Fibre polarity on LC patch panels - do you need to flip one patch cord pair?
This perhaps a stupid question, but I am unsure if our fibre installation was done right or if I'm just thinking about it the wrong way.
I'm looking for feedback from people who also have fibre patch panels with LC connectors - basically what most switches now come default with.
Do you need to flip polarity on one side of your patch cords with default polarity LC duplex patch cords?
For years we only had the old style ST connectors on the fibre patch panels, since that's what was standard like 15y ago.
As long as they don't break, they will stay installed and they seem to be quite trusty. :-) This kind of connector is simplex only, checking fibre polarity on them is normal procedure then.
I'm not a fibre guy, my normal network connection in 99% of daily work is RJ45 :-)
Now a new fibre run has been added to a building with the nowadays default-style LC connectors. These ports are duplex - I've once seen simplex LC patch cords but they seem to be rather seldom used.
Until now I've never used LC to LC connections other than for switch to switch cabling, no passive coupling in between like a patch panel.
With duplex LC cables I've never had to think default polarity although lots of LC patch cords allow flipping fibre pairs at the connector if you need to (but not all as I've found)
Now with the new install I've realized that using default-polarity patch cables I've had to flip the connectors on one of the 2 ends to get correct polarity.
Is this considered to be normal?
Reading white papers about fibre polarity standards like this one from AMP makes me think that one should not nned to flip pairs but if connections were done right, one should not need to bother about fibre polarity ?