I looked at your link and it actually doesn't answer the question about when the dead period actually starts. This link gives dates and here is a quick guide:
http://fs.ncaa.org/Docs/AMA/recruiting_calendars/2011/I/Football.pdf
August 1, 2011 through November 26, 2011 — Quiet Period.
November 27, 2011, through January 28, 2012 — Contact Period (except for the following periods listed below).
December 18 through January 8th — special considerations for JuCo prospects (see official NCAA Calendar). December 18 — Quiet Period.
December 19 — January 3 — Dead Period (see exceptions listed on NCAA PDF).
January 8 — Quiet Period.
January 9 — January 12 — Dead Period (see exceptions listed on NCAA PDF).
January 29 — Quiet Period.
January 30 — through February 2 — Dead Period.
February 1, 2012 -- National Signing Day runs through April 1, 2012.
February 3 through April 14 — Quiet Period.