Single-Port 1G Network Interface Cards are optimized for OS X operating systems. The Single-Port 1G cards use advanced point-to-point connection to promote data-intensive transfers. These are employed mainly to improve network efficiency. The Single-Port 1G NICs support both optical and copper media and connect Ethernet shared storage solutions to these in a power-efficient manner. Cozlink Single-Port 1G NICs support Windows, Linux and OS X 10.7 or Later. These NICs support Link Aggregation and VLAN. Large transfers show increased performance. The Cozlink Single-Port 1G NICs are IEEE802.3z compatible and have features like Jumbo Frames, TCP checksum etc. These connectivity solutions are known to deliver GbE connectivity on cat-5 cable networks.