User`s guide

Operation
3-2
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 its
supporting logic. The diagnostic controller is designed to control the power-up
sequencing of modules, monitor the 9M426-02 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 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 environment module. The 9M426-02 has been designed so that in
the event of a diagnostic controller fault, the 9M426-02 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 monitors and controls the operation of the DC/DC converter.
INB Interface
Each module that attaches to the INB has an INB Network Interface Block (NIB).
The INB NIB converts canonical frames to fixed length data blocks for
transmission onto the INB. For data blocks received from the INB, the INB NIB
reassembles the data blocks received from the INB back into canonical frames for
transmission to the SmartSwitch ASIC then from the SmartSwitch ASIC to the
front panel ports.
SecureFast Switch
The SmartSwitch ASIC is a hardware based switch design that is the key building
block of the SmartSwitch 9000. All filtering/forwarding decisions are made in
hardware as opposed to software as in traditional switches. This custom
hardware allows the SmartSwitch ASIC to process over 150K frames per second.
The SmartSwitch ASIC is designed to support up to 64 ports that are shared