[CAUSE] The tmnxRadSrvPlcySrvOperStateCh notification is sent when the value of the object tmnxRadSrvPlcySrvOperState changes. A RADIUS server is reported as 'outOfService' when the system does not receive timely responses from that server, according to the values of the objects tmnxRadSrvPlcyTimeout and tmnxRadSrvPlcyRetry. It is reported as 'overloaded' when the system crosses the pending-requests-limit for that server. [EFFECT] While the value of the object tmnxRadSrvPlcySrvOperState is equal to 'outOfService' or 'overloaded', - the corresponding RADIUS server is out of use; - traffic is sent to other RADIUS server(s) associated with the same policy, depending on the value of the object tmnxRadSrvPlcyAlgorithm. - after the time specified in the object tmnxRadSrvPlcyDownTime has elapsed, the state changes to 'unknown'. While the value of the object tmnxRadSrvPlcySrvOperState is equal to 'unknown', the system sends traffic to the RADIUS server; if it replies timely, the operational state will change to 'inService', otherwise to 'outOfService'. [RECOVERY] The communication with the RADIUS server should recover after some time. Otherwise, or if it becomes out of use too frequently, the capacity of the RADIUS server(s) may have to be increased, or the values of the objects mentioned above may have to be adapted.