What is tone control?
A. Tone control (also referred to as Tone Remote Control (TRC)) refers to the use of inband tone sequences to control a radio that is connected to an LMR gateway (typically a base station). In Cisco IPICS, you can use tone control to perform various functions, such as modifying or tuning a channel to a different radio frequency (RF), changing the transmit power level, and enabling or disabling radio built-in encryption. TRC uses well-defined audio sounds (also referred to as tones) to change the behavior of a device. A tone-keyed radio system requires that a specific tone be present on the incoming analog (e-lead) port. If this tone is not present, the radio does not transmit audio. See the “Managing Radios” section for more information.
