A radioterminal may include a transceiver, a hands-free interface, and a satellitehands-free interlock. A metric describing the overall system performance may be derived during network operation or simulation and compared to an ideal metric describing the same distributed system performance. The system includes an encoder for providing the numerical digit with the date stamp, a storage for storing the encoded numerical digit, and a decoder for decoding the numerical digit to indicate at least the date of origin of the numerical digit. The ratio D1D2 is compared to a threshold to classify the DTX state of the received burst. More particularly, the embodiments pertain to an image forming medium comprising photochromic materials comprising unsymmetrical dithienylethene photochromes which provide longer image lifetimes and \u201cerase-on-demand\u201d capability.