MTP-200 Series User’s Manual
Shineway Technologies, Inc. - 40 -
9.14 Load Default
In OTDR Setup surface, there are 3 “default” button, corresponding to IOR, scatter
coefficient (back scatter), non-reflection threshold (splice loss detecting threshold),
reflection threshold (reflection detecting threshold) and end threshold (optical fiber end
detecting threshold).
10 Use OTDR Test FTTx-PON Network Optical
Fiber Link
For FTTx-PON network optical fiber link, it’s different from normal optical fiber link; and
there is branching unit in link. So, it needs to know and notes follow items when use this
instrument to test FTTx-PON network.
10.1 Use PON Optimized OTDR Instrument
Some models optimized specific to FTTx-PON network optical fiber link, can get fairly
ideal result.
In order to get ideal result, it needs to correctly set distance range, end threshold (optical
fiber end detecting threshold), reflection threshold (reflection detecting threshold) and etc.
10.2 Select the Proper Distance Range
As there is branching unit in FTTx-PON network optical fiber link, there will be a big
attenuation event of tens dB, auto test may get a wrong distance. Suggest manually select
the parameters like proper distance range, pulse width and etc according to the prescient
optical fiber link length.
10.3 End Threshold (Optical Fiber End Detecting
Threshold)
As there is branching unit in FTTx-PON network optical fiber link, there will be a big
attenuation event of tens dB, if the end threshold configuration is not proper, end event may
be analyzed inaccurate.
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