Siemens SIMATIC NET PROFIBUS Owner's Manual page 86

Configuring Networks
Power Budget for OLM G11-1300, G12-1300 for One Point-to-Point
Link at Wavelength
Attenuation on the cable
Fiber type Attenuation
a
FOC
62.5/125 m 1.0 dB/km
Attenuation for connectors
a Number
Conn
1 dB 0
Attenuation caused by splices
a Number
Spl
0.2 dB 5
Attenuation of the transmission path
Data of the OLM/G11-1300, G12-1300 power that
can be coupled into 62.5/125 m fibers
P
out, min
–17 dBm
Receiver sensitivity
Prec
, min
–29 dBm
Maximum permitted attenuation
Link power margin
The transmission path can be implemented as planned.
Note
The maximum length of fiber-optic cable that can be supplied in one piece depends on the
cable type but is approximately 3 km per drum. Longer links must therefore be put together
using more than one piece of cable. To connect the sections of cable, coupling elements or
splices must be used reducing the maximum possible cable length due to their attenuation.
3-20
= 1310 nm
Cable length
L
9 km L* a
Number *
a
Conn
Number * a
a
Path
a
max
a
max
=
FOC
+
+
+
Spl
=
= P – P =
out, min rec, min
– a =
Path
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
9.0 dB
0 dB
1.0 dB
10.0 dB
12 dB
2 dB