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3-1
Chapter 3
Operation
The 9G421-02/9G429-02 module is a two-port Gigabit Ethernet device. Two front
panel gigabit Þber optic ports provide connectivity through SC connectors.
As shown in Figure 3-1, Gigabit Network Interface Blocks (GNIBs) convert data
packets received from the gigabit optics port into a canonical frame format before
forwarding to the SmartSwitch ASIC. The Internal Network Bus Network
Interface Block (INB NIB) converts data packets received from the INB into a
canonical format before forwarding to the SmartSwitch ASIC.
Figure 3-1. GNIB Packet Flow
i960
Processor
GNIB
GNIB
Smart
Switch
ASIC
INB
NIB
DC/DC
Convertor
Diagnostic
Controller
INB
1
2
Gigabit
SMB 1
SMB 10
Optic
Port
Gigabit
Optic
Port