Cabletron Systems 9000 manual Operation, Chapter, 1. GNIB Packet Flow

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.

Gigabit

Optic

Port

Gigabit

Optic

Port

GNIB

GNIB

i960 Processor

Smart

Switch

ASIC

Diagnostic

Controller

DC/DC

Convertor

INB

NIB

SMB 1

SMB 10

1

INB

2

Figure 3-1. GNIB Packet Flow

3-1