Siemens SIMATIC NET PROFIBUS Owner's Manual page 250

Siemens network system owner manual
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Testing PROFIBUS
How an OTDR Functions
An OTDR can be compared to a radar unit The OTDR sends laser light pulses on
the FO cable to be tested (the end of the cable is open). These light pulses are
reflected more or less strongly by all problem points along the cable. A meter
evaluates the intensity and propagation time of the reflected pulses.
Transmitter
(Laser light)
Analysis
and
display
Figure A-4
A-10
Measuring
receiver
How an OTDR Functions
Test FO
cable
1. Send light pulses
2. Evaluate reflections for
– intensity
– propagation time
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000

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