cat6

Cat 6 or Category 6 is a set of performance characteristics for cabling systems based on 4-pair twisted pair cables. Similar in structure to the earlier Category 5 and Category 5e standards, Category 6 describes cabling components that are able to support much higher frequency signals of up to 250 MHz on 100m meter distances that became standard with the earlier cabling standards.

Category 6 specification has initially been proposed to support 1000Base-TX (using two pairs only) application which  never actually became mainstream. A much more prevalent and de-facto standard for all new computers 1000Base-T Gigabit Ethernet (using all four pairs) works over the much cheaper Category 5e cables. Because of that Category 6 acceptance has been very slow until the recent years with the advent of the faster 10GBase-T 10 Gigabit Ethernet. Even then Category 6 components did not provide adequate bandwidth for the entire 100 meters length of the cabling channel and had to be supplemented with a newer, Category 6A (augmented) specification.

You can find Category 6 talked about on sites like BICSI and Cabling Design.

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