6BACKGROUND OPERATIONStime-out timer (tot)The Time-out Timer prevents you from using a channel for an extended duration.If you continuously transmit for a preset time, the transceiver will stop transmittingand an alert tone will sound. Release the PTT switch to stop the tone.AuxiliAry portPress the key programmed as AUX to activate the auxiliary port. The auxiliaryport is used with optional boards.• The icon appears on the display when the auxiliary port is active.buSy chAnnel lockout (bcl)If BCL is set up by your dealer, you will be unable to transmit if the channel isalready in use.• “BUSY” appears on the display when you press the PTT switch. Use a different channelor wait until the channel becomes free.If your dealer has programmed BCL Override for your transceiver, you canoverride the BCL by pressing the PTT switch again, immediately after releasing it,when the channel is busy.ptt idPTT ID is the transceiver unique ID code which is sent each time the PTT switchis pressed and/or released.compAnderIf programmed by your dealer for a channel, the compander will removeexcessive noise from transmitted signals, providing higher clarity of signals.trAnSmit powerYour dealer has programmed a transmit power level for each channel. Powerlevels can be high or low.