* White Rabbit Calibration: <http://www.ohwr.org/documents/213>
*[spec-2-spec]: SPEC-2-SPEC demo
*[wr_external_reference.pdf]: How to use the grandmaster mode in the switch.
*[spec-getting-started.pdf]:A tutorial to get ready to work with the (SPEC), including hardware deployment instructions, full required toolchain setup and a collection of step-by-step demonstrative tutorials.