Digital communication cables can be used to connect indoor electronic equipment such as computers and TVs to prevent the interference of strong electromagnetic signals from the outside world and avoid the distortion of effective signals.
CAT7 Cable, more commonly known as a Cat7 or Cat-7 cable, is a type of high-end data transfer patch cable used in delivering the core infrastructure of wired Gigabit Ethernet setups.
CAT6 Cable is a standardized twisted pair cable for Ethernet and other network physical layers that is backward compatible with the Category 5/5e and Category 3 cable standards.
CAT6A Cable is made and terminated to tighter tolerances than Cat6. This means the copper conductors are twisted tighter. This requires higher specification patch panels, wall jacks, and RJ45 connectors.
http://www.cablemadeinchina.com/digital-communication-cable/patch-cord/