Messages in this thread | | | From | Paweł Dembicki <> | Date | Fri, 29 Mar 2024 10:31:10 +0100 | Subject | Re: [PATCH net-next v2 2/3] net: ethtool: Add impedance mismatch result code to cable test |
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pt., 29 mar 2024 o 03:02 Jakub Kicinski <kuba@kernel.org> napisał(a): > > On Wed, 27 Mar 2024 17:29:13 +0100 Pawel Dembicki wrote: > > This commit introduces a new result code: > > ETHTOOL_A_CABLE_RESULT_CODE_IMPEDANCE_MISMATCH > > which represents the results of a cable test indicating abnormal impedance. > > I'm not a cable expert but going purely by the language > abnormal != mismatch. Mismatch indicates there are two > values we are comparing.
Impedance mismatch can be detected because some parts of the cable may have different (abnormal) impedance, causing reflections at those points. Ethernet cables should have a characteristic impedance of 100 Ohms, so any mismatch from this value is considered abnormal. I can provide a rephrased version if the commit description was not detailed enough.
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