As power utilities worldwide embark on smart grid projects such as grid modernization, substation automation, distribution automation and advanced metering infrastructure, they face the challenge of migrating legacy mission-critical traffic from TDM-based transport networks to new IP/MPLS-based communications networks. Legacy mission-critical applications, such as teleprotection applications, demand stringent and deterministic transport. Of the various protection schemes, differential protection further requires symmetric delay. This application note explains how a Nokia IP/MPLS network can help network operators to meet the challenge of migrating legacy mission-critical traffic and also engineer the network to meet their general requirements. This application note also explains how the innovative capability and asymmetric delay control (ADC) of a Nokia IP/MPLS network can counter the random jitter nature of packet network traffic and attain delay symmetry.