AGC amplifier for two-wire line conditioner

Amplifier for unshielded twisted pair wire signals

Apparatus for transmitting and/or receiving balanced signals on

Channel interface unit

Channel interface unit

Circuit and method for active termination of a transmission...

Circuitry for telephone systems

Communication system tonal component maintenance techniques

Communications systems

Control of signal transmission

Dialing pulse signature recognizing method and device

Digital circuit for conditional initialization

Digital loop carrier system with enhanced call handling and...

Digital voice transmission having improved echo suppression

Echo canceller

Electromagnetic relay used in a telephone exchange or the...

Electronic feeding bridge for a space division switching network

Enhanced line powered amplifier

Enhanced line powered amplifier

Intermediate amplifier for use in two-wire connections of a dial