Over-The-Air Alert Tones Operation (L999_ Required); Battery (Ac Power Fail) Alert Tone Operation; Revert To Low Rf Power Operation - Motorola APX 7500 User Manual

Supported Features
One application of using the APCO interface, is the support of external MDC encoders/decoders.
• MDC Encoders – Consolettes can be connected to an external MDC encoder. Encoders
are typically used to generate tones that are provided to the Consolette via the audio
connection for transmit over the air. An associated Push-to-Talk signal is also provided
to key up the Consolette.
• MDC Decoders – Consolettes can be connected to an external MDC decoder. Tones
are received over the air by the Consolette and provided on the receive audio path on its
rear panel.
NOTE: The auxiliary (APCO) PTT input is mutually exclusive with the Crosspatch CP_PTT. As a
result, when Crosspatch is enabled, the APCO PTT is disabled and A(tx) is no longer
routed.
4.21

Over-the-air Alert Tones Operation (L999_ Required)

Over-the-air alert tones allow the Consolette operator to advise a fielded subscriber of a critical
communication. The Consolette supports this functionality from its front panel. There are three
predefined alert tones that can be assigned to either the softmenus underneath the auxiliary
display or to the dedicated programmable buttons. The predefined alert tones are:
• Alert 1 sends a 1 kilohertz tone
• Alert 2 sends a pulsed 1500 hertz tone alternating with an 800 hertz tone
• Alert 3 sends a pulsed 1500 hertz tone only
The alert tone is transmitted by the Consolette when the operator presses and holds the alert
softkey (or programmed button). The alert tone will continue to transmit for as long as the button is
pressed. After the button is released, the Consolette will remain keyed for a programmable period
of time (hangtime). The alert tone will be audible on the local speaker. When the operator hears
the alert tone stop, the operator will be able to resume normal Consolette operation (ex. key the
unit from any supported PTT source).
4.22

Battery (AC Power Fail) Alert Tone Operation

The Consolette can detect when it is operating on a DC input and as a result can generate an alert
tone to its local speaker, to a remote user via the wireline, and over-the-air if the Consolette is
currently transmitting. This is useful for when remote notification of an AC power failure at the
Consolette site is needed. This feature can be enabled in the Consolette codeplug.
This alert tone is predefined and is a 1200 Hz tone transmitted for a duration of 125mS, repeated
every 10 seconds. The alert is automatically cleared when AC power is restored.
4.23

Revert to Low RF Power Operation

The Consolette can detect when it is operating on a DC input and as a result can automatically
revert to using the low power setting as defined in the radio CPS on any future transmissions. This
will help extend the life of the backup battery in cases of AC power failure. Note that when AC is
restored, the Consolette will automatically revert back to the power settings defined in the APX
CPS for that selected channel. This Revert to Low RF Power Operation can be enabled/disabled
in the Consolette codeplug.
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