A deuterated dipole glass $Rb_{1-x}(ND_4)_xD_2PO_4$ (DRADP-x, x=0.47) has been studied by low frequency dielectric measurements to understand the slow relaxation dynamics of glass freezing as temperature was lowered. A distribution of relaxation times was observed to become broad and the peak of the spectrum to move to the low frequency side. With a careful observation of the dielectric loss part a crossover behavior was apparent from the relaxation time distribution with a low frequency tail (which corresponds to Kohlrausch-Williams-Watts stretched exponential) to the distribution with a high frequency tail (which corresponds to Curie-von Schweidler power law). Chamberlin et al. proposed dynamically correlated domains (DCDs) model to explain the two universal relaxation functions of the glassy freezing. This model was applied to our DRADP dipole glass to explain the apparent crossover behavior. In the crossover region between 40K and 42K the spectrum showed a very broad symmetric shape where one single DCDs model failed to fit. Instead two (both C>0 and C<0) relaxation functions of the DCDs model fit best the experimental data in this crossover region. When adopting this DCDs model it was presumed that dipole glass was in a quenched random disorder state where the domain size distribution function was a Poisson derived from percolation theory. Above 50K instead of using a Poisson function as the domain size distribution of DCDs model a Gaussian function was used to show better fitting results. This indicated that dipole glass at this temperature region was in annealed random disorder state rather than quenched state. An aging effect experiment was devised to find the reason why Gaussian size distribution function was better than Poisson function above 50K whereas Poisson distribution function became better below 50K. Experiments did not show an aging effect above 50K but displayed an evidence of aging effect below 50K. If there is no aging effect, dipole glass exists in the annealed state with a Gaussian size distribution but if there is apparent aging effect, dipole glass exists in the quenched state with a Poisson size distribution. Glass freezing is characterized by this transition from the annealed state to the quenched state.
