Black Box LH1500 Media Converters
Installation and User Guide (08/05)
31
which indicates a fiber cable length of about 40 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 LH1500s and
fiber in this case did not gain allowable maximum cable distance vs. TP cable without the
LH1500s.
Consider a more typical use of Black Box LH1500s in a shared Fast Ethernet
segment. A stack of Fast Ethernet hubs comprises the only repeater in the collision
domain, and the users and servers in the local workgroup are each connected via
Category 5 twisted pair cable, a maximum of 30 meters (100 ft.) in length. It is desired
to connect one remote user with a fiber NIC via fiber cable, using a LH1500 in the
circuit. How long can the fiber cable be?
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