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Designing and Expanding the Network 2 - 11
Figure 2-2. Unshielded Twisted Pair Network
While there is no fiber in the configuration in Figure 2-2, you can calculate
the fiber equivalent distance as follows:
Total link distance: 100 m + 100 m + 100 m + 50 m + 20 m = 370 m
Total equivalent distance of the Security Modules: (4 * 420 m) + (4 * 165 m) =
2340 m (signal externally enters four Twisted Pair Modules: 4 * 420m)
(signal enters four Twisted Pair Modules from the backplane: 4 * 165 m)
Total equivalent distance: 370 m + 2340 m = 2710 m
Since the total equivalent distance (2710 m) is less than 4200 meters, this example is
a legitimate configuration.
Patch Panels
Patch panels weaken signals that pass through them, thereby reducing
achievable link distances. 3Com assumes the use of one patch panel in the
100 meter link distance calculations specified in this manual. However, each
additional patch panel in the link reduces the 100 meter link distance by
approximately 10 meters.