Fluke Networks CertiFiber Pro Users Manual - Manual (Page 281)

Chapter 9: How to Use the OptiFiber Pro OTDR Module
OTDR Results
259
 SEGMENT ATTENUATION: This tab shows the attenuation
coefficient of the fiber segment before the event. This is the
attenuation per unit of length for the segment. This value
shows as N/A if the tester could not measure it accurately.
This can occur for short segments or if the connector before
the segment has too much tailing.
About Measurements that Show “<“ and “>”
In some situations, measurements show with a "<" or ">" (less
than or greater than) symbol. This occurs if the fiber is too long,
the signal is weak, events are very close together, or a
measurement is beyond the range of the tester.