OTDR Series e-Manual, D07-00-076P-RevC00 Page 66 of 107
7.0 Working with the OTDR
7.1 Test Setup
Note: Screens provided in this section are based on the V300 series OTDR. Slight differences
may occur between FX150, FX300, MTTplus, or RxT platform screens when describing OTDR
and OPM operation.
7.1.1 Initial Settings
Wavelength: Select the wavelengths, which you wish to use to test the fiber.
• OTDR - If the OTDR contains both single and multi-mode optical fiber test ports,
selecting a single-mode OTDR wavelength (SM1310, SM1550, SM1625) automatically
prevent the selection of multimode OTDR wavelengths (MM 850, MM1300) and vice
versa.
• OTDR Aux - The Aux port is reserved for:
• In-service filtered testing at 1625nm or 1650nm.
• Multimode testing when OTDR is equipped with both singlemode and multimode
capability
For RxT-4111 only
• DWDM Grid - Select the channel that you wish to test
• Frequency – The displayed frequency automatically matches the chosen test
wavelength/Channel
• Wavelength - Select the test channel/wavelength
Fiber/Connector Check: (Can only be deactivated in Manual mode)
• Fiber Check - Confirms if a live fiber carrying customer traffic is connected to the OTDR
if a live fiber is detected, a warning is displayed, and the OTDR laser will not transmit
thus preventing any service disruption.
• Connector Check - When selected, the unit will check the loss and reflectance of the
OTDR connection to the Fiber-Under-Test or launch fiber. If excessive loss or poor
reflectance is detected, the OTDR displays a “Bad connection detected” message. If a
patchcord is too short, the user may also get this message. The User has the option to
stop the test and check the fiber or resume the measurement.
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