Battery feed for telephone line cards
Battery switching in a telephone subscriber line interface circu
Battery switching subscriber loop interface circuit
Battery-feed circuit for exchange
Biasing arrangement for optimizing DC feed characteristics...
Bidirectional adaptive voice frequency repeater
Bipolar pulse forming line
Bridge for a network interface unit
Broadband driver circuit
Building entrance box with integrated flexible grounding
Building entrance terminal
Call eavesdropping arrangement
Call processing using previously obtained line characteristics
Call related information reception using sigma/delta modulation
Caller ID circuit powered through hookswitch devices
Caller identification transmit path limiter
Canceller trained echo suppressor
Capacitor cancellation method and apparatus
Central office interface techniques for digital subscriber...
Central office interface techniques for digital subscriber...