Method and apparatus for providing feeder cable insertion loss detection in a transmission system without interfering with normal operation
US6873827B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1998 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Mar 3, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W24/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for measuring a change in the insertion loss of a transmission line in a communication system is disclosed. The method provides feeder cable insertion loss detection in a transmission system without interfering with normal operation. The method includes injecting a non-interfering signal at a predetermined frequency onto a cable providing normal operating signals to a narrowband device at a predetermined frequency, measuring the amplitude of the injected signal, measuring the amplitude of a reflected signal, the injected signal being reflected by the narrowband device and processing the amplitude of the injected signal and the amplitude of the reflected signal to derive a current insertion loss for the cable. In addition, the method further includes comparing the current insertion loss to a prior insertion loss and determining the cable to be defective when the current insertion loss differs from the prior insertion loss by a predetermined amount and replacing the cable when the current insertion loss differs from the prior insertion loss by the predetermined amount. The injecting further includes selecting a signal for injection having a frequency and power …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.