Glossary 899 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 In a conventional system, a channel is a pair offrequencies used to transmit and receive radiosignals.In a P25 trunking system, a channel is a groupof radio users.controlchannelIn a P25 trunking system, the control channelis used by the trunking site to let the radiounits in the site’s coverage area know whenthey can transmit their call information.conventionaloperationIn conventional operation, the radio is tunedto a programmed channel, andcommunicates with other radios either onthat channel, or through a repeater system.Ffailsoft Failsoft operation offers P25 conventionaloperation if the radio cannot acquire a controlchannel on a trunking system for an extendedperiod of time. The conventional channel maybe a repeater channel or a direct channel.FCC Federal Communications Commission, anindependent United States governmentagency that regulates interstate andinternational radio communications.
