| ANSI/EIA/TIA Standards
Category 1
Typically 22 AWG or 24 AWG untwisted wire.
Used for voice and low speed data transmission rates, up to 56Kbps.
Category 2
Typically 22 AWG or 24 AWG solid wire, twisted pairs.
Used for low speed LAN data communications, up to 1Mbps, such as Appletalk and IBM 3270 connections.
This cable is not tested for near-end crosstalk.
Category 3
24 AWG solid wire, twisted pairs.
Characteristics of these cables are specified up to 16Mhz.
Used used up to 10Mbps (IEEE 802.4 4Mbps UTP annex and IEEE 802.3 10BaseT).
Typical impedance is 100 Ohms.
Category 4
22 AWG or 24 AWG solid wire, twisted pairs.
Characteristics of these cables are specified up to 20Mhz.
Used up to and including 16Mbps (IEEE 802.5 16Mbps UTP Draft).
Typical impedance is 100 Ohms.
Category 5
22 AWG or 24 AWG unshielded twisted pair.
Characteristics of these cables are specified up to 100 MHz.
Used up to and including 100Mbps (IEEE 802.5 16Mbps UTP Draft and ANSI.
X3T9.5 100Mbps TPDDI Standard, and 100BaseTX standard).
Typical impedance is 100 Ohms.
Category 6
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