US Patent 8417113 Auxiliary network for fiber optic system health management

In an embodiment, an apparatus comprises a switch configured to control bi-directional communication in a first channel of a fiber optic network between the switch and a number of devices and in a second channel of the fiber optic network between the switch and a number of health assemblies in the number of devices. The fiber optic network comprises a number of lines, each line connecting one of the number of devices to the switch. Each health assembly is configured to send and receive a number of optical signals in the second channel.