Device Configuration2-4CSX WPIMsWAN RedundancyFor a redundant wide-area connection, one of the WAN interfaces on yourCSX400 can be configured as a primary link, with the other interface designatedas the backup. If the primary link should fail for some reason, the other WANinterface will take over as the wide area link until the primary is restored.When a WPIM-S/T is installed as the backup interface, that connection willactivate and provide an ISDN connection to the wide area network, if the primaryWAN link fails. The ISDN WPIM can also provide backup for single or multipleData Link Connection Interfaces (DLCIs). If a leased line loses a DLCI or a remoteoffice, for example, the WPIM-S/T will restore a 64K connection for that site whilethe rest of the connections remain on the leased line. For more information onWAN redundancy and the WPIM-S/T, consult your QuickSET documentation oryour hardware documentation.CSX WPIMsThe following Cabletron WPIMs provide WAN connectivity for the CSX400,HSIM-W84, and the CSX200 series. Note that currently only the WPIM-SY andWPIM-T1 can be managed on a CSX with SPMA. For all other WPIMs,configuration can be done with the QuickSET application that was shipped withyour device. Consult your QuickSET documentation for more details.Chapter 4, CSX WAN Configuration, describes how to configure the T1 andsynchronous WPIMs, including Frame Relay and PPP protocol configuration. Ifthere is a specific device from the CSX200 series that supports the WPIM, it isnoted below. Otherwise, the WPIM can be special-ordered and installed in ageneral CSX200 (contact the Cabletron Systems Global Call Center for moreinformation).WPIM-DDS DDS is Digital Data Services, a digital network thatsupports data rates of 56Kbps or 64Kbps. The DDSNOTEIf you are using SPMA in a stand-alone mode or in conjunction with the SunNetManager or Solstice Enterprise Manager platforms, the RMON option will be availablefor your CSX400, whether or not you have purchased the RMON application module. Ifyou are using SPMA in conjunction with HP Network Node Manager or IBM NetViewAIX, however, the RMON option will only appear when the module has been purchasedand installed.NOTEThe WPIM-S/T is designed for WAN ISDN redundancy only and is not intended to beused for a primary WAN connection at this time.