Operation Manual

Using the OTDR Module

Looking at OTDR Test Results

7-43

Table 7-4.

The attenuation per kilometer for the fiber segment before the event. This value may not be shown if it

could not be measured accurately. This can occur on short segments or if the connector before the

segment has a large deadzone.

The power of the light reflected back to the OTDR from an event. A smaller (more negative) reflectance

value means less light is reflected back. For example, a good connection may have a reflectance of -45 dB.

A dirty connection that reflects more light back to the OTDR may have a reflectance of -20 dB.

Reflectances that exceed the tester's measurement range are shown as the largest measurable value and

are preceded by a “>” (greater than) symbol.

Reflectance measurements are affected by the

backscatter value entered in Setup.

OTDR Measurement Details (cont.)

-continued-

Detail Description

Segment

Attenuation

Coefficient

Reflectance