Cabletron Systems 9E138-36b - Manual (Page 23)

3-3
Operation
System Diagnostic Controller
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 Ethernet MicroLan Switch Modules 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
independently of each other if needed, they exchange information about each
other’s 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 Environmental Module. The Ethernet
MicroLan Switch Modules have been designed so that in the event of a diagnostic
controller fault, the modules will continue to function.
DC/DC Converter
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.
FNB Interface
SmartSwitch 9000 modules are designed with one of two attachment policies. One
allows dual attachment of a module to either FNB-1 or FNB-2; the second allows
dual attachment to both FNB-1 and FNB-2. The Ethernet MicroLan Switch
Modules have one dual attachment to the FNB backplane, connecting to either
FNB-1 or FNB-2. The module can insert into the FNB or bypass it. These flexible
configuration options make the SmartSwitch 9000 ideal for networks designed to
Bridge/Route multiple lower speed LANs to FDDI and/or networks designed
using an FDDI collapsed backbone.