The Digital Emission Spectrum Model report was released in September 1993. A computer program was developed to calculate the power spectral density (PSD) and the fractional power containment bandwidth for various digital modulation techniques. The power containment capability was used to provide guidance for determination of necessary bandwidth in support of Annex J of the NTIA Manual. This report documents the models contained in the computer program and illustrates the models with various sample problems. The report also shows the verification of the computer program implementation.