A string to be carried on notifications of types 1 to 4 identifying the event which caused it. The format of this string is as follows. Field 1 - type of notification, e.g. warning, critical, etc. Field 2 - data source, e.g. inputs. Generally this relates to a particular MIB branch. Field 3 - channel number, e.g. input 1. Field 4 - event, i.e. what caused the trap. Field 5 - value at which the event occured, e.g. 900, indicating 90% humidity. Field 6 - type of data, e.g. relative humidity Fields are omitted if not relevant to a particular notification.