LandOfFree - US Patents - Listing for Telephonic communications,Subscriber line or transmission line interface

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

Backup power supply at subscriber terminal

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit

Balance network directional coupler system and method

Telephonic communications – Subscriber line or transmission line interface – Protective circuit

Balanced heat coil protector

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit

Balanced hybrid circuit

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit

Balanced phase splitting circuit

Telephonic communications – Subscriber line or transmission line interface – Protective circuit

Balancing resistor and thermistor network for telephone circuits

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

Battery boosted dial memory

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

Battery feed circuit

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

Battery feed circuit

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

Battery feed circuit for a pair of subscriber lines

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

Battery feed circuit for a telephone system

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

Battery feed circuit for supplying feed current to telephone set

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

Battery feed for telephone line cards

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

Battery switching in a telephone subscriber line interface circu

Telephonic communications – Subscriber line or transmission line interface – Power supply

Battery switching subscriber loop interface circuit

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

Battery-feed circuit for exchange

Telephonic communications – Subscriber line or transmission line interface – Power supply

Biasing arrangement for optimizing DC feed characteristics...

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

Bidirectional adaptive voice frequency repeater

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

Bipolar pulse forming line