Title :
Shielded or unshielded twisted-pair for high speed data transmission?
Author :
Knobloch, A. ; Garbe, H. ; Karst, J.P.
Author_Institution :
Inst. fur Grundlagen der Electrotehnik & Messtechnik, Hannover Univ., Germany
Abstract :
Balanced transmission is the standard method for data transmission via twisted pair cables. A separate shield for the balanced twisted pair is used to improve the immunity or emission behavior of the transmission line. The different performance of shielded or unshielded twisted pairs is investigated by numerical calculation with CONCEPT, a program based on the method of moments. In addition, a two-dimensional model with length independent partial capacitances was used. The effect of a shield is discussed with respect to transmission characteristics and EMI-behavior. The additional shield has a less significant influence to data transmission aspects than attenuation and reflection. The model of partial capacitances shows that the shielded twisted pair provides a better symmetry of signal transmission and improves the suppression of crosstalk
Keywords :
electromagnetic compatibility; electromagnetic interference; electromagnetic shielding; twisted pair cables; CONCEPT software; EMC; EMI; computer simulation; crosstalk suppression; emission behavior; high speed data transmission; immunity behavior; length independent partial capacitances; partial capacitances; shielded twisted-pair cables; signal transmission symmetry; two-dimensional model; unshielded twisted-pair cables; Attenuation; Cables; Capacitance; Conducting materials; Data communication; Insulation; Power transmission lines; Reflection; Transmission lines; Wire;
Conference_Titel :
Electromagnetic Compatibility, 1998. 1998 IEEE International Symposium on
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-5015-4
DOI :
10.1109/ISEMC.1998.750069
