Operation Manual

DTX Series CableAnalyzer

Technical Reference Handbook

7-46

Table 7-4.

•

One or more loss value is significantly negative (-0.2 dB or more).

•

There is a bad connection on the fiber.

•

There is a connection between fibers with different backscatter coefficients. For example, there is a

connection between fibers with different core sizes.

If you test the fiber from the other end, the gaine

r event will show a loss. Adding this loss to the

event’s gain gives the true loss of the event. If you do a bi-directional test, then upload the results to

LinkWare software, you can use the bi-directional averaging utility in LinkWare to calculate the true

loss of gainers.

Gainers at launch events can occur when the

launch fiber does not have the same properties as the

fiber you are testing. In this situation, you can get more reliable results if you do a bi-directional test

and calculate the true loss as described above. Use a receive fiber that has the same properties as the

launch fiber and use Launch + Receive compensation.

OTDR Measurement Details (cont.)

Detail Description

arnings Negative loss value (a gainer) found in test result: