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14221-1850-2000, Rev. A

4.27.2 Receiving an Emergency Call

When receiving an Emergency Call, an alert beep sounds (if tones are enabled) and an emergency indication

is displayed. The unit ID and/or unit name of the unit in emergency is displayed. While the emergency

display is active, press PTT to respond to the emergency caller.

4.27.3 Stealth Emergency

The radio can be programmed with the following emergency behavior:

• No audio indications when declaring an emergency.

• No visual indications when declaring an emergency.

• No audio and no visual indications when declaring an emergency.

During stealth mode, the radio will not receive any type of call. Once the user presses the PTT button, the

radio display and audio return to normal.

4.28 MDC-1200 (ANALOG CONVENTIONAL ONLY)

MDC-1200 is a legacy in-band signaling protocol that provides the radio with the ability to transmit and

receive a unique PTT ID. This PTT ID can be decoded by receiving radios and displayed as a hexadecimal

number or an alias string. In addition, MDC-1200 provides radios with the ability to transmit emergency

status to a console. Refer to the MDC-1200 Feature Manual, publication number 14221-7200-6000, for

complete instructions on configuring and using this feature.

4.28.1 Normal PTT Operation

If MDC signaling on PTT press is enabled using RPM2, the radio transmits an MDC PTT ID message when

PTT is pressed. If the Sidetone option is enabled using RPM2, the radio plays a Ready-to-Talk (RTT) tone

after the MDC pre-signaling has been transmitted.

If MDC signaling on PTT release is enabled (using RPM2), the radio transmits post-call MDC signaling

when PTT is released.

• IF STE is enabled (using RPM2), the MDC post-call signaling is transmitted after STE is sent on PTT

release only.

• MDC post-call signaling is also sent when there is a radio unkey due to Carrier Control Timeout (CCT).

Normal CCT alert tones occur prior to unkey.

4.28.2 MDC PTT ID Receive Handling

When the radio receives an MDC PTT ID, it searches the MDC ID Alias List for an alias associated with

the ID. If one is found, it displays the alias. If none is found, the radio displays the ID in hexadecimal.

Harris XL Series User Manual

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