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Designing and Expanding the Network 2 - 27
Note: In the reverse direction, a signal originating at Transceiver
A loses 165 m of fiber equivalent distance when it exits the
10BASE-T Module to which Transceiver B is connected and
330 meters for the signal entering the 10BASE-FL Module in
the bottom concentrator. The overall fiber equivalence of
the path is greater for signals going from Transceiver B to
A, however, the B to A fiber equivalence determines
whether the link meets the 4200 m Ethernet link maximum.
5. Subtract the sum of intervening cable lengths:
185 m + 50 m + 200 m + 1500 m + 100 m = 2035 m
6. The remainder is:
4200 m - 420 m - 230 m - 560 m - 800 m - 2035 m = 155 m
Because the remaining value is greater than zero, the configuration in
Figure 2-9 is legal.