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FT14 and FT14H 10Mb Media Converters Installation and User Guide (09/04)
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5.
The LINK LED corresponding to the fiber port on the front of the product will illuminate
(for standard non-Link-Pass-through models) when a proper connection has been
established at both ends (and when power is ON in the units at each end). If LINK is not lit
after cable connection, the normal cause is improper cable polarity. Swap the fiber cables
on the product connector to remedy this situation.
6.
For the Link Pass-through model, connection is the same except that the LINK indication
will not be present unless LINK is made for the cables on both sides.
3.6.3 Power Budget Calculations for Fiber Media Magnum FT14-series
Receiver Sensitivity and Transmitter Power are the parameters necessary to
compute the power budget. To calculate the power budget of different fiber media
installations, the following equations should be used:
OPB (Optical Power Budget) = P
T
(min) - P
R
(min)
where P
T
= Transmitter Output Power, and P
R
= Receiver Sensitivity
Worst case OPB = OPB - 1dB(for LED aging) - 1dB(for insertion loss)
Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km]
where the “Cable Loss” for 62.5/125 and 50/125
µm
(M.m) is 2.8 dB/km,
and the “Cable Loss” for 100/140 (Multi-mode) is 3.3 dB/km,
and the “Cable Loss” for 9/125 (Single-mode) is 0.5 dB/km