Preferred Cable Combinations

TIA/EIA 568-B.1 and ISO/IEC 11801 do more than simply define acceptable types of horizontal cabling. They define in what combinations such cables should be used. According to the standards, two horizontal links serve each work area .

The work area in Figure 7.3 shows a pair of links in typical usage. One serves the phone and the other serves the data device.

Table 7.2 shows cable combinations permitted by both standards. Here I have listed only the arrangements preferred by TIA/EIA 568-B.1-2001, not all the compliant possibilities.

ISO/IEC specifications are somewhat more permissive than TIA/EIA. Permissive standards proliferate unnecessary cable choices. For example, ISO/IEC permits substitution of category 3, 5e, 6, or 7 cables and substitution of practically any type of optical fiber for the items listed in Table 7.2

Based on my belief that fiber-to-the-desk won't happen any time soon, I tell users to install category 5e four-pair 100- W balanced cabling to both outlets.

Table 7.2. Preferred Horizontal Cable Combinations

TIA/EIA 568-B.1-2001

First outlet:

  • Four-pair, 100- W UTP, category 5e or better

Second outlet, any one of

  • Four-pair, 100- W UTP, category 5e or better
  • Two- strand , 62.5/125 m m fiber
  • Two-strand, 50/125 m m fiber

Fundamentals

Transmission Line Parameters

Performance Regions

Frequency-Domain Modeling

Pcb (printed-circuit board) Traces

Differential Signaling

Generic Building-Cabling Standards

100-Ohm Balanced Twisted-Pair Cabling

150-Ohm STP-A Cabling

Coaxial Cabling

Fiber-Optic Cabling

Clock Distribution

Time-Domain Simulation Tools and Methods

Points to Remember

Appendix A. Building a Signal Integrity Department

Appendix B. Calculation of Loss Slope

Appendix C. Two-Port Analysis

Appendix D. Accuracy of Pi Model

Appendix E. erf( )

Notes





High-Speed Signal Propagation[c] Advanced Black Magic
High-Speed Signal Propagation[c] Advanced Black Magic
ISBN: 013084408X
EAN: N/A
Year: 2005
Pages: 163
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