Operation
System Management Buses
There are two management channels within the MMAC-Plus system: the SMB-1 and the SMB-10. These buses provide out-of-band management and inter-module management communication.
SMB-1 Bus
The SMB-1 is a 1Mbs management bus located within the MMAC-Plus. This bus is utilized by all diagnostic controllers in the system including connectivity 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 test are preformed by all modules which share this bus to ensure the validity of SMB-1. In the event a failure is detected on SMB-1, the SMB-10 may be used as an alternate communication channel.
SMB-10 Bus
The SMB-10 is a 10Mbs management bus located within the MMAC-Plus which is also used for inter-chassis communication of modules as well as serving as an out-of-band management channel into the MMAC-Plus. The SMB-10 is externalized from the chassis via an optional Ethernet Port Interface Module (EPIM) located on the front of the Environmental Module. Through an EPIM connection, full SNMP management of the MMAC-Plus is available out-of-band from user data. Modules which share the SMB-10 bus periodically send out loop- back packets to ensure the validity of SMB-10. In the event a fault is detected on the SMB-10, the SMB-1 can be used as an alternate communication channel by the modules.
System Diagnostic Controller
This diagnostic controller is composed of a Z-80 microprocessor and it’s supporting logic. The diagnostic controller is designed to control the power-up sequencing of modules, monitor the 9F310-02 and 9F315-02 input and output power parameters, keep watch over the main host processor, as well as monitor the temperature and control the SMB LANVIEW diagnostic LED. Although the diagnostic controller and the main host processor can operate independent of each other if needed, they exchange information about each others status and overall module condition. The information gathered by the diagnostic controller is available to the network manager via local/remote management and the LCD located on the environment module. The 9F310-02 and 9F315-02 have been designed so that in the event of a diagnostic controller fault, the 9F310-02 and 9F315-02 will continue to function.
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