Physical layer of high-end network system uses multiple interface arrays. Under the load-balancing perspective, light
load can be distributed to multiple interfaces. However, it can cause energy inefficiency in terms of the number of poor
utilization interfaces. To tackle this energy inefficiency, traffic off-balancing algorithm for traffic adaptive interface
sleep/awake is investigated. As a reference model, 40G/100G Ethernet is investigated. We report that suggested
algorithm can achieve energy efficiency while satisfying traffic transmission requirement.