That’s not to say that once the fiber network is certified, up and running that you won’t test the throughput capability of a channel, but that is a test of actual connection speed—not the bandwidth of the cable itself. And if your insertion loss is still in compliance and your network isn’t performing, it’s probably worth breaking out the to check the reflectance of events on the link. If both loss and reflectance are OK, the problem is most likely with the active equipment—not the cabling. If you do have a loss problem, then it’s time to troubleshoot.
In short, insertion loss plus length is nearly always what will determine application support, but there may be occasions when you need to add reflectance (Tier 2 testing). That’s why the standards define only those two tiers of field testing – there really isn’t a need for more.
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