Sorry to say, but that is complete BS from the technical point of view. May he should have talked to an electrical engineer first, before writing this BS. The

Sorry to say, but that is complete BS from the technical point of view. May he should have talked to an electrical engineer first, before writing this BS. There are 2 things the quality of an Ethernet cable has an influence: jitter on the cable and signal quality in terms of that the Ethernet frame may be recognized as corrupted has to be repeated, which again comes down to jitter. Jitter is also introduced by the communication that goes on in parallel. As the Ethernet cable has no influence on the data itself (bit flips are covered by the CRC) there can be no influence at the higher layers at. If that would be the case you couldn't trust any communication at all.