E F Johnson Company 2425M70 Benutzerhandbuch

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When an emergency alarm or call is placed, this ANI signaling is replaced by the 
Emergency DTMF ID (see Section 6.9). Refer to Section 6.12.3 for information on 
MDC1200 ANI.

The radio will transmit and send a single tone as programmed in Armada. Single tone ANI 
provides call-in signaling, but does not provide identification of individual units, i.e. all 
units use the same single tone. Generally 1050 Hz is used for single tone RTT, but the 
radios and decoders must be programmable to other tones in the audio range. All tones 
must have a +/-0.2% frequency stability, and the tone length must be programmable to a 
pre-determined period of time from 0.5 to 2.5 seconds, in increments of 100 ms or less.

To use the single tone encoder functionality, program the radio with RTT with Single 
Tone Encoder selected as the type of RTT. The radio transmits and sends a tone of the 
programmed frequency and duration. When the tone is sent, all other radios on the system 
will hear the tone transmitted, and need to open audio.

The radio transmits five tones. The first four tones are the Five Tone ID of the radio. The 
last tone is based on the radio mode (Normal Call, Emergency Call, Secure Call).

MDC1200 is a signaling protocol designed and implemented by Motorola for analog 
channels only. The following features of this protocol are supported. Either MDC1200 or 
standard DTMF ANI/Emergency signaling can be programmed on each conventional 
system.

MDC1200 ANI - Both pre and post ANI are supported.

MDC1200 Emergency Alert - A retry counter is implemented. Currently, ACKs are 
not decoded so the radio retrys the programmed number of times with each emergency.

Inhibit/Uninhibit Commands - Commands to inhibit (disable) and uninhibit (enable) 
mobile access to the radio system.