Cabletron Systems 9000 User Manual

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

Cabletron Systems 9000 User Manual Manual pdf 26 page image

Operation3-2System Management BusesThere are two management channels within the SmartSwitch 9000 system: theSMB-1 and the SMB-10. These buses provide side-band management and inter-module management communication.SMB-1 BusThe SMB-1 is a 1 Mbps management bus located within the SmartSwitch 9000.This bus is utilized by all diagnostic controllers in the system, includingconnectivity modules, power supply modules and the environmental module.The SMB-1 transports inter-chassis information between system components,such as power and environmental information, as well as diagnostic messages.Periodic loop-back tests are performed by all modules that share this bus toensure the validity of SMB-1. In the event a failure is detected on SMB-1, theSMB-10 may be used as an alternate communication channel.SMB-10 BusThe SMB-10 is a 10 Mbps management bus located within the SmartSwitch 9000.This bus is used for inter-chassis communication of modules as well as serving asa side-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 that share the SMB-10 bus periodically send outloop-back packets to ensure the validity of SMB-10. If a fault is detected on theSMB-10, the SMB-1 can be used as an alternate communication channel by themodules.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 9G421-02/9G429-02 input and output powerparameters, keep watch over the main host processor, monitor the temperature,and control the SMB LANVIEW diagnostic LEDs. Although the system diagnosticcontroller and the main host processor can operate independently of each other ifneeded, they exchange status information and overall module condition. Theinformation gathered by the diagnostic controller is available to the networkmanager via local/remote management and the LCD located on the environmentmodule. The 9G421-02/9G429-02 is designed to continue functioning in the eventof a diagnostic controller fault.