Triple-Play Service Deployment

Appendix A: PON Reflectometer Trace Analysis
For the PON network, the OTDR trace shows the splitter, splices,
and connectors along the link. Prior to the splitter, the analysis is
simple and is similar to the analysis of the core network. But
following the splitter, the analysis becomes more complex. With
only the trace and the table of events given directly by the OTDR,
it is impossible to locate and measure the different events of the
different branches that are located after the splitter. The OTDR
trace does not take into account the fact that there are different
branches. It only analyzes the light that reflects from the entire
network (see Figure A.2). All the information is available on the
trace itself. But, it is necessary to decode the information coming
from the OTDR. Further software analysis is required for this
decoding procedure.
Figure A.2 OTDR trace of a point-to-multi-point network
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