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sbiewald276516dI agree totally: While for "home" cables unshielded wire is usually acceptable, it is often not in businesses.
I recently connected a SAN appliance (for everyone not familiar with it: a storage server with mostly redundant components, requiring a lot of power).
One of the cables for the management interfaces was directly behind the power-supply of it (and those appliances have big power supplies, as single of them must be able to power effectively two servers).
Accidentally I used an unshielded Ethernet cable at first: It was impossible to use the web interface, even the telnet one barely worked.
Took another (S/FTP) cable, it worked like a charm.
Nanos876115dDoes it help if you run the wiring non-parallel to other wiring ?
IntrusionCM77415dShielded cable / CAT 6 and there will be no surprises.
Downtime, worktime for replacement, worktime for EM measurement, worktime for checking cables, worktime for checking transfer... And so on.
There is nothing to gain from cheap cables - except pain.