MTP-200 Series User’s Manual
Shineway Technologies, Inc. - 17 -
3.8 Load Default
This function is used to set system settings to factory default. Those parameters include:
Interface style, language, power saving and OTDR features.
Load default:
1. In main interface, click [Setup].
2. In setting menu, click [Load Default], system promotes a warning message: “Restore
factory settings?”
3. Click “Yes” to continue, click “No” to cancel.
Unless it’s necessary, please do not load default because it will erase your existing settings.
4 Basic Information of OTDR Module
4.1 Principle of OTDR Module
OTDR (Optical Time Domain Reflectmeter) is a measurement instrument for identifying
optic fiber transmission features. It is mainly used to measure attenuation of a whole optic
fiber chain and provide attenuation details relating to length, namely detect, locate and
measure any event in optic fiber chain (Events refer to faults caused by splicing, connectors
and bending). Its non-destructive, one-end connection and rapid measurement features have
made the OTDR module an indispensable tool for the testing application of optic fiber
manufacture, construction and maintenance.
The faults and heterogeneity of optic fiber itself cause Rayleigh scattering of light pulse
transmitted in optic fiber. Part of light pulse is scattered in the reverse direction, and this is
called Rayleigh backward scattering, which actually provides attenuation details relating to
length.
Information relating to distance is obtained through time information (That’s the reason why
there is “Time Domain” in the name of OTDR). Fresnel reflection occurs at the boundary
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