Cabletron Systems 9F122-12 User Manual

Also see for 9E531-24: User guide

Contents

3-3Technical OverviewSMB-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,which 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 9E531-24 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 other’s 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 Environmental Module. The 9E531-24 has been designed so that inthe event of a diagnostic controller fault, the 9E531-24 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 monitors and controls the operation of the DC/DC converter.