Good data in Tektronix TDR Datasheet

Explains well how a TDR works

http://www.tek.com/fact-sheet/tdr-impedance-measurements-foundation-signal-integrity

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Useful Links : 1

Everything starts with installing octave
Use this if you have a windows system
http://www.octave.org/wiki/index.php?title=Octave_for_Windows

Some other links related
http://octave.sourceforge.net/communications/function/eyediagram.html
http://rf.helpingcreate.com/cgi-bin/octave.pl?page_name=examples
http://octave.sourceforge.net/packages.php

Manual installation instructions for the Octave-forge packages

1. Extract the complete directories tree from Octave3.6.1_gcc4.6.2_pkgs_20120303.7z to the installation directory (<your_install_dir>) keeping the original directory structure as in the archive (you can use 7zip tool from http://www.7-zip.org/).
2. In order to update octave_packages database with your installation tree and auto-load most packages (excluding 'ad' and 'windows' which may crash octave when loaded and 'clear all' is executed), launch Octave and execute the following 3 rebuild commands from the octave console:

   pkg rebuild -auto
   pkg rebuild -noauto ad windows
   pkg rebuild -noauto nan % shadows many statistics functions
   pkg rebuild -noauto gsl % shadows some core functions
   pkg rebuild -auto java

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