Power Budget Calculation For P62F Fiber Media - GarrettCom Magnum P62F Series Installation And User Manual

Magnum P62F-Series Ethernet Switches
core and the core plus the cladding respectively). Single-mode fiber allows full bandwidth at
longer distances, about 20Km with the single-mode SC.
The same procedures as for multi-mode fiber apply to single-mode fiber connectors.
Follow the steps listed in Section 3.2.2 above.
3.2.5 Power Budget Calculations for P62F Fiber Media
Receiver Sensitivity and Transmitter Power are the parameters necessary to compute
the power budget. To calculate the power budget of different fiber media installations using
Magnum products, the following equations should be used:
OPB (Optical Power Budget) = P (min) - P
T
where P = Transmitter Output Power, and P
T
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
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
The following data has been collected from component manufacturer's (HP's and Siemens') web
sites and catalogs to provide guidance to network designers and installers.
Fiber Speed, Std. km Wave-
Port fdx length
Mode
Std.
Module (hdx) nm
P62F- 100Mb Multi- 2 1300 62.5/125
mode (0.4)
FX
xMSC
100Mb Single- 20
P62F-
1300
FX mode (0.4)
xSSC
100Mb Single-
40
"Long
1300
FX mode
(0.4)
Reach"
* Note: The use of either multi-mode or single-mode fiber to operate at 100Mbps speed over
long distances (i.e., over approx. 400 meters) can be achieved
factors are both applied:
•
The 100Mb fiber segment must operate in full-duplex (FDX) mode, and
•
The worst-case OPB of the fiber link must be greater than the fiber cable's passive
Attenuation.
(Attenuation = Cable loss + LED aging loss + Insertion loss + safety factor)
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Installation and User Guide (11/01)
(min)
R
= Receiver Sensitivity
R
µm
(m.m.) is 2.8 dB/km,
Cable X'mitr R'cvr Worst Worst* typical
Size Output Sens. OPB, distance OPB,
µ µ µ µ m
P dB P dB dB Km, fdx
T , R ,
-20 -31 9.0 2.5
50/125 -23.5 -31 5.5 2.0
9/125 -15 -31 14 28
9/125 -5 -34 27 54
only
if the following
17
typical*
distance
dB Km, fdx
14 5
12 4
17.5 35
32.5 65