The Zinwave Unitivity 5000 Transport Module enables a fiber connection between two Primary Hubs. A set of Transport Modules is required. One connects to the front of the first Primary Hub and the other one connects to the back of the second Primary Hub. Up to 8 Transport Modules can be deployed in the front or up to 4 in the rear. Simultaneous installation in both the front and rear on a single Primary Hub is not supported. Design resembles an Optical Module, but with internal hardware differences to permit it to also perform the job of a Service Module.