External filter box
Fault protection for integrated subscriber line interface circui
High current protection circuit for telephone interface
High-voltage protection circuitry in a data access arrangement
Hinge shield for network interface enclosure
Integrated ring detection circuit and power cross detection circ
Interface circuit between a subscriber's telephone line and exch
Interface circuit with transient event tolerance
Isolating circuit for telephone apparatus
Lightning protected maintenance termaination unit
Line current protection circuit and method for linear and...
Line interface battery feed arrangements with PTC resistors
Line interface circuit with event detection signaling
Line power control circuit for pay station telephone
Loop current monitor circuitry and method for a...
Method and apparatus for deriving power from a clock signal...
Method and apparatus for monitoring subscriber loop...
Method of regulating power transfer across an isolation barrier
Modem line connection circuit and the control circuit
Modular layered network interface unit