Cabletron Systems MMAC-Plus 9T125-24 User Manual

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

Contents

Cabletron Systems MMAC-Plus 9T125-24 User Manual Manual pdf 22 page image

Operation3-4System Management BusesThere are two management channels within the SmartSwitch 9000 system: theSMB-1 and the SMB-10. These buses provide out-of-band management and inter-module management communication.SMB-1 BusThe SMB-1 is a 1Mbs management bus located within the SmartSwitch 9000. Thisbus is utilized by all diagnostic controllers in the system including connectivitymodules, power supply modules and the environmental module. The SMB-1transports inter-chassis information between system components, such as powerand environmental information, as well as diagnostic messages. Periodicloop-back tests are performed by all modules which share this bus to ensure thevalidity of SMB-1. In the event a failure is detected on SMB-1, the SMB-10 may beused as an alternate communication channel.SMB-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 9T125-24 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 9T125-24 have been designed so that inthe event of a diagnostic controller fault, the modules will continue to function.