2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

IEEE Transactions on Microwave Theory and Techniques
Volume 48 Number 5, May 2000

Table of Contents for this issue

Complete paper in PDF format

A Novel Simplified Four-Port Scattering Parameter Model for Design of Four-Pair Twisted-Pair Cabling Systems for Local Area Networks

Chun-Wen Paul Huang, Charles E. Smith, Life Senior Member, IEEE Atef Z. Elsherbeni, Senior Member, IEEE and Bernard H. Hammond Jr.

Page 815.

Abstract:

This paper presents a set of simplified equations based on a four-port scattering model, which accurately characterizes four-pair twisted pair (eight-port) cabling systems for high-speed digital telecommunication local area networks. These equations are derived and simplified from two-stage cascaded four-port S-parameter matrices and verified experimentally. Excellent agreement is obtained between the measurements and computational results when the S-parameters of the cabling system components are known. These equations not only reduce the computation burdens in comparison with traditional methods for transmission matrix computations, but also provide intuition of the contributions of the S-parameters at each stage in the net crosstalk, return loss, and insertion loss. Furthermore, these equations can be used to compute the component specifications when the system performance is specified, and to obtain the deembedded system characteristics by subtracting the known characteristics of adapters.

References

  1. "Commercial Building Telecommunications Cabling Standard", Oct. 1995.
  2. D. M. Pozar, Microwave Engineering, Reading, MA: Addison-Wesley, 1993, pp.  231-234. 
  3. D. Kajfez, Notes on Microwave Circuits, Oxford, U.K.: Kajfez Consulting, 1989,vol. 1, pp.  243-250. 
  4. H. Koeman, "Overview proposed performance specifications for CAT 5, CAT 5E, CAT 6 and CAT 7 cabling NEXT loss, attenuation, ELFEXT loss and return loss", presented at the ISO/IEC 1998 Meeting,.
  5. D. Kajfez, Notes on Microwave Circuits, Oxford: U.K.: Kajfez Consulting, 1989,vol. 2, pp.  1-17.