1. Pulse dialing phones operate by momentarily opening the telephone circuit , blocking all current. 2. Usually, noise means audible noise, in audio systems, broadcast systems or telephone circuits . 3. Previously paper-insulated cable had only been applied for low-voltage telegraph and telephone circuits . 4. Some customers installed conditioned telephone circuits for constant higher-speed access. 5. "Maybe it's like the way telephone circuits become busy every year during the holidays," 6. On August 15, 1975, two explosions slightly damaged a turbine and destroyed a telephone circuit . 7. Each twisted pair line provides a single telephone circuit or local loop to a customer. 8. Until recently echo cancellation only needed to apply to the voice bandwidth of telephone circuits . 9. This basic telephone circuit was known as a Buzzer, or more commonly, a Condenser Telephone Circuit. 10. Windstream Communications provides telephone service both over VoIP and conventional telephone circuits to the Lincoln area.
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