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Martin Backmann, Dr. Christian Pfeiler, Andreas (马丁u2022Backmann基督教Pfeiler博士,安德烈亚斯)
CROSSTALK MODEL FOR PAIR-SHIELDED DATA CABLES Martin Backmann, Dr. Christian Pfeiler, Andreas Waßmuth NK Networks, Nuremberg, Germany ABSTRACT TRANSFER IMPEDANCE OF SINGLE SHIELDED PAIRS Due to the increasing demand for higher bandwidth the frequency and dynamic range covered by copper data cables is During the measurement of the transfer impedance of expanding. Generally well designed and produced cables using symmetrical cables the even-mode of a pair is considered and the technology of individually shielded pairs (S/STP) are capable can be regarded as a coaxial cable. If the outer conductor of the to provide a positive attenuation-to-crosstalk-ratio (ACR) even coax is a metal foil of the width b wrapped around the insulated for hundreds of MHz. inner conductor with a radius r, the lay length l, the thickness d and the conductivity ?, the transfer impedance can be calculated During the development phase from 100 MHz (Cat. 5, as follows /4/ ISO 11801) /1/ to 600 MHz (Cat. 6, E DIN 44312/5) /2/ especially 1 j r d (1) , crosstalk performance has to be improved. The
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