8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide
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PART II
January 2019
Page 116 of 153
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DVRS in SYSTEM or LOCAL Mode, Digital Channel Selected
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MSU that DVR is interfaced to receiving Group Services while on P25 Trunked
FDMA
Mode
The following Group Services can be supported by the DVRS:
Group Text
Group text is an unconfirmed message that is sent to all members of a talkgroup. The
DVRS passes the Group Text messages to the local PSUs. If the Local ‘DVRS Enabled’
PSU users want to receive only Group Text Messages sent to the PSU selected
Talkgroup
, then the PSU must be programmed for ‘Selective Squelch’ instead of the
default ‘Normal Squelch’. If programmed for ‘Normal Squelch’, the Local PSU will receive
all Group Text Messages proxied by the DVRS regardless of the Talkgroup currently
selected on the PSU.
NOTE:
The above also applies to voice calls in general
– if the Local PSU users want their PSUs
to only unmute to the PSU selected Talkgroup, then they need to program ‘Selective
Squelch’ in the PSU. If they are using the default ‘Normal Squelch’ setting, the PSUs will
unmute to all calls proxied by the DVRS regardless of the incoming call Talkgroup.
Group Alias Update
Group Alias update is a message sent to a given Talkgroup while on a voice channel to
alert the receiv
ing radio of the transmitting radio’s alias/ID configured in the Provisioning
Manager on the console. The updated Group Alias data is received by the members of
the Talkgroup and their Unified Call List (UCL) is updated. The DVRS passes the Group
Alias Upd
ate to the local ‘DVRS Enabled’ PSUs so that their UCLs can get the update
even while they are not directly connected to the trunked system but are proxied via the
DVRS.
NOTE:
The updated Alias will be displayed on the receiving PSU only when the PSU is directly
affiliated on the Trunking system. When affiliated through the DVRS, the PSU will still
display the Unit ID of the transmitting PSU but it will not display the programmed or the
updated Alias for that transmitting Unit ID.
NOTE:
When the MSU is operating on TDMA mode, the MSU may receive group services but will
not proxy those to the DVRS / Local PSUs.
