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Designing and Expanding the Network 2 - 13
Figure 2-4. Unshielded Twisted Pair Network Using 24-Port Modules
The equivalent fiber distance can be calculated as follows:
Total link distance: 100 m + 100 m + 100 m + 50 m + 20 m = 370 m
Total equivalent distance of the 24-Port Modules:
4*420m+4*165m=2340 m
(signal externally enters 4 Twisted Pair Modules: 4 * 420 m)
(signal internally enters 4 Twisted Pair Modules from the backplane: 4 *
165 m)
Note: All 3Com 10BASE-T modules (8-Port 10BASE-T Module,
50-Pin 10BASE-T Module, or the 24-Port 10BASE-T Modules)
fall under these same rules.
Total equivalent distance: 370 m + 2340 m = 2710 m
Because the total equivalent distance (2710 m) is less than 4200 meters, this
configuration is legal.