Before revision: In May 2010, ITU-T selected candidate models from three companies (OPTICOM, SwissQual / Rohde & Schwarz company, and TNO (Netherlands Organisation for Applied Scientific Research)).
After revision: In May 2010, ITU-T selected candidate models from three companies (OPTICOM, SwissQual / Rohde & Schwarz and TNO (Netherlands Organisation for Applied Scientific Research)).