8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide
–
PART II
January 2019
Page 99 of 153
MSU Scan
Supported MSU Scan Types
The MSU Scan feature is allowed while the DVR is active (System or Local Mode) if the
MSU Scan type is configured as one of the following:
•
Conventional
•
Multi-System Talkgroup
•
Priority Monitor
•
Voting
NOTE:
While the DVR is active, the Designated Voice Tx Member is
‘Selected Channel’
DVRS Enabled / Disabled Rules while MSU Scan is enabled
The Selected DVR channel settings are used across all MSU scan channels except when
the DVR operation is Disabled for the given MSU channel.
If the DVR selected channel is Digital and the MSU scans to an analog channel, the DVR
will become temporarily disabled.
If the Selected MSU channel is programmed as DVR Disabled, the DVR operation will
remain disabled even if the MSU scans to a channel which is DVR Enabled.
The DVR will become temporarily disabled if the MSU lands on a channel that is
programmed as DVR Disabled. In this scenario the DVR will not handle Outbound calls
received by the MSU but will still repeat Inbound PSU calls by reverting the MSU to its
selected channel.
Outbound Calls (received by MSU from the FNE) with MSU Scan Enabled
If the MSU is configured to only unmute to a specific TG ID or NAC, only the audio
containing the specified TG ID or NAC will be proxied by the DVR to the PSU.
Individual call signaling (Page, Call Alert, Message, Radio inhibit etc) originating from a
secondary (not the MSU selected) channel is not proxied by the DVR to the PSU.
Emergency Alarm / Call originating from a secondary channel are supported through the
DVR.
Inbound Calls (received by DVR from PSU) with MSU Scan Enabled
MSU Talkback and Designated TX are not supported when a PSU makes a call through
the DVR while the MSU has SCAN enabled. The MSU always moves back from the landed
to the selected channel when the PSU initiates a call through the DVR.
Talkback and Designated TX are supported only for MSU initiated calls.
