dPMR Mode 3

Digital Trunking Mode   


This is the full functionality of dPMR that can be offered by managed access, multi-site, complex systems including all the same interfaces and gateways as Mode 2.

dPMR Mode 3 is the final step where all the possible functionality of the protocol is available. Mode 3 can offer multi-channel, multi-site radio networks that are fully managed by specific beacon channels at each radio site. This ensures optimum use of spectrum and optimum density of radio traffic. Management of the radio network starts from the authentication of radios that wish to connect. In a dPMR Mode 3 digital trunking system, when a user requests a call through a dedicated control channel, the trunking controller automatically allocates one of the traffic channels and sets up the call. The system can accommodate a large number of users on a limited number of repeater channels with high efficiency. The System Control Software can interconnect multiple trunking controllers over an IP network, so the system can be expanded from a single site system to multiple sites and increases coverage.

Calls are set up by the infrastructure when both parties have responded to the call request, ensuring optimum use of the radio resource. Calls may be diverted to other radios, landline numbers or even IP addresses. The infrastructure managing these beacon channels would be capable of placing a call to another radio, whether that radio is using the same site or another site within the network. As the allocation of communication channels is made dynamically, the system can further optimise traffic by dynamically modifying permitted call times. Radios that fail authentication can be blocked, either temporarily or permanently. 

The system will allow radios with the authority to make priority or emergency calls to pre-empt the use of channels from users making non-priority calls. Where call requests exceed capacity, these calls can be queued by the system until resources become available. All the services and functions available in Mode 1 and 2 are possible with a few exceptions, as well as several extra functions implemented by the beacon channel infrastructure.


Click here to view and download the Icom dPMR brochure.




Centralised Control Channel Trunking


The dPMR Mode 3 trunking system uses a centralized control channel system. The control channel is independent of the traffic channels and continuously transmits a control signal. The system allocates a traffic channel for the whole duration of a call and can provides quick response during a series of calls. The dPMR Mode 3 trunking system is suited to controlling a large number of users and congested traffic channels.

  • Up to 32 channels per site
  • Minimum 2 channel single site trunking
  • Up to 32 site multi-site trunking with System Control Software, CS-FC5000SCS
  • Channel license system. Four channel activation key is supplied with the IC-FC5000E
  • CS-FC5000 web based management software allows to connect multiple clients
  • Individual and group calls, including broadcast
  • Status call
  • Short data message
  • Call Queuing
  • Emergency Call with Pre-emption


Continued Feature Enhancements (Planned)

In combination with various applications or external devices, the following services will be provided.

  • Telephone interconnect
  • 3rd party application interface
  • Voice recording
  • System administration enhancements