GB/T 18015.6-2007 Multicore and symmetrical pair/quad cables for digital communications—Part 6:Symmetrical pair/quad cables with transmission characteristics up to 600 MHz—Work area wiring—Sectional specification

Scope

This part is used together with GB/T 18015.1—2007. This cable is specifically designed for the jumper connections of D, E, and F-grade channels defined in ISO/IEC 11801:2000, as well as for soft cables in equipment and work areas (see Table 1). This part applies to twisted pairs or four-wire groups with four or fewer pairs, including single-shielded (STP), fully shielded (FTP), and unshielded (UTP) cables. It specifies the transmission characteristics of the cable at 20°C. The performance of the cable at temperatures above 20°C is discussed in Appendix A of GB/T 18015.5—2007. The term "Category 5e" in this part refers to enhanced Category 5 cables, which are used in the same scope as Category 5 cables in ISO/IEC 11801. This enhanced cable is designated as Category 5e to distinguish it from Category 5 cables described in GB/T 18015–2, GB/T 18015–3, and GB/T 18015–4. Although both Category 5 and Category 5e cables have a 100 MHz specification and can be used in D-grade channels, Category 5e cables meet additional requirements that make them more suitable for systems that use four pairs for bidirectional simultaneous transmission. **Table 1: Cable Classes** Cable Class[] Maximum Reference Frequency/MHz[] Channel Level Category 5e[] 100a[] D Category 6[] 250[] E Category 7[] 600[] F a Some characteristics are tested up to 125 MHz to comply with IEEE’s requirement of specifying cable performance at a frequency 25% higher than the reference frequency. These cables can be used in various communication systems under development or simultaneously employing up to four pairs. In this sense, this part provides system developers with the cable characteristics needed to evaluate new systems. The cables included in this part should operate under the voltage and current typically used in communication systems. These cables should not be connected to low-impedance power sources such as public power supplies. Although the recommended installation temperatur

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