3Com (3C510503) Expansion Module

Slide-in RI/RO expansion modules allow main ring connections to 20 hubs in different locations from each other. Slide-in RI/RO expansion modules are available in fiber, copper, and copper/fiber, providing flexibility depending on your wiring configuration requirements. And for connectivity between 3Com CoreBuilder 2500/6000, ONline, ONsembler and SuperStack II Hub TR hubs, slide-in copper or fiber ONtrunk modules are available for seamless integration. This is the Fiber RI/RO Module with 4 fiber ST ports.