10515-0372-4200, Rev. R
41
3.32 OTAR SCREENS
The OTAR screen is shown in Table 3-5. OTAR must be enabled (see Section 4.1.8).
Table 3-5: OTAR Display Messages
This is the main scre
en showing the OTAR status
(receiving/transmitting, registering, and rekeying).
3.33 MDC-1200 (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, 14221-7200-6000, for complete
instructions on configuring and using this feature.
3.33.1 Normal PTT Operation
If MDC signaling on PTT press is enabled in RPM, the radio transmits an MDC PTT ID message when
PTT is pressed. If the Sidetone option is enabled in RPM, 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 (in RPM), the radio transmits post-call MDC signaling when
PTT is released.
• IF STE is enabled (in RPM), 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.
3.33.2 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.
3.33.3 Emergency Declaration
Emergency declaration is accomplished by the radio generating an MDC Emergency PTT message. An
Emergency is considered acknowledged when the radio receives an “Ack To Emergency” PTT message
with an ID which matches its own ID. If Emergency Audio is enabled and the PTT Sidetone option is
enabled, the radio plays the Ready-to-Talk tone after the MDC Emergency PTT signaling is transmitted.
• If an MDC Alert on ACK is enabled, the radio plays an ACK tone when the MDC emergency is
acknowledged.
• If audio tones are enabled, the radio plays an ACK tone if the emergency is not acknowledged within
the programmed number of retries.
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