The Ultra Hard Metric (UHM) connector from 3M addresses these signal integrity limitations of unshielded 2mm HM connectors. Firstly, they are fully shielded with the lowest crosstalk high signal density of any 2mm HM Connector available today. Secondly, they are designed to be intermateable with standard 2mm HM vertical backplane headers. Thirdly, UHM connectors are controlled impedance and offer 7Gbps or higher performance when mated to standard 2mm HM headers. This is why PICMG has chosen the 3M™ UHM Socket for the J2 connector in its draft 2.30 standard.