IBM PC Server 520 User Handbook Manual page 155

10BaseT
Net 1
HUB 1
10BaseT
HUB 2
Net 1
Port 1 Port 2 Port 3 Port 4
Port 1
Port 2
Port 3
Port 4
Net 1
10BaseT
HUB 3
10BaseT
Net 1
HUB 4
Router
Protocol
Virtual Network Layer
LAN Driver
LAN Driver
Port 1 Port 2 Port 3 Port 4
Adapter 2
Adapter 1
VNET VNET
Switch 1 Switch 2
System Bus
10BaseT
Net 2
HUB 5
10BaseT
HUB 6
Net 2
Port 1
Port 2
Port 3
Port 4
Net 2
10BaseT
HUB 7
10BaseT
Net 2
HUB 8