Cabletron Systems MMAC-5FNB Networking Manual

Also see for MMAC-5FNB: Overview and setup guide

Contents

Cabletron Systems MMAC-5FNB Networking Manual Manual pdf 181 page image

Simple Ethernet8-5Expansion - EthernetThese reduce the number of RMIMs we need to consider to two: the TPRMIM-21and TPRMIM-22. As each Ethernet channel needs to support 40 users, and theMMAC-M8FNB chassis has only four full slots which are still unpopulated, wecannot use the TPRMIM-21; the TPRMIM-21, providing a maximum of 11 RJ45ports per module when configured with its optional EPIM would only allow us tosupport 22 users on each backplane channel. The TPRMIM-22, however, provides21 RJ45 ports per module. When the remaining four empty chassis slots are filledwith four TPRMIM-22 modules, two configured to Ethernet Channel B and twoconfigured toEthernet Channel C, all the required station counts are met.No external or additional devices are required for the network to operate. TheEMME will manage all the modules in the chassis, provide repeating for theexisting Channel A modules, and bridge the three backplane channels to oneanother. If an additional connection is required to another chassis or a standalonedevice, the connection can be made through one of the free ports on any of theMIMs, or through the bridged Channel D, the front panel DB15 connectors of theEMME.Incorporating Token RingIf an existing Ethernet network requires connection to a Token Ring network, thetreatment of this need in the chassis depends entirely on the extent to which theexisting Ethernet chassis is required to support the actual operation of the TokenRing network.Adding a separate, standalone Token Ring network to an existing Ethernetnetwork of any style is a simple matter (adding a Token Ring which is bridged toan existing Ethernet network through the chassis is covered later in this section).To provide for the creation and management of the Token Ring network, amanagement module is required. Unfortunately, all the management modules wehave used thus far utilize the first slot in the MMAC chassis, a slot which, in thecase of an existing Ethernet network, is already populated. In order to facilitatethe creation of new networks, a mid-chassis management module is required. TheToken Ring Mid-chassis Management Interface Module, or TRMMIM, is a moduledesigned for that very purpose.The primary purpose of the TRMMIM is to initiate new Token Ring networks onthe FNB backplane bus of the chassis. It is placed in the hub exactly like any othermanagement module, and manages any Token Ring modules that are placed tothe left of it in the chassis. After adding the TRMMIM to the chassis, the creationof a Token Ring network in an existing Ethernet configuration is accomplished inexactly the same manner as that described in the Token Ring configuration sectionof Chapter 6, Token Ring. It is important to note, however, that a Token Ringnetwork configured in this manner will not communicate with the existingEthernet network without the use of an external Ethernet-to-Token Ring bridge orrouter. That does not mean that there is no way to use available MMAC modulesto supply the interconnection of the Ethernet and Token Ring networks.