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Magnum 6K25 Managed Fiber Switch Installation and User Guide (04/06)
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4.6 Power Budget Calculations for Magnum 6K25 PM’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
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
m (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
and the “Cable Loss” for 9/125 (Single-mode) is 0.4 dB/km (LXSC25)
and the “Cable Loss” for 9/125 (Single-mode) is 0.25 dB/km
(LXSC40)
and the “Cable Loss” for 9/125 (Single-mode) is 0.2 dB/km (LXSC70)
The following data has been collected from component manufacturer’s (Agilent’s and
Lucent’) web sites and catalogs to provide guidance to network designers and installers.
Fiber
Port
Module
Speed,
Std.
Mode
Std.
km
fdx
(hdx)
Wave
-
length
nm
Cable
Size
m
X’mitr
Output
P
T ,
dB
R’cvr
Sens.
P
R ,
dB
Worst
OPB,
dB
Worst*
distance
Km, fdx
typical
OPB,
dB
typical*
distance
Km, fdx
6KP4-
F10ST
10Mb
FL
Multi-
Mode
2
(2)
850
62.5/125
100/140
50/125
-15.0
-9.5
-19.5
-31
-31
-31
14
19.5
19.5
5
5.9
3.4
17
23.5
13.5
6
7
4.8
6KPM-
MST, MSC
100Mb
FX
Multi-
mode
2
(0.4)
1300
62.5/125
50/125
-20
-23.5
-31
-31
9.0
5.5
3.0
2.0
14
12
5
4
6KPM-SSC
100Mb
FX
Single-
mode
18+
(0.4)
1300 9/125 -15 -31 14
28
17.5
35
6KPM-
SSCL
100Mb
FX
Single-
mode
40
(0.4)
1300 9/125 -5 -34 29
58
32.5
65
6KPM-
MTRJ
100Mb
FX
Multi-
mode
2
(0.4)
1300
62.5/125
50/125
-20
-23.5
-31
-31
9.0
5.5
3.0
2.0
15.8
12.2
5.5
4.0
6KPM-
MLC
100Mb
FX
Multi-
mode
2
(0.4)
1300 62.5/125 -19 -31 12
4
16
5.7
6KPM-SLC
100Mb
FX
Single-
Mode
15+
(0.4)
1310 9/125 -15 -28 11
22
-
-
GBIC-
SXSC
1000Mb Multi-
mode
0.55
1300 62.5/125
50/125
-9.5 -17 5.5
2
12.5
4
GBIC-
LXSC10
1000Mb Single-
mode
10
1300 9/125 -9.5 -20 8.5
17
10.5
21