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OPC-10000-4 – OPC Unified Architecture - Part 4: Services5.13.1.5 Queue parameterstransfer by the Subscription . The size of the queue is defined when the MonitoredItem is created. When the queue is full and a new Notification is received, the Server either ... replaces the last value added to the queue with the new one. The MonitoredItem is configured for one of these discard policies when the MonitoredItem is created. If a Notification