Configuring Networks
3-19
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Power budget for OLM/G11, G12 for a point-to-point link with the wavelength
λ = 860 nm
Attenuation on the cable
Fiber type
Attenuation
a
FOC
Cable length L
62.5/125 µm 3.5 dB/km 2.85 km L* a
FOC
= 10.0 dB
+
Attenuation for connectors
a
Conn
Number
+
0.4 dB 1 Number *
a
Conn
0.4 dB
Attenuation caused by splices +
a
Spl
Number
0.2 dB 3 Number * a
Spl
0.6 dB
Attenuation of the transmission path a
Path
= 11.0 dB
Characteristic data of the OLM/G11, G12
maximum power coupled into 62.5/125 µm fiber
P
out,
min
–13 dBm
Receiver sensitivity
Prec
,
min
–28 dBm
Maximum permitted attenuation a
max
= P
out,
min
– P
rec,
min
= 15.0 dB
Link power margin a
max
– a
Path
= 4.0 dB
The transmission path can be implemented as planned.
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