GarrettCom Quad Manual De Usuario
Magnum Quad-Series Fiber Switches
Installation and User Guide (06/03)
= OPB - 1dB(for LED aging) - 1dB(for insertion loss)
Wors
Siemens’) web sites and catalogs to provide guidance to network designers and installers.
Fiber
Port
odule
Speed,
Std.
Mode
Std.
km
fdx
fdx
(hdx)
Wave
-
length
nm
Cable
Size
µm
X’mitr
Output
P
T ,
dB
R’cvr
Sens.
P
R ,
dB
Worst
OPB,
dB
Worst*
distance
Km, fdx
Km, fdx
typical
OPB,
dB
typical*
distance
Km, fdx
Km, fdx
4.7
Power Budget Calculations for Quad-Series QPM’s with Fiber
Media
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
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
t 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
The following data has been collected from component manufacturer’s (Agilent’s and
M
QPM
10 Mb Multi-
2
850
62.5/125
100/140
-15.0
-9.5
-31
-31
-31
14
19.5
5
5.9
17
23.5
10-
FST
ode
(2)
50/125
-19.5
-31
9.5
3.4
13.5
6
7
7
4.8
FL
m
QPM-
ST, MSC
100Mb
FX
Multi-
mode
2
(0.4)
1300
62.5/125
50/125
-20
-23.5
-31
-31
9.0
5.5
2.5
2.0
14
12
5
M
4
Q
-31 14 28
17.5 35
PM-SSC
FX
mode
(0.4) 1300
9/125 -15
100Mb Single-
18+
QPM-
100Mb Multi-
2
1300
62.5/125
-20
-31
9.0
3.0
15.8
MTRJ
FX
mode
(0.4)
50/125
-23.5
-31
5.5
2.0
12.2
5.5
4.0
QPM-
100Mb Multi-
2
(0.4) 1300 62.5/125
-14 -31 15 5
M
FX
mode
V45
16 5.7
*
The use of either multi-mode or single-mode fiber to operate a
Note:
t 100Mbps speed
over long distances (i.e., in excess of approx. 400 meters) can be achieved
only
full-duplex (factory default) setting for 100Mbps fiber ports must be used,
•
ca
P
h
f
ssive Atte
(Attenuation = C
s
if the following factors are both applied:
•
The 100Mb fiber segment must operate in full-duplex (FDX) mode, i.e. the
and
The
pa
The
pa
worst-
se O B of t
n.
e fiber link must be greater than the iber cable’s
n
o
able lo
uati
s L
+ ED aging loss + Insertion loss + safety factor)
34
www GarrettCom com
.
.