8A083X30 Rev.11
APX Series P25 Interface
DVRS
User’s Guide
January 2019
Page 46 of 94
MSU Scan
Supported MSU Scan Types
The MSU Scan feature is allowed while the DVRS is active (System or Local Mode) if
the MSU Scan type is configured as one of the following:
•
Trunking Scan
•
Conventional Scan
•
Mixed Conventional Voting Scan
•
Legacy Voting Scan
•
Multi System Scan
•
Priority Monitoring
The MSU does not support any other modes of scan operation, apart from those listed
above, while the DVRS operates in SYSTEM or LOCAL mode. In such unsupported
cases, the MSU will automatically suspend scan operation when the DVRS is set to
SYSTEM or LOCAL mode of operation and resume it when the DVRS is OFF.
NOTE:
The LPSU calls will be repeated on the MSU Selected Channel.
DVR Enabled / Disabled Rules while MSU Scan is enabled
The Selected DVRS channel settings are used across all MSU scan channels except
when the DVRS operation is Disabled for the given MSU channel.
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 DVRS 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 DVRS to the PSU.
Emergency Alarm / Call originating from a secondary channel are supported through the
DVRS.
Inbound Calls (received by DVRS from PSU) with MSU Scan Enabled
MSU Talkback and Designated TX are not supported when a PSU makes a call through
the DVRS 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 DVRS.
Talkback and Designated TX are supported only for MSU initiated calls.
