Power Budget Calculations For Quad-Series Qpm's With Fiber - GarrettCom Magnum Quad-Series Installation And User Manual

Magnum Quad-Series Fiber Switches
4.7

Power Budget Calculations for Quad-Series QPM's with 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
where P
Worst case OPB
Wors t 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 (Agilent's and
Siemens') web sites and catalogs to provide guidance to network designers and installers.
Fiber Speed,
Port
Mode
Std.
M odule
QPM 10- 10 Mb Multi-
FST m
FL
QPM- 100Mb Multi-
FX mode
M ST, MSC
100Mb Single-
Q PM-SSC
FX mode
100Mb Multi-
QPM-
FX mode
MTRJ
100Mb Multi-
QPM-
mode
FX
M V45
* Note: The use of either multi-mode or single-mode fiber to operate a
over long distances (i.e., in excess of approx. 400 meters) can be achieved
if the following factors are both applied:
•
The 100Mb fiber segment must operate in full-duplex (FDX) mode, i.e. the
full-duplex (factory default) setting for 100Mbps fiber ports must be used,
and
•
The worst- se O B of t
pa ssive Atte
(Attenuation = C
www GarrettCom com . .
(min) - P
T
= Transmitter Output Power, and P
T
= OPB - 1dB(for LED aging) - 1dB(for insertion loss)
Std. Wave Cable
km -
fdx length
(hdx) nm
62.5/125
2
850 100/140
ode (2)
50/125
2 1300 62.5/125
(0.4)
50/125
18+
1300 9/125
(0.4)
2 1300 62.5/125
(0.4)
50/125
2
1300 62.5/125
(0.4)
ca P h e fiber link must be greater than the iber cable's
n uati o n.
able lo s s + ED aging loss + Insertion loss + safety factor) L
Installation and User Guide (06/03)
(min)
R
= Receiver Sensitivity
R
µm
X'mitr R'cvr Worst
Size Output Sens. OPB,
µ m
P dB P dB
T , R ,
-15.0 -31
-9.5 -31
-19.5 -31
-20 -31
-23.5 -31
-15 -31
-20 -31
-23.5 -31
-14 -31
34
(M.m) is 2.8 dB/km,
Worst* typical
distance OPB,
dB Km, fdx dB
14 5 17
19.5 5.9 23.5
9.5 3.4 13.5
9.0 2.5 14
5.5 2.0 12
14 28 17.5
9.0 3.0 15.8
5.5 2.0 12.2
15 5 16
t 100Mbps speed
f
typical*
distance
Km, fdx
6
7
4.8
5
4
35
5.5
4.0
5.7
only