In order to make the fiber work we need to make sure the fiber cables are crossed.
The reason fiber cabling is crossed is simple: when connecting fiber from one device to another, the fiber strands need to be crossed so that Tx goes to Rx on each end. For this reason, fiber patch cables are crossed, but when you have horizontal cabling, you have two fiber patch cords which cancel each other out.
Patch panel connectors
In order to make sure the fibers get crossed correctly it is important to be consistent with how we connect our patch cables to the panelmount connectors.
The Tx is always connected to the A side on the back, the Rx is always connected to the B side on the back
The left-hand side "Tx" on the SFP always gets connected to the right-hand side on the rear of the Neutrik panel mount labelled as A
The right-hand side "Rx" on the SFP always gets connected to the left-hand side on the rear of the Neutrik panel mount labelled as B
In the Case of an Opticalcon Quad ( NO4FDW-A ), the top pair is connected to the first port and the bottom pair to the second port.
For example, on a Gigacore 10 : top pair is port 9 and bottom pair is port 10.
When using FiberFox or FibreCo Junior the panelmount connector is provided with a pigtail with the labels A and B on the corresponding fiber channel.