Determining the direction of light propagation

In IBM® applications, light travels (propagates) in only one direction within each fiber. The direction of light propagation must be considered when installing and connecting jumper and trunk cables. The following explains how to determine this direction for links that use trunk and IBM jumper cables.

The cables and connectors for the coupling facility channels are industry standard parts, and may not be supplied by IBM. Consult the manufacturer's specifications to determine the characteristics of this cable.