Programmable subscriber line circuit partitioned into high...
Programmable subscriber line circuit partitioned into high...
Remote power feed method and system
Resistive feed rail generation in a power supply
Returning ringing signals through the tip amplifier of...
Ring relay control unit for foreign exchange station
Ring voltage generation circuit and method for generating a...
Ringing controller
Silent ringing with reduced device sizes
Speech amplifier-resident mechanism for controllably...
Startup procedure for international line powered DAA
Subscriber circuit for public telephone set
Subscriber line interface circuit
Subscriber line interface circuitry
Supply circuit for supplying a two-wire line
Supply power transition control
System and method for allocating overhead voltage in the...
System and method for distributing power over a premises...
System and method for providing lifeline power service to...
System and method for providing power over a home phone line...