Patent ID: 8249501

Claim:
An apparatus, comprising: a first connector circuit having a first differential amplifier, a first differential signal path, a first capacitor section including a first pair of parallel capacitors capacitively coupling the first differential amplifier to the first differential signal path, and a first DC biasing circuit for imparting a first DC bias to the first differential signal path opposite the first capacitor section; a second connector circuit having a second differential amplifier, a second differential signal path, a second capacitor section including a second pair of parallel capacitors capacitively coupling the second differential amplifier to the second differential signal path, and a second DC biasing circuit for imparting a second DC bias to the second differential signal path opposite the second capacitor section having a different magnitude than the first DC bias when the first and second connector are not connected, the second connector circuit configured for removably connecting to the first connector circuit with the second differential signal path in communication with the first differential signal path; and wherein one or both of the first and second connector circuits is configured for detecting a change in the first or second DC bias and outputting a connection status signal in response to the detected change.