×

Method and apparatus for providing feeder cable insertion loss detection in a transmission system without interfering with normal operation

  • US 6,873,827 B1
  • Filed: 09/28/1998
  • Issued: 03/29/2005
  • Est. Priority Date: 09/28/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for measuring the insertion loss of a cable having first and second cable ends respectively connected between a signal source and a narrowband device, comprising:

  • injecting a non-interfering signal at a first predetermined frequency outside a frequency band of the narrowband device onto the cable proximate the first cable end, wherein injecting the non-interfering signal occurs contemporaneously with a transmission of normal operating signals to the narrowband device at a second predetermined frequency within the frequency band of the narrowband device;

    proximate to the signal source, measuring an amplitude of the injected signal;

    proximate to the signal source, measuring the amplitude of a reflected signal, the injected signal being reflected by the narrowband device; and

    calculating a current insertion loss for the cable, wherein calculating the current insertion loss includes determining a median of the difference between the measured amplitudes of the injected and reflected signals.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×