Best viewed in 800x600 resolution. Voltage tests These tests can test for the normal or abnormal presence of signal activity on the cable. Cards can be tested by placing a carrier sense voltage on the bus. This should cease all network traffic. Any variation of the measured voltage indicates that one or more cards are ignoring the carrier signal.
Noise tests Some of the newer hand held fault tools measure noise levels on the cable.
This is the mean voltage read when there is no network activity. It is best to measure this on a system which is down and all workstations are turned off. All rights reserved.