Parallel split powering

PCM coder and decoder having function of two-wire/four-wire conv

Phone line splitter assembly

Portable telephone set

Positive temperature coefficient thermistor device

Power circuit for telephone accessory devices

Power conservation system for a modem in a computer system

Power feed circuit providing both on-hook and off-hook power for

Power feed for Ethernet telephones via Ethernet link

Power management in a microprocessor-controlled battery-powered

Power saving control apparatus for simple electronic exchange sy

Power supply apparatus and method for energizing telephone alert

Power supply circuit using a constant current and telephone appa

Power supplying system for terminal

Power-limited remote termination converter with wetting...

Power-supply transfer apparatus for telephone

Procedure and device for adaptive digital cancellation of the ec

Process and device for adaptive digital cancellation of the echo

Process and device for adaptive identification and adaptive echo

Process and system for improving echo cancellation within a tran