USBD Location Polling in Capacity Max
USBD Location Polling provides GPS location delivery through the Control Channel using a request and response mechanism. The feature requires TRBOnet version 6.2 or newer and Motorola Capacity Max version 2023.01 or newer. A detailed technical description of the feature is available in the article by Wayne Holmes on the cwh050 blog.
USBD Location Polling is not compatible with encryption.
Notes
• A Subscriber Unit may not respond to a USBD Poll Request when the unit is in a call or out of coverage.
• USBD Polling is suspended during Mass Re-Registration.
• Supported in Advantage Mode, Open System Mode, and Open Radio Mode.
• Supported only in Dedicated Control Channel Mode. Not supported in Shared Control Channel Mode.
• Only SLR series repeaters support Control Channel operation.
• All subscriber models supported in Capacity Max support USBD Location Polling.
• Supported only in Wide Area mode. Site Trunking mode does not support USBD.
CMSS Configuration
1. Open .
2. In Set Categories select .
3. Select the target system and choose .
4. In the General section enable .
Radio Subscriber Configuration
1. Open the subscriber codeplug.
2. Open Zone and Channel configuration.
3. Select a zone with Capacity Max personalities.
4. Select the Capacity Max personality.
5. Enable .
TRBOnet Configuration
1. Open .
2. Open . Create a new profile or edit the Default profile.
3. Set Protocol type to .
4. Enable .
5. Open the tab. Enable and set the update interval.
6. Open the tab. Enable .
This prevents simultaneous traffic from periodic triggers and USBD Polling.
Behaviour and Limitations
• USBD uses one control channel slot per request.
• Control Channel load increases with short polling intervals.
• Periodic updates must be disabled when USBD Polling is active to avoid redundant traffic.