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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
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on PTT release only.
MDC post-call signaling is also sent when there is a radio unkey due to Carrier Control
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Timeout (CCT). Normal CCT alert tones occur prior to unkey.
5.35.2 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.
5.35.3 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.
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If an MDC Alert on ACK is enabled, the radio plays an ACK tone when the MDC emergency
is acknowledged.
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If audio tones are enabled, the radio plays an ACK tone if the emergency is not acknowledged
within the programmed number of retries.
5.36 MULTIGROUP (P25 TRUNKING ONLY)
Multigroup is an implementation of announcement call functionality for P25 Trunking. There are
two aspects to this: the multigroup itself and subgroups of the multigroup. Both the multigroup
and its subgroups are talkgroups within a P25 group set. For any given P25 group set, a single
multigroup and up to 32 sub-groups can be defined.
When tuned to the multigroup, the radio will:
Transmit calls across the multigroup and its subgroups. This is commonly referred to as
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multigroup call.
Receive all transmissions made on the multigroup and its subgroups.
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Halt any ongoing scan operation.
When tuned to a subgroup, the radio will:
Transmit calls across the currently selected subgroup.
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Transmit calls across the multigroup if a multigroup call is received and PTTs during the hang
time. For this to happen, the system must be configured to allow keyback on the multigroup.
If keyback is not configured, the radio will always transmit across the subgroup.
Receive all transmissions made on the multigroup and the currently selected subgroup.
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14221-1800-2050, Rev. G
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