With the latest advances in optical high-performance networks, connectors are becoming ever more crucial components in passive fiber optic infrastructure. High-quality connectors ensure optimum transmission rates and constant network availability in all areas, from WAN to metropolitan area and campus networks, as well as backbone networks and subscriber connections. They cannot do their job if they have even the smallest bit of dirt on them. Why is dirt so bad? Dirt, along with damage such as scratches and cavities, is one of the main causes of 3 problems related to return loss.