TTI FTE-7000A User Manual page 30

Chapter 7 OTDR Operation
7.11 Event Analysis
NOTE:
When using the event table and the Fib-R-Map, it is necessary to keep in mind that event analysis
provides approximate loss and distance measurements to quickly assist in network evaluation.
Automatic detection results are not guaranteed and have their limits, possibly causing
erroneous readings or detection failure. User interaction by interfacing with the trace display is
recommended for fi nal qualitative and quantitative analysis.
Enter Event Analysis
To enter event analysis, press the menu button and use the left / right buttons to highlight the event analysis
icon and press select.
NOTE:
All the entries on the parameter screen are operational with the touch screen. To exit the parameter
screen with touch screen function, touch the Return button.
Threshold Settings
There are four threshold settings, EOF, Loss, ORL and Link. (See Fig 7.4) The EOF is not a Pass/Fail
threshold, it is used to set a loss value to determine the end of fi ber. IF the EOF threshold is set for 3dB, then
the fi rst event that has a loss of 3dB or greater will be deemed the EOF.
To change the threshold settings, press the Menu button, use the left/right buttons to highlight the settings
icon and press select. The cursor is the yellow highlighted area. (If the yellow cursor is on a value that is the
current selection, that block will be highlighted green.) The setting highlighted in blue is the current setting.
Use the LRUD buttons to highlight the desired threshold category and press the select button. Use the up/
down buttons to set the digit, and use the left/right buttons to move to the next or previous digit. Once the
desired setting is entered, press the select button. Use the LRUD buttons to move to the next setting until all
thresholds have been set as desired. To exit the parameter screen, press the menu button.
Splice, ORL and Link are all thresholds for Pass/Fail purposes.
NOTE:
Thresholds are "pass thresholds", a value entered as a threshold is a passing value.
Examples of these settings are as follows:
Splice: If a 1.00dB splice loss is acceptable, set the threshold to 1.00. If a splice loss of 1.00 is the fail
point, set the threshold to 0.99
ORL: If a -50dB refl ectance is acceptable, set the threshold to 50. If -50dB is the fail point, set the
threshold to 50.5.
Link: If a 20dB, link loss is acceptable, set the threshold to 20. If 20db link loss is the fail point, set
the threshold to 19.5.
FTE-7000A User's Guide Rev A 5/2014 25