Configuring a redundant RNC with remotely controlled A/B switches

On Motorola PMR networks you can configure a remotely controlled A/B switch to instruct the radio network controller (RNC) to send traffic to a specific Motorola private mobile radio (PMR) base station. You can configure mobile access services to send alert messages to a remotely controlled A/B switch attached to a redundant RNC 3000. You can define up to four switches.

About this task

In the absence of network traffic, the mobile access services sends out a heartbeat message to the RNC to make sure that it is still there. If the RNC does not respond to two consecutive heartbeat messages, then the mobile access services breaks the connection and attempts to reestablish the connection to the primary RNC. If the connection cannot be reestablished, the mobile access services switches control to the redundant RNC to establish a connection and resume normal processing. The mobile access services can send a simple network management protocol (SNMP) alert to the A/B switch. This process is done to tell it to switch the PMR base stations to the standby (redundant) RNC.


  • To configure an rnc3000 MNC with a redundant RNC and a remotely controlled A/B switch:
    1. Make sure that the rnc3000 MNC is added to the Connection Manager.
    2. Edit the properties of the rnc3000 MNC. For more information about editing properties, see Editing resource properties.
    3. Click the Line Driver page. Review the values of the IP address of RNC, TCP read port, and TCP write port that were assigned when the MNC was added.
    4. Click Modify redundant RNC configuration and enter the IP address of redundant RNC.
    5. Click Control A/B switch and enter the IP address of remote A/B switch.
    6. Enter the management information base (MIB) file used by the SafeLinx Server that describes the remote A/B switch.
    7. Enter the IP address of remote A/B switch and the IP addresses of up to three additional switches.
    8. Click the Remote A/B switch port mapping field to identify whether the port mapping labeled A on the remotely controlled A/B switch is connected to the primary or redundant RNC.
  • Whenever the primary and redundant RNCs are toggled, the mobile access services sends an alert to the A/B switch that specifies which RNC is active.