Description: Specifies the time intervals at which the data should be fetched for this data group. This object's value is used only when the collection mode of the associated cdcVFileEntry is automatic (see cdcVFileCollectMode).

A periodic timer is started for this data group when cdcDGRowStatus is set to 'active', provided the associated cdcVFileEntry has already been 'activated', otherwise it is started when the associated cdcVFileEntry is finally activated.

The time interval after which the first expiration of this timer should occur, is calculated as follows:

(value of sysUpTime.0) + (value of cdcPollPeriod for this entry - (value of sysUpTime.0 - VFile activation time for the associated cdcVFileEntry) % cdcPollPeriod)

Subsequent expirations of the periodic timer can occur as per the value specified in cdcDGPollPeriod. This helps in synchronizing periodic polling of the data groups with respect to the VFile activation time.

This object's value may be modified at any time, and the change must take effect immediately. i.e. if the periodic timer has been started, it's expiry time may need to be re-adjusted.