A.c. conductivity measurements and its analysis are performed on the xNa(2)O + (1 - x)B2O3 ionic conducting glass system, where 0.05 < x < 0.45. The a.c. conductivity data are analysed using both Jonscher's power law and diffusion controlled relaxation (DCR) model. The DCR model is used to interpret the observed dispersion in a.c. conductivity in terms of diffusion controlled dielectric loss relaxation mechanism. All the known experimental features of the sigma'(omega) including scaling behavior are explained satisfactorily. The results show an excellent agreement with scaling behavior based on loss peak frequency. (C) 2003 Kluwer Academic Publishers.