One-way delay measurement provides a MEP with the ability to check unidirectional delay between MEPs. An ETH-1DM packet is timestamped by the generating MEP and sent to the remote node. The remote node timestamps the packet on receipt and generates the results. The results, available from the receiving MEP, indicate the delay and jitter. Jitter, or delay variation, is the difference in delay between tests. This means the delay variation on the first test is not valid. It is important to ensure that the clocks are synchronized on both nodes to ensure the results are accurate. NTP can be used to achieve a level of clock synchronization between the nodes.