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 TEKTRONIX 1502C METALLIC TDR CABLE TESTER  US $5,795.00
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 Tektronix 1502C TDR Cable Tester US $5,695.00
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TDR shows positive reflection on Ethernet cable?
That is the same phase as the test pulse. Does anyone know what could be causing this? I do have a machine connected at the other end of the line that should be terminating the cable properly.
You do realise that 99% of people here will have no idea what a TDR is?
I've never even heard of this happening with an ethernet cable but I've seen it once or twice on other transmission lines. Put simply no impedance mismatch, no matter how horrendous, is going to cause a positive echo. Therefore we must be talking about active termination on the host which itself is fairly unusual for ethernet. Are we talking about some super fast ethernet, e.g 10GbE, by any chance? I'm assuming copper cable here - poor transient response in the terminator can cause a positive echo. There are a couple of possible causes for it - either an incorrect (or missing) capacitor on the regulator or an inadequate power supply.
Regardless of the exact cause the fix is simple. Since the terminator is integral to the ethernet port you have a bad port there and it needs to be replaced. There is no other way around it.
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