Noise testing with the OMNIScanner | Fluke Networks

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Noise testing with the OMNIScanner

The last OMNIScanner left the factory back in July 2005. We regret to say service and support ended July 2009. It's replaced by the Versiv familly of testers.
 
First Action:
Make sure you have the latest firmware in your Omniscanner, as older versions of the firmware did not contain the Noise Detection facility. You can find the latest firmware by clicking here.
 
 
What is Impulse Noise? 
Noise is undesirable electrical energy that falls within the typical Network frequency bands of operation. It interferes with the network's ability to transmit data reliability. Noise sources may include AC transmission lines, fluorescent light fixtures, industrial equipment, copy machines, etc. Noise problems also occur when other wire pairs in the same sheath are used for non-LAN applications (i.e. voice). This sort of noise is typically low frequency.
 
Testing for noise involves turning off all LAN devices and measuring for background electrical activity in the cabling. Often noise problems can be corrected by moving the cable away from the source or by removing the source itself. Different noise sources radiate at different frequencies. By knowing the frequency of the Noise Source, you are better able to pinpoint the cause of the Noise.
 
Impulse Noise Measurements are used for long term monitoring of the network. They indicate spikes of electrical activity that occur at random on the network.
 
 
Impulse Noise Testing with the OMNIScanner 
  • Turn the OMNIScanner on and connect a Link Adapter. The OMNIRemote is not required for this function.
  • From the Main Screen, press the Diagnostics Button .
  • There will be a Menu displayed.
  • Select #4 Impulse Noise from the Menu.
     

     
  • Connect the Link adapter to the Port or Workstation Outlet to be monitored.
  • Press Enter on the OMNIScanner to begin the monitoring process. The current date and time are shown in the upper left. The monitored pair is shown in the upper right.
     

     
  • Impulses/sec indicates the number of wide band impulses that exceed 30mV peak-to-peak that were detected in the last 1 sec interval.
  • Total Impulses indicates the total number of impulses detected since Noise Monitoring was started.
  • Elapsed Time indicates the time since the Monitoring began.
  • Press the Pair Button  to clear the Log and monitor impulse noise on another pair.
  • Press the Detail Button  to open the Log Screen.
     

     
  • OMNIScanner keeps a log during the Impulse Noise Monitoring. The Log represents the seven largest Impulse Noise counts detected with the date and time they occurred.
  • Peak indicates the maximum number of Impulses/Second detected at the logged date and time.
  • Press ESC to exit the Log Screen.
  • Press ESC to exit the Impulse Noise Monitoring.

Author: Adrian Young

Creation Date: 2014-02-27

Last Modified: 2014-02-27

 
 
 
 
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