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When you are putting together a data centre, everything has to be connected together; most good [link widoczny dla zalogowanych] data centres will have enough data flowing to completely overwhelm [link widoczny dla zalogowanych] the standards bodies that rate these, this is CAT 3 cable, and is all but unheard of in any kind of new built network architectures, though in legacy configurations where low bandwidth is acceptable, [link widoczny dla zalogowanych] many installations of CAT 3 were never pulled and upgraded [link widoczny dla zalogowanych] to CAT [link widoczny dla zalogowanych] 5.
CAT-2 was used for an older architecture type called Token Ring (promulgated by IBM with the PS/2 systems). CAT 4 is an updated version of CAT 2 with better shielding and transmission properties.
The most basic of the modern cable types used in networking is Category 5, or Cat-5. This twisted pair [link widoczny dla zalogowanych] cable is shielded, and has a grounding line, allowing it to go for much longer runs than the CAT-3 cables that preceded it; it originally hit the scene in the mid '90s, and while more expensive at the time, quickly supplanted the prior cable types for anything driven by the TCP/IP networking stack.
Incremental improvements were made in both the protocols and the network adapters that used CAT 5, and its capacity has gradually increased as networking standards have grown; each increase in the capacity of the cable has resulted in a [link widoczny dla zalogowanych] greater need for shielding [link widoczny dla zalogowanych] to prevent packet loss and other interference artefacts; this has resulted [link widoczny dla zalogowanych] in a partial upgrade to [link widoczny dla zalogowanych] the standard called CAT5E. CAT-5E is also called Gigabit Ethernet cabling, and is the likeliest cable that you would be buying for a consumer networking connection.
On [link widoczny dla zalogowanych] the horizon (meaning it's primarily used for high end connectivity at this point) is CAT 6 cabling, which offers significant cross talk reduction from CAT5E, and has about a fivefold increase in bandwidth. This standard has also been extended by some cable vendors, who have created 10 Gigabit Ethernet, and the cables they use are commonly called CAT-6E. The CAT-6E standard was codified in February of 2008.
CAT 7 is a future standard, and is still being worked on; there are some facilities using pre-release [link widoczny dla zalogowanych] versions of this standard for high data bandwidth apps, mostly for [link widoczny dla zalogowanych] use in full motion video transfers, and radiology [link widoczny dla zalogowanych] departments. Up until the CAT-6E standard, CAT7 was the only 10GBASE-T implementation that could handle the full bandwidth for a full hundred meters; it's uncertain whether it will be supplanted by CAT-6E, or, as is likely, it will become the baseline for future extensions of bandwidth.