Cabletron Systems 9E423-36, Руководство пользователя

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Operation
3-4
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 9E423-36 input and output power
parameters, keep watch over the main host processor, monitor the temperature,
and control the SMB LANVIEW diagnostic LEDs. Although the system diagnostic
controller and the main host processor can operate independently 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 9E423-36 is designed to continue functioning in the
event of a diagnostic controller fault.
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 monitors and controls the operation of the DC/DC converter.
INB Interface
The INB Backplane is designed to transport fixed length data blocks between
modules in the SmartSwitch 9000 using a Time Division Multiplexing (TDM)
design. The SmartSwitch 9000 INB bus delivers 2.5 Gbps of true data bandwidth
with all control and management communication being serviced on the 8-bit out-
of-band bus. The INB can time slice its bandwidth using one of three methods:
• The default method is standard TDM round-robin bandwidth arbitration.
• The second method is for modules to reserve a specific amount of bandwidth
using MONARCH, Cabletron’s INB Bandwidth Arbitrator.
• The third method permits the lowest slot number to use any bandwidth not
used by the previous two methods.