Siemens SIMATIC NET PROFIBUS manual 10.0 dB, 12 dB

= 1310 nm

Configuring Networks

Power Budget for OLM G11-1300, G12-1300 for One Point-to-Point Link at Wavelength λ

Attenuation on the cable

Fiber type	Attenuation	Cable length
	aFOC	L
62.5/125 ∝ m	1.0 dB/km	9 km
Attenuation for connectors
aConn	Number
1 dB	0
Attenuation caused by splices
aSpl	Number
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

Pout, min

–17 dBm

Receiver sensitivity

Prec, min

–29 dBm

Maximum permitted attenuation

Link power margin

L* aFOC =		9.0 dB
	+
	+
Number *		0 dB
aConn
	+
Number * aSpl		1.0 dB
aPath =		10.0 dB

amax = Pout, min – Prec, min =	12 dB
amax – aPath =	2 dB

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	PROFIBUS Networks SIMATIC NET
	6GK1970-5CA20-0AA1 Release 2 05/2000