There are advantages to making and running your own cables in data centers. If project scheduling allows time, the technicians can make and run these cables during their idle time. Testing the cables is simple so that should never be a reason for outsourcing.
Custom made-onsite cables are preferred because they are the correct length and there will not be 30 feet or more of excess cable coiled up causing congestion. Premade cables should be used only for occassional runs and those cases involving definite known run lengths.
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