Method of providing d.c. feed to a telephone line

Method of reconstructing an analog signal, particularly in digit

Method of regulating power transfer across an isolation barrier

Methods and apparatus for a bridge tap moderator

Methods and apparatus for controlling echo suppression in commun

Methods and apparatus for improved echo suppression in communica

Methods and apparatus for providing an auxiliary communication l

Methods and apparatus for providing comfort noise in communicati

Midspan power delivery system for reduced emissions

Mode-dependent, multiple bias-driven battery switch for...

Modem data access arrangement without diode bridge

Modem having a digital high voltage isolation barrier

Modem line connection circuit and the control circuit

Modem loop current detect system to detect an off-hook condition

Modular device for telephone network interface apparatus

Modular layered network interface unit

Modular layered network interface unit having improved cable dre

Modular layered network interface unit particularly suited for s

Modular layered network interface unit particularly suited to a

Modular network interface device