Siemens SIMATIC NET PROFIBUS manual Optical Time Domain Reflectometer Otdr

Testing PROFIBUS

A.2.3 Optical Time Domain Reflectometer (OTDR)

If the attenuation measurement described above indicates that the total attenuation of the fiber-optic link is too high, the causes and the location of the problem must be established. In this case OTDR units are used (OTDR = Optical Time Domain Reflectometer).

Figure A-3 Optical Time Domain Reflectometer (OTDR)

OTDRs exist for the wavelengths 850 nm and 1300 nm. This means that this method can be used for both multimode and single-mode fiber-optic cables.

PROFIBUS Networks SIMATIC NET	A-9
6GK1970-5CA20-0AA1 Release 2 05/2000