公开(公告)号：AU5599998A

公开(公告)日：1998-07-03

申请号：AU5599998

申请日：1997-12-09

Applicant: ADC TELECOMMUNICATIONS INC

Inventor： SIT ERIC K ,  KELLER JOHN C ,  BROWN JEFFREY O ,  MELINE RUEBEN W ,  DANZINGER LEAH E ,  BLUBAND ZAKHARY ,  ORTBERG TODD C

IPC: H03F1/52

Abstract: An amplifier switch controller is provided for use in a headend cable transmission system having first and second amplifiers and amplifier input and output paths connected to one of the first and second amplifiers, which becomes the currently activated amplifier. The amplifier switch controller comprises an input sampler for sampling a combined signal on the input signal path and measuring an input signal level. The amplifier switch controller also comprises an output sampler for sampling the amplified combined signal on the output signal path and measuring an output signal level. A program means receives the input and output signal levels and determines whether the currently activated amplifier is not functioning properly. If it is not functioning properly, the program means generates a control signal to a switch. In response to the control signals, the switch disconnects the input and output signal paths from the currently activated amplifier and connects each of the input and output signal paths to the other one of the first and second amplifiers.