Orion LBI-38888K - Manual (Page 74)

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First Come First Serve Display
In this mode the control unit display will show the call information of the
radio that is providing the audio. A call in process prevents audio from
other radios from being heard for the duration of the call. This mode
corresponds with the first come first serve audio mode (see following
paragraph on Audio Modes).
Audio Modes
In multiple radio operation, the audio from the mobile radio units can be
pre-programmed to be summed or available on a first come first serve
process.
Audio Summed
When audio is summed, the audio from all radios will be available when-
ever the radios receive a call. If two radios receive a call simultaneously
both calls will be heard in the speaker.
Audio First Come First Serve
When audio is pre-programmed for first come first serve, the audio from the
radio that receives a call first will be heard from the speaker for the duration
of the call. During this time audio from the other mobile radios will be
muted.
Muting A Specified Radio
Pressing the control unit mute button associated with a particular radio will
mute its audio for a pre-programmed time period. The time period can be
cleared by pressing the control unit mute button or the radio selection
button.
Multiple Radio And Siren & Light Operation
For siren & lights to function correctly, both the master and slave radios
must be programmed with the same siren & light information.
Multiple Radio And Data Operation
Only the master radio supports mobile data operation.