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