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Twisted-Pair (Balanced) Cabling

The categories of transmission performance specified by Siemon for cables, connecting hardware links and channels are:

Category 3 Transmission characteristics are specified up to 16 MHz. Meets applicable category 3 and class C requirements of ISO/IEC 11801:2002, ANSI/TIA/EIA-568-B.1 & B.2. Requirements are specified to an upper frequency limit of 16 MHz.
Category 5e Transmission characteristics are specified up to 100 MHz. Performs to category 5e of '568-B.1 & B.2 and additional class D requirements of ISO/IEC 11801:2002. Requirements are specified to an upper frequency limit of 100 MHz.
Category 6 Transmission characteristics are specified up to 250 MHz. Performs to category 6 of '568-B.2-1 TIA-TSB-155 draft, and class E requirements of ISO/IEC 11801:2002. Requirements are specified to an upper frequency limit of 250 MHz. This classification is a superset of Category 5e.
Category 6a Transmission characteristics are specified up to 500 MHz. Performs to category 6 of '568-B.2-1 and '568-B.2-10 and class E of ISO/IEC 11801:2002 and amendment NBS 1 to ISO/IEC 11801. Requirements are specified to an upper frequency limit of 500 MHz. This classification is specified with the additional requirements of TSB-155 to support the operation of 10GBASE-T over 4-connector channel to typologies over distances from at least 55m up to 100m.
Category 7 Transmission characteristics are specified up to 1.0 GHz. Performs to category 7 and class F requirements of ISO/IEC 11801:2002. Requirements are specified to an upper frequency limit of 600 MHz. This classification is an electrical superset of Category 6. Supports all parameters to 1.0 GHz for compliance to ISO/IEC 15018 and ISO/IEC 11801 Ed. 2, Amd. 1st draft.
Note:
Augmented category 6 draft requirements are still in development and are intended to be published before 2006.

Terminology and classifications specified in ISO/IEC 11801:2002 for cabling links differ slightly from TIA categories. Components and installation practices are subject to all applicable building and safety codes that may be in effect.