Patent ID: 6282236
Filing Date: 2001-08-28
Classification: H04L

Abstract:
A modem, comprising:modulator circuitry for modulating an input data stream with a carrier signal to produce a first modulated signal, wherein said carrier signal is generated by an oscillator circuit;an amplifier coupled to said modulator circuitry for amplifying said first modulated signal and outputting a second modulated signal, wherein said amplifier outputs a monitor signal when said amplifier is outputting said second modulated signal; anda protection circuit coupled to said amplifier and to said oscillator circuit, said protection circuit including a timer having a duration, said timer being triggered by receipt of said monitor signal, wherein said protection circuit outputs first and second signals when said amplifier outputs said monitor signal for a time longer than said duration of said timer, said first signal disabling said amplifier and said second signal disabling said oscillator circuit.