AFBR-811RxyZ Tx/AFBR-821RxyZ Rx is used with round multi-lane cable assemblies for applications requiring multiple turns of the jumper cable inside the chassis.
AFBR-811FxyZ Tx/AFBR-821FxyZ Rx is used with flat ribbon cable assemblies, allowing dense tiling of the modules as the jumper cables can be thread under the dust-cap of the next module. This top mounted optical connection maximizes board layout density by eliminating board space lost to the optical connector and strain relief.