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>I understand that you came to the conclusion that network problems arise only when a single switch is involved; but with normal functioning of the switch, a user on one switch port should not interfere with a user on another switch port. It therefore ocurred to me that the conclusion reached might be premature, and should be taken with care.
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>A high-capacity switch should not become "overloaded" if two users connect to it at the same time; a bandwidth bottleneck on an individual cable is the only issue I can think of.
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>But let me see whether I can think of other issues.
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>You might try connecting users' network cables to different switch ports - perhaps one of the ports is damaged, configured for a low speed, or with some other special configuration command.
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I will bring this to the attention of the customer network engineer.

Thank you very much.

>The switch itself might be seriously damaged. Not very likely, I believe (without the switch stopping completely); I estimate the possibility of individual ports being damaged far more likely.
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>And, of course, I might be missing some other network technology which I know about, or which I don't know about; that's why I suggested checking the configuration - or resetting to factory default (only if nothing special has been configured yet).