IBM PC Server 520 User Handbook Manual page 153

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