DO NOT UNDER ANY CIRCUMSTANCES LOOK INTO A FIBER OPTIC END UNLESS YOU KNOW, FOR A FACT, THAT IT IS DE-ENERGIZED!!!!!!!!!!!!!!!!!!!!!
NO kidding, no joke. Doing so can cost you your eyesight.
Single-mode uses wavelengths you cannot see, but are extremely strong and *WILL* burn a permanent line into your retina ... no recovery.
Even with Multimode and visible wavelengths, it is extremely bad practice to look into a fiber optic end ... unless you can see both ends, and neither are connected.
DO NOT, DO NOT, DO NOT look into a fiber optic end.
This also applies to fiber optic equipment (potentially live GBICS, SFPs, or other optical ports. Any unused ports should be plugged, even if the equipment automatically powers the port down on loss of signal ... don't risk your eyesight on some programmer's coding ability ... you know how things go with bugs and other "undocumented features."
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...