or on a wall.

L1 system with capacity of one TV channel or 480 telephone circuits.

"I understand that you require a high-quality telephone circuit."

The first involved getting Recruit into the lucrative business of reselling special telephone circuits to businesses.