Cabletron Systems 9E133-36 User Manual

Also see for 9E132-15: Appendix

Cabletron Systems 9E133-36 User Manual Manual pdf 22 page image

Operation3-2Flexible Network Bus (FNB)The FNB consists of two dual FDDI networks, the FNB-1 and FNB-2, providingup to 400 Mbps of data bandwidth. These FDDI networks are 100% ANSI FDDI-compliant, supporting SMT (version 7.3), MAC, PHY, and PMD standards. Thisallows the FNB to traverse multiple SmartSwitch 9000 hubs, or connect to anyANSI FDDI-compliant device, through standard A/B port connections.System 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 1 Mbps management bus located within the SmartSwitch 9000.This bus is utilized by all diagnostic controllers in the system. These includeconnectivity 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.Periodicloop-back tests are performed by all modules that 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 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. Non-runtime downloads and BootP downloads also utilize theSMB-10 bus.