Cabletron Systems SmartSwitch 9000 User Manual

Also see for SmartSwitch 9000: Reference guide Appendix Appendix Appendix User guide

Contents

Cabletron Systems SmartSwitch 9000 User Manual Manual pdf 25 page image

3-5OperationSMB-10 BusThe SMB-10 is a 10Mbs management bus located within the SmartSwitch 9000which is also used for inter-chassis communication of modules as well as servingas an out-of-band management channel into the SmartSwitch 9000. The SMB-10 isexternalized from the chassis via an optional Ethernet Port Interface Module(EPIM) located on the front of the Environmental Module. Through an EPIMconnection, full SNMP management of the SmartSwitch 9000 is available out-of-band from user data. Modules which share the SMB-10 bus periodically send outloop-back packets to ensure the validity of SMB-10. In the event a fault is detectedon the SMB-10, the SMB-1 can be used as an alternate communication channel bythe modules.System Diagnostic ControllerThis diagnostic controller is composed of a Z-80 microprocessor and itssupporting logic. The diagnostic controller is designed to control the power-upsequencing of modules, monitor the 9T122-08 input and output powerparameters, keep watch over the main host processor, as well as monitor thetemperature and control the SMB LANVIEW diagnostic LED. Although thediagnostic controller and the main host processor can operate independent ofeach other if needed, they exchange information about each others status andoverall module condition. The information gathered by the diagnostic controlleris available to the network manager via local/remote management and the LCDlocated on the environment module. The 9T122-08 have been designed so that inthe event of a diagnostic controller fault, the modules will continue to function.DC/DC ConverterThe DC/DC converter converts the 48 VDC on the system power bus to thenecessary operating voltages for its host network services module. The diagnosticcontroller controls the operation of the DC/DC converter.FNB InterfaceSmartSwitch 9000 modules are designed with one of two attachment policies. Oneallows a module to dual attach to either FNB-1 or FNB-2; the second allows dualattachment to both FNB-1 and FNB-2. The 9T122-08 has one dual attachment tothe FNB backplane, connecting to either FNB-1 or FNB-2. The module can insertinto the FNB or bypass it. These flexible configuration options make theSmartSwitch 9000 ideal for networks designed to Bridge/Route multiple lowerspeed LANs to FDDI and/or networks designed using an FDDI collapsedbackbone.