Operation
3-2
System Management Buses
There are two management channels within the SmartSwitch 9000 system: the
SMB-1 and the SMB-10. These buses provide side-band management and inter-
module management communication.
SMB-1 Bus
The SMB-1 is a 1 Mbps management bus located within the SmartSwitch 9000.
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 tests are performed by all modules that 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 10 Mbps management bus located within the SmartSwitch 9000.
This bus is used for inter-chassis communication of modules as well as serving as
a side-band management channel into the SmartSwitch 9000. 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 SmartSwitch 9000 is available out-of-
band from user data. Modules that share the SMB-10 bus periodically send out
loop-back packets to ensure the validity of SMB-10. If 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 9G421-02/9G429-02 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 status information 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 9G421-02/9G429-02 is designed to continue functioning in the event
of a diagnostic controller fault.
