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Black Box LH1500 Media Converters Installation and User Guide (08/05)
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the use of fiber media, but not to gain distance by facilitating use of fiber media instead
of twisted pair.
As a sample calculation, consider the question of what fiber cable distance
(connected by a pair of Black Box LH1500 on each end) can be obtained that will
interconnect two 100Mb hubs where the twisted pair cables to the user nodes are 10
meters in length. The solution is :
512 = total available Bit Times in a collision domain diameter,
minus 100 BT for two DTEs on each end leaves 412 BTs,
minus 180 BT for two Class II repeaters leaves 232 BTs,
minus 20 BT for two 10-meter TP cables for hubs to users leaves 212 BTs,
minus 10 BT for two short TP cables from the hubs to 15E’s leaves 202 BTs,
minus 160 BT for two Black Box LH1500 leaves 42 BTs for fiber cable,