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Black Box LH1500 Media Converters Installation and User Guide (08/05)
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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 90 BT for one Class II stackable repeater leaves 322 BTs,
minus 30 BT for one 30-meter TP cable from hub to user node leaves 292 BTs,
minus 5 BT for a short TP cable from the hub to 15E leaves 287 BTs,
minus 80 BT for one LH1500 leaves 207 BTs for fiber cable,
which indicates a fiber cable length of about 200 meters
.