The S22 Single 2x2 switch is a standard 2x2 configuration with 4 fiber endpoints and 2 sides. See Switch Overview for detailed information common to all Luminos switching products.
The following diagrams show the optical connections for the different states. The numbers identify the fiber endpoints.
An Extra Optical Gap
It is important to note that the optical path from 1 to 4 in state 1 has two optical gaps and therefore twice the insertion loss.