Automatic echo cancellation for an integrated services digital n
Automatic gain control apparatus determining echo return loss
Automatic loss control circuit
Automatic loss control circuit
Automatic remote termination sensing and line powering scheme
Automatic reset for DSL lines
Automatic speech recognition using echo cancellation
Backup battery power supply for microprocessor based telephones
Backup power supply at subscriber terminal
Balance network directional coupler system and method
Balanced heat coil protector
Balanced hybrid circuit
Balanced phase splitting circuit
Balancing resistor and thermistor network for telephone circuits
Battery boosted dial memory
Battery feed circuit
Battery feed circuit
Battery feed circuit for a pair of subscriber lines
Battery feed circuit for a telephone system
Battery feed circuit for supplying feed current to telephone set