Chapter 3 Operation - Cabletron Systems MMAC-Plus 9F310-02 User Manual

Operation
The 9F310-02 and 9F315-02 modules are capable of bridging/switching any three,
of five possible interfaces, depending on how it is configured. The INB-1
connection is always fixed. When configuring the module, the decision is made to
connect both front panel ports, both FNB ports, or one front panel and one FNB
port to the bridge.
As shown in Figure 3-1, packets may be received at the front panel FDDI ports,
the FNB rings (FNB-1 and/or FNB-2), and/or the INB-1 bus, according to the user
configuration. These packets are converted into canonical format. The Fast Packet
Switching circuitry decides from header information where the packets should be
sent. They are then converted from canonial format to the proper format for that
interface.
Backplane
Backplane
FNB
A
FNB-1
B
A
FNB-2
B
Fast Packet
Switch Engine
INB
FNB
A
FNB-1
B
A
FNB-2
B
Fast Packet
Switch Engine
INB
Figure 3-1. Configuration Options
A
B
Front
Panel
A
FNB
B
A
FNB-1
B
A
FNB-2
B
Backplane
INB
A
B
Front
Panel
A
B
Chapter 3
A
B
Fast Packet
Switch Engine Front
Panel
A
B
3-1