Designing and Expanding the Network 2 - 25
To determine if the network configuration in Figure 2-8 is legal:
1. Use 4200 meters as the maximum network diameter as defined by
the 802.3 specification.
2. Subtract the equivalent fiber distance for each 10BASE-FL Module in
the signal path between Transceivers A and B. This equals 330 meters
for Concentrator A and 230 meters for Concentrator B (560 meters
total).
3. Subtract the equivalent fiber distance for each Fiber or Port-Switching
Fiber Module in the signal path. This equals 50 meters for
Concentrator A, 190 meters for Concentrator C, and 140 meters for
Concentrator B (380 meters total).
4. Subtract all fiber cable lengths between the transceivers (450 m +
1000 m + 500 m + 75 m = 2025 meters).
Because the final remaining distance is greater than zero (1235
meters), the network configuration is legal.
Connecting External Network Devices
When connecting Thick or Thin Ethernet segments to an ONline network,
you can use an:
❑ ONline Ethernet Repeater Module
❑ ONline Ethernet Bridge Module
❑ External repeater or bridge
❑ An IEEE Repeater or ONline Repeater Module each have an
equivalent fiber distance of 800 meters
