OTDR Series e-Manual, D07-00-076P-RevC00 Page 89 of 107
7.5.6 ORL Measurement
ORL is the total amount of light being reflected back towards the transmitter or source. This
includes all backscatter and all reflections. The OTDR can calculate ORL from the fiber trace
using the following procedure:
1. Make sure the Trace is active.
2. Select ORL from drop-down list.
3. Place the marker A at the beginning of the fiber and marker B at the end of the fiber span
under measurement.
The Result box at the bottom of the screen displays:
• Distance to A cursor
• Distance to B cursor
• Distance between markers A-B
• Loss between the markers A-B (dB)
• Optical Return loss (ORL), dB
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