9-7.1 System Initiated Dispatch Astro
Signaling
The trunking analyzer sends a link control data
word on the voice channel frequency. The radio
receives the control channel message to move to
the voice channel and switches to that voice
channel. When the radio detects the link control
data word, the radio unmutes and stays on the
voice channel until the test is terminated.
To set up testing, select the Trunk mode by
placing the cursor in the "Mode:" field and
pressing the TRUNK softkey. Place the cursor in
the "Meter:" field and press the SYSTEM INIT
softkey to view current data and test status for a
system initiated trunked test sequence. Within the
Display zone, place the cursor in the "Sig Type:"
field and press either the ASTRO VSELP or
ASTRO IMBE softkey. Refer to Section 8 for a
description of ASTRO vocoder configurations. In
this example, the ASTRO IMBE softkey is
pressed. A screen similar to figure 9-5 appears.
IMBE
Figure 9-5. Dispatch Test Screen System Initiated Astro Signaling
144
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