Recovery of previous filter coefficients with smaller capacity m
Reduced contact resistance on a SLIC
Reduction of signal processing requirements in a 2B1Q-code echo
Remote power feed method and system
Remote terminal channel unit for telephone transmission lines
Remote terminal unit connector
Resetting surge protection in telephone line interface circuits
Resistive feed rail generation in a power supply
Resistive line feed circuit
Retrofit interface apparatus and method for remote isolation dev
Retrofit network interface apparatus
Retrofit telephone network interface apparatus
Returning ringing signals through the tip amplifier of...
RF connected message recording device and method for a telephone
Ring boost circuit to extend ringing range of telephone SLICs
Ring relay control unit for foreign exchange station
Ring voltage generation circuit and method for generating a...
Ring voltage termination by means of a spare fuse
Ring-back powered telephone with nonvolatile memory structure
Ring-detect interface circuitry and method for a...