From personally installing thousands of Data cable runs & utilizing pretty much most manufacturers of cable & terminating materials (even mix & match CAT 5/5e, STP,eternet,Type 1,Twinax w/ baluns, polished & mechanical fiber ends).
***From past experience try to keep your network cabling close to standards & just never recycle patch panels or jacks.***
On four separate occasions with different customers-they had me use patch panels they pulled out from somewhere else. Nothing but intermittent problems. I had them supply me new parts & evrything has been fine.
If you are involved in a new entity or office space with the cabling left intact, spend the money & have it re-tested & then go with it***
Now there are the ISO manufacturing certifications for quality & specs so the quality should be there. I have had to replace a few of the older manufacturers'jacks that have PCBs on them. On some jobs years ago we would have to switch out jacks to Cert them.
The biggest factor is the quality of the installers & the service technicians workmanship.
As the materials go I have used a very basic manufacturer AllenTel as a house brand for over 10 years. I have never replaced a single cable, jack or patch panel due to degrading service (Even in retail & campus applications where the distances have failed the initial tests- but the customer was not willing to spend the money on fiber.They know which cable locations they are & monitor any performance issues- most of their problems have been due to NICs or power surges at the device end when they didn't have an UPS on it. I still service these same accounts & would definitly hear of any problems.
Too many times I have gone into sites with problems that should of never happened. Due to other contractors poor workmanship. Not following what has been basic standards & codes or, performed inhouse by IT or maintenance personnel. It makes you sick, because everyone wants to be everything to bosses/customers anymore.
Steve
tele-dataservices.com