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The DECT frequencies and DECT frequency bands are normally allocated to DECT technology. The most common DECT frequencies are from 1880 - 1900 MHz. This DECT frequency allocation is the most widespread and used in Europe. This DECT spectrum is unlicensed and technology exclusive, and this ensure ensures almost interference free operation.
The STC number is derived from sound attenuation values tested at sixteen standard frequencies from 125 Hz to 4000 Hz. These Transmission Loss values are then plotted on a sound pressure level graph and the resulting curve is compared to a standard reference contour.ating methodology [edit]. The ASTM test methods have changed every few years. Thus, STC results posted before 1999 may not produce the same results today, and the differences become wider as one goes further back in timeâthe differences in the applicable test methods between the 1970s and today being quite significant.