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How to test cables and Ethernet switch

I have a network run to a Gig-E switch in the office area.  Performance is variable.  I notice better performance when connected to the head-end switch that the Gig-E switch is connected to.  This tells me that either the Gig-E switch has a problem, or the head-end port, or the cable in between.

How do I determine where the problem is?  Repeated pings every second show no packet loss and 1ms latency.  What other tests can I use?

Steve Boston
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Norm DickinsonGuruCommented:
Aside from the network testing equipment commonly used for this type of cable testing, running a long patch cord down the hallway often gives a quick and dirty answer to the question of cable integrity. Another approach, to test the switch, is to swap ports and see if the problem migrates.
sgarson1Author Commented:
Good point.  I have such a cable.  Never thought of that!
Norm DickinsonGuruCommented:
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