• Category 1 is POTS (plain old telephone service) and Low-Speed Data (up to 9600 bps).• Category 2 is Integrated Services Digital Network (ISDN) Data (up to 4 Mbps).• Category 3 is Data Grade Media Local Area Networks (up to 16 Mbps).• Category 4 is Extended Distance Local Area Networks (up to 20 Mbps).• Category 5 is Data Grade Media (up to 100 Mbps).• Category 5e is currently the minimum TIA recommended category of wiring for new installations. Electrical characteristics for NEXT, FEXT, ELFEXT, PSNEXT, PSELFEXT, delay skew, propagation delay, attenuation, and return loss are specified to 100MHz. Category 5e was developed with the specific intent of supporting Gigabit Ethernet. Because all TIA standards require backwards compatibility, Category 5e will also support all lower-rated categories and protocols such as 10/100 Base-T.•Category 6 is gaining popularity for new installations. Electrical characteristics for NEXT, FEXT, ELFEXT, PSNEXT, PSELFEXT, delay skew, propagation delay, attenuation, and return loss are specified to 250MHz. Improvements in all electrical parameters are part of the higher TIA Category 6 standard. Category 6, while providing a “bigger pipe” for improved throughput, also has a maximum 100 meters of support for Gigabit Ethernet transmission.• Augmented Category 6 is the cutting edge of UTP cabling. It is similar to Cat 6, but is characterized to 500MHz and is also capable of running 10Gigabit Ethernet protocols of the future. Testing parameters are similar to that of Cat 5e and Cat 6, with the added benefit of compliance to Alien (Bundled) Crosstalk requirements.•Category 7 is a proposed standard for a fully shielded, 4-pair cabling system with transmission specifications referenced to 600MHz. The cable end interface will probably be something other than the familiar RJ45 connector, mainly to differentiate the Category 7 installation from existing lowerbandwidth infrastructure. Because of the higher costs associated with manufacturing and installing these shielded products, their scope of usability is extremely limited in North America (<1%).
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