Cabletron Systems TRXMIM-24A User Manual

Also see for TRRMIM-2AT: Installation guide

Contents

Cabletron Systems TRXMIM-24A User Manual Manual pdf 55 page image

Configuration SpecificationsPage A-5ManagementFor a management module to fully manage a ring, it requires anetwork-monitoring interface with the ring. Whereas single-ringmanagement modules have only one network interface,port-assigning management modules provide for multiple ringinterfaces, making it possible for a single management module tofully manage any or all of the rings in the hub. (The TRMM-2 canmanage two Token Rings and the TRMM-4 can manage four.) Thisleaves all other hub slots available for concentrator modules,eliminating the power demands of additional managementmodules, and actually reducing the overall cost per port in theMMAC. Meanwhile, port switching increases the number of TokenRings in the hub and makes them easier to access.New TerminologyThe four vertically stacked FNB rings are now referred to as FNBrings 1, 2, 3, and 4. FNB ring 1 is the same ring that has connectedall earlier generation, single-ring MIMs (e.g., TRMIM), and wasaddressed in earlier manuals as “the FNB ring,” or simply “theFNB.” The term “the FNB” now refers collectively to the channelsand connectors of the MMAC backplane’s communications buswhich supports FNB rings, interconnects MIMs, and carries alluser-data.A.5 Configuration SpecificationsSingle-ring MIMs and port switching MIMs are compatible andinterconnectable across FNB ring 1. However, as shown in FigureA-3, single-ring MIMs cannot support communications across FNBrings 2, 3, or 4. If installed in a slot between port switching MIMs, asingle-ring MIM will isolate the additional FNB rings establishedon either side of the single-ring MIM; this configuration is notrecommended. All port switching MIMs should be grouped togetherin the right-most slots of the MMAC as shown in Figure A-3.Single-ring MIMs still have the ability to segment FNB ring 1 (asshown in Figure A-3). They still view the FNB as having only one

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