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Battery feed circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Battery feed circuit for a pair of subscriber lines

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Battery feed circuit for a telephone system

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Battery feed circuit for supplying feed current to telephone set

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Battery feed for telephone line cards

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Battery switching in a telephone subscriber line interface circu

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Battery-feed circuit for exchange

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Bidirectional adaptive voice frequency repeater

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Bipolar pulse forming line

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Reexamination Certificate

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Call eavesdropping arrangement

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Call processing using previously obtained line characteristics

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Canceller trained echo suppressor

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Circuit arrangement for generating charge pulses

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Circuit arrangement for providing power for an IC chip in a tele

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Circuit compensating for the attenuation of a notch filter at fr

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Circuit for monitoring battery voltages of telephone terminal fa

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Circuit for remote supply of subscriber line terminals in a tele

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Circuit for telephone set comprising a light-emitting diode powe

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Combination exterior telephone service terminal and splicing...

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Reexamination Certificate

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Communication system with active noise cancellation

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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