Power Budget Calculations With Fiber Media - GE MULTILINK ML2400 Instruction Manual

CHAPTER 4: OPERATION
4.1.8

Power Budget Calculations with Fiber Media

Module Speed
A1, A5 10 Mb FL
A2, A3, A6 100 Mb FX
A7, A8 100 Mb FX
AA, AB 100 Mb FX
AC, AD, AE 100 Mb FX
AF 10 Mb FL
AG 100 Mb FX
G7 1000 Mb
G8 1000 Mb FX
G9, GM 1000 Mb FX
GA 1000 Mb FX
GB 1000 Mb FX
MULTILINK ML2400 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL
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
MultiLink products, the following equations should be used:
where: OPB = optical power budget
P = transmitter output power
T
P = Receiver Sensitivity
R
The worst case OPB is as follows:
OPB
worst
The worst-case distance is calculated as follows:
distance
The cable loss in dB/km is defined in the following table:
Cable size
62.5 / 125 μm
50 / 125 μm
100 / 140 μm
9 / 125 μm
The following data has been collected to provide guidance to network designers and
installers.
Table 4–2: Power budget values for various modules
Mode fdx (hdx) λ
multi 2 (2) km 850 nm 62.5/125 μm
multi 2 (0.4) km 1300 nm 62.5/125 μm
single 18+ (0.4) km 1300 nm
multi 2 (0.4) km 1310 nm 62.5/125 μm
single 15+ km 1310 nm
850 nm 62.5/125 μm
multi 2 (2) km
single 18+ (0.4) km 1310 nm
1310 nm 62.5/125 μm
multi 0.55 km
single 10 km 1310 nm
single 25 km 1310 nm
single 40 km 1310 nm
single 70 km 1310 nm
OPB P P
= –
t min ( ) R min (
OPB 1dB (LED aging)
= – –
worst-case OPB (in dB)
------------------------------------------------------- -
=
worst
cable loss (in dB/km)
Table 4–1: Cable losses
Mode
multi-mode
multi-mode
multi-mode
single-mode
Size P P
T
-15.0 dB -31 dB
100/140 μm -9.5 dB -31 dB
50/125 μm
-19.5 dB -31 dB
-20 dB- -31 dB
50/125 μm
23.5 dB -31 dB
9/125 μm -15 dB -31 dB
-19 dB -31 dB
9/125 μm -15 dB -28 dB
-15.0 dB -31 dB
100/140 μm -9.5 dB -31 dB
50/125 μm -19.5 dB -31 dB
9/125 μm -20 dB -31 dB
-9.5 dB -17 dB
50/125 μm
9/125 μm
-9.5 dB -20 dB
9/125 μm -4.0 dB -21 dB
9/125 μm -4.0 dB -21 dB
9/125 μm -3.0 dB -23 dB
OPERATION
)
1dB (insertion loss)
Cable loss
2.8 dB/km
2.8 dB/km
3.3 dB/km
0.5 dB/km
0.4 dB/km (LXSC25)
0.25 dB/km (LXSC40)
0.2 dB/km (LXSC70)
OPB d OPB
R worst worst
14 dB 5.0 km 17 dB
19.5 dB 5.9 km 23.5 dB
19.5 dB 3.4 km 13.2 dB
9.0 dB 3.0 km 14 dB
5.5 dB 2.0 km 12 dB
14 dB 28 km 17.5 dB
12 dB 4.0 km 16 dB
11 dB 22 km
14 dB 5.0 km 17 dB
19.5 dB 5.9 km 23.5 dB
9.5 dB 3.4 km 13.5 dB
9.0 dB 18 km 12.5 dB
5.5 dB 2 km 12.5 dB
8.5 dB 17 km 10.5 dB
15 dB 38 km 17.5 dB
15 dB 60 km 17.5 dB
18 dB 90 km 20.5 dB
(EQ 4.1)
(EQ 4.2)
(EQ 4.3)
d
typ typical
6.0 km
7.0 km
4.8 km
5.0 km
4.0 km
35 km
5.7 km
-- --
6.0 km
7.0 km
4.8 km
25 km
4 km
21 km
43 km
70 km
102 km
4–5