Glossary 81Glossary9 GlossaryAAPCO The Association of Public SafetyCommunications Officials.The APCO Project 25 standards committee(http://www.apcointl.org/) defined a digitalradio standard. The standard is often referredto as ‘APCO’ or ‘P25’.Cchannel A channel is a pair of frequencies used totransmit and receive radio signals.FFCC Federal Communications Commission, anindependent United States governmentagency that regulates interstate andinternational radio communications.LLED Light Emitting Diode, a device that is able toemit light.Mmute A mute controls the circumstances underwhich a received signal is passed to the radio’sspeaker. For example, when a signal isreceived by the radio, the mute may remain‘closed’ if the signal is not strong enough,does not have valid signaling or is encrypted.
