12
3Com recommends that the cable (B) between the Fast 
Ethernet hubs is no longer than 5m (16.4ft). This allows the 
maximum hub-to-workstation cable length (A or C) of 100m 
(328ft) to be used, as shown in Figure 3.
Figure 3   
Configuration Rules and Example of a Fast Ethernet 
(100Mbps) Network
Ethernet (10Mbps) Configuration Rules
You can connect a maximum of four Ethernet (10Mbps) 
hubs in series between workstations, or between a 
workstation and a non-repeater piece of equipment (such as 
a switch). Each cable must not exceed 100m (328ft). An 
example is shown in Figure 4.
Figure 4  
Example of an Ethernet (10Mbps) Network
5m (16.4ft)100m (328ft) 100m (328ft)
Dual
Speed
Hub 8
100Mbps
Hub
Example:
BCA
Hub Hub
Workstation
Workstation
Workstation
Workstation
Switch
100Mbps
link