Thursday, July 15, 2021

Testing Polarity on BiDirectional QSFP

I am adding some switches to an existing network using 40/100 QSFPs. Normally, I would just look to see which side of the fiber has light, shut one port or the other, connect the cable, and bring the port back up during a maintenance window.

With the bi-directional QSFPs, both sides have light, but the polarity still matters. I'm using patch panels so I can't just make sure 1 goes to 1 and 2 goes to 2.

I really don't want to have to come in at midnight to plug in some cables. Any ideas?



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