Custom Dual 1x2 Fiber Optic Switch
The custom dual 1x2 optical switch is two single 1x2 switches in one switch with
an extra path in state 1.
The following diagrams show the optical connections for the 2 states. The numbers
identify the fiber endpoints. If looking at it as 2 single 1x2s, fibers 1, 6 and
5 make up one single 1x2 while fibers 4, 2, and 3 make up the other.
This optical switch is labeled custom because of the extra path between 5 and 2
in state 1. In many applications, this extra path has no effect and in some cases
can even be used for monitoring. Since this switch has a lower cost than the normal
dual 1x2 (D12N), it may be worth considering if your application can handle the
An example of how a device can monitor itself on the secondary path of a D12C in
For more information, see Switch Overview for information that applies to all switch products.