Therefore, the bulkiness and weight of copper cables make a terribly inelegant system communication solution. Copper cables may be a somewhat feasible solution for small data center clusters. However, for large clusters, the link distance and the actual layout of the cluster makes it physically challenging to manage and operate. Overall, copper cables make for a messy and complicated data center design solution. In addition, due to the nature of electrical signals, electromagnetic interference (EMI) limits both the performance and overall reliability of copper.