3Com 100 TX User Manual

Management Unit 1-3The two expansion connectors are used for adding components (additionalhubs or a Management Unit) to create a hub stack. The LinkBuilder FMS 100-TXHub can be used as a stand-alone repeater or as a stacked unit with otherLinkBuilder FMS 100 Hubs. Stacking units provides the benefit of a higher portcount, with the stack functioning as a single logical repeater. Up to eight units(for example, seven hubs and a Management Unit) can be connected togetherin a stack.The rear panel of the hub provides a three-pronged socket for attaching a100–240 V AC power cord to the hub. Alternatively, power can be suppliedthrough a 3Com Redundant Power System (RPS) connected to the DC inputconnector. Refer to the section “Using the Redundant Power System” inChapter 2 for additional information.A 2 A, 250 V fast-blow fuse is located in the hub’s AC receptacle.You can mount the LinkBuilder FMS 100-TX Hub in a 19-inch standard rack oryou can place it as a stand-alone unit on a desk or table. A rack-mounting kitis supplied with each hub.Management Unit The LinkBuilder FMS 100-TX Hub can support a Management Unit toprovide full SNMP manageability to a hub stack. The Management Unit isdesigned for inclusion in 3Com’s SuperStack family of stackable networkdevices and can also be connected to the Redundant Power System (RPS).If a Management Unit is included in a stack, a maximum of seven hubs isallowed in the stack — that is, one Management Unit plus seven repeatersfor a total of eight components, the maximum number of componentsallowed in one hub stack.Only one Management Unit can be attached to each stack.