Project description

With my simple yet helpful utility application you could convert many TRC files to the SOR files. SOR files will be in Telcordia Bellcore standard file format supporting by all OTDR manufacturers (VIAVI, JDSU, AFL, etc.). Trc2sor is a Freeware software in the category System Utilities developed by trc2sor. Download trc2sor free. Trc2sor is simple OTDR trace trc to sor converter.

The SOR ('Standard OTDR Record') data format is used to store OTDR(optical time-domainreflectometer) fiber data. The format is defined by the Telcordia SR-4731, issue2standard. While it is a standard, it is unfortunately not open, inthat the specifics of the data format are not openly available. Youcan buy the standards document from Telcordia for $750 US (as of thiswriting), but this was beyond my budget. (And likely comes withall sorts of licensing restrictions. I wouldn't know; I have neverseen the document!)

There are several freely available OTDR trace readers available fordownload on the web, but most do not allow exporting the trace curveinto, say, a CSV file for further analysis, and only one that I'vefound that runs natively on Linux (but without source code; althoughsome of these do work in the Wine emulator). There have been requestson various Internet forums asking for information on how to extractthe trace data, but I am not aware of anyone providing any answersbeyond pointing to the free readers and the Telcordia standard.

Fortunately the data format is not particularly hard to decipher. Thetable of contents on the Telcordia SR-4731, issue2page provides several clues, as does the Wikipedia page on opticaltime-domainreflectometer.

Using a binary-file editor/viewer and comparing the outputs fromsome free OTDR SOR file readers, I was able to piece together most ofthe encoding in the SOR data format and written a simple program (inPython) that parses the SOR file and dumps the trace data into a file.(For a more detailed description, other than reading the source code,see my blogpost).

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Presented here for your entertainment are my findings, in the hopethat it will be useful to other people. But be aware that theinformation provided here is based on guess work from looking at alimited number of sample files. I can not guarantee that there are nomistakes, or that I have uncovered all possible exceptions to therules that I have deduced from the sample files. use it at your ownrisk! You have been warned!

The program was ported over from my original pubOTDRwritten in Perl. To parse an OTDR SOR file, run the program as

where 'mfile.sor' is the name (path) to your SOR file. A OTDR trace file 'myfile-trace.dat' and a JSON file 'myfile-dump.json' will be produced. Turbotax 2018 for mac. You can also output the results as an XML file 'myfile-dump.xml' with:

There is also a Ruby version (rbOTDR), ajavascript/node version(jsOTDR), and aClojure version (cljotdr); the Clojureversion may be of interest to people looking for a Java version, since Clojure runs on top of a Java Virtual Machine (JVM).

Install

Dev Install

This program requires python 2 or python 3. To install dependencies, run

I recently reorganized the whole package to submit to PyPI (Python Package Index). You shouldnow be able to install the whole thing with

This should create an executable called pyOTDR that is ready to use.

Docker

There is a docker image that you can download with the command

If you would like to build the docker image yourself, a docker file (Dockerfile) is provided to help you test this program. In the top level directory, type the command

or type the command

to build the docker image. It will take a while to download the base image and compile. Ifall goes well, it should successfully build a new docker image sidneyli/pyotdr:latest.You can check with the command:

once the build is completed. You can now run the command

or type the docker command:

to spin up an instance of the docker image. This will start a command shell for you to run the pyOTDR.py program. The docker commandabove will mount your home directory to the /data folder inside the docker instance. Thecommand pyOTDR.py (installed as /pyOTDR/pyOTDR.py) will be in your execution path.The docker instance removes itself when you exit the instance.

(Last Revised 2020-05-09)

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