Packet Order Correction (POC) is one technique for minimizing packet loss, another is Forward Error Correction( FEC). While forward error correction works with reconstruction data, the method for determining the correct packet order starts at the edge devices ofwide- area networks.
In Packet Order Correction, data packets are tagged before they are transmitted over a WAN link. With this tagging, each data packet is assigned a number that ensures that the data packets can be put into the correct order after they are received. This method can be used to coordinate data packets that do not arrive in the correct order. Packet Order Correction can be handled by routers or separate appliances in real time. To ensure that even long packet sequences can be coordinated correctly, the appliances are equipped with appropriately large caches.