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Magnum14E Media Converters Installation and User Guide (10/02)
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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 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 14E’s leaves 202 BTs,
minus 40 BT for two Magnum 14Es leaves 162 BTs for fiber cable,
which indicates a fiber cable length of about 160 meters.
It is obvious that using twisted pair wiring to connect the hubs would enable the interconnect
length to be the 100 meters maximum for twisted pair media, and this would still leave about a
hundred BTs as a safety margin. In other words, use of 14Es and fiber in this case did not gain