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Designing and Expanding the Network 2 - 9
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Figure 2-1. Sample Configuration Distance Calculation
Use the following steps to determine whether your network configuration
is legal:
1. Begin with 4.2 km (4200 m) since this is the maximum network
diameter for a pure fiber network (Rule 3).
2. Subtract 100 m for the signal exiting the Fiber Modules in
concentrators A and C (2 * 50) and 280 m for the signal entering the
Fiber Modules in concentrators C and B (2 * 140) as explained in Rule
4 and defined in Table 2-2.
3. Subtract 420 m of fiber equivalent distance for the signal entering the
10BASE-T Module in concentrator A and 165 m for the signal exiting
the 10BASE-T Module in concentrator B (Rule 4).
4. Subtract all cable lengths between the two transceivers and if the
result is greater than zero, the configuration is within legal Ethernet
limits (Rule 5).