Enhanced echo canceller for digital cellular application

Enhanced high voltage interface for partitioned subscriber...

Enhanced high voltage line interface circuit

Enhanced low pass filter

Enhanced services network interface device

Enhanced subscriber line interface circuit

Enhanced synchronous rectifier

Environmental noise level estimation apparatus, a...

Exclusionary device for coupling plural telephonic devices to a

Extended feedback circuit for impedance matching and voltage...

External filter box

External resistor and method to minimize power dissipation in DC

External resistor and method to minimize power dissipation...

External resistor and method to minimize power dissipation...

Facsimile apparatus

Fault protection for integrated subscriber line interface circui

Feed arrangement for a subscriber loop with multi-level...

Feeder circuit

Filter arrangement and method for telecommunication device

Filter arrangement for shaping a pulse propagated over POTS...