Unfortunately, unshielded 2mm HM connectors are limited by their susceptibility to crosstalk especially in applications requiring higher signal densities combined with higher data rates. Severe crosstalk – shown by the white bands on this eye pattern – is due to lack of isolation between neighboring signals making unshielded 2mm Hard Metric connectors unusable in high speed, high signal density applications. Consequently designers have had to sacrifice signal pins and convert them to grounds thus significantly reducing number of channels available for signal transmission.