Enterasys 9f106-01 User Manual

 

Operation

3-2

 

The FNB consists of two dual FDDI networks, the FNB-1 and FNB-2, providing 
up to 400 Mbps of data bandwidth. These FDDI networks are 100% ANSI FDDI-
compliant, supporting SMT (version 7.3), MAC, PHY, and PMD standards. This 
allows the FNB to traverse multiple MMAC-Plus hubs, or connect to any ANSI 
FDDI-compliant device, through standard A/B port connections. 

 

The SMB-1 is a 1 Mbps management bus located within the MMAC-Plus. This bus 
is utilized by all diagnostic controllers in the system. These include 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 tests are performed by all modules that share this bus to ensure the 
validity of SMB-1.

 

This diagnostic controller is composed of a Z-80 microprocessor and its 
supporting logic. The diagnostic controller is designed to control the power-up 
sequencing of modules, monitor the 9F106-01 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. The information 
gathered by the diagnostic controller is available to the network manager via 
local/remote management and the LCD located on the Environmental Module. 
The 9F106-01 have been designed so that in the event of a diagnostic controller 
fault, the modules will continue to function.

 

The DC/DC converter converts the 48 VDC on the system power bus to the 
necessary operating voltages for its host network services module. The diagnostic 
controller controls the operation of the DC/DC converter.