System and method for providing power over a home phone line...
System including an alternate power source for a...
Telecommunications gateway and method
Telephone
Telephone line-powered power supply for ancillary equipment...
Telephone system with controllable ringing voltage
Telephone system with current regulation in the constant...
Tracking switchmode power converter for telephony interface...
Tracking switchmode power converter for telephony interface...
Voice notification for a battery alarm in a network...
Voltage alternating switch circuit
Voltage reference filter for subscriber line interface circuit
Wire bound telecommunications device and a power supply circuit