Central office interface techniques for digital subscriber...
Central office line interface circuit for an analog network priv
Channel interface unit
Channel unit interface circuit
Channel unit interface circuit
Circuit and method for detecting AC voltage pulses
Circuit and method for stimulation of a telephone apparatus
Circuit arrangement for a module in the exchange of a digital TD
Circuit arrangement for generating charge pulses
Circuit arrangement for protecting electronic interface circuit
Circuit arrangement for providing power for an IC chip in a tele
Circuit arrangement for signal and information conversion betwee
Circuit arrangement for the subscriber-remote termination of a s
Circuit arrangement for the transmission of telecommunication si
Circuit board capacitor structure for forming a high voltage...
Circuit compensating for the attenuation of a notch filter at fr
Circuit configuration and chip set for supplying a telephone...
Circuit for controlling an on-hook voltage by the use of a balan
Circuit for echo-cancellation in an asymmetric, two-way...
Circuit for joint transmitting voice and data over a...