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BSI PD IEC TS 61156-1-2:2023 – TC:2024 Edition

BSI PD IEC TS 61156-1-2:2023 – TC:2024 Edition

$280.87

Tracked Changes. Multicore and symmetrical pair/quad cables for digital communications – Electrical transmission characteristics and test methods of symmetrical pair/quad cables

Published By Publication Date Number of Pages
BSI 2024 190
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PDF Catalog

PDF Pages PDF Title
1 30485182
113 A-30465151
114 undefined
116 CONTENTS
119 FOREWORD
121 1 Scope
2 Normative references
3 Terms, definitions, symbols, units and abbreviated terms
3.1 Terms and definitions
122 3.2 Symbols, units and abbreviated terms
124 4 Basic transmission line formulae
4.1 Overview
125 4.2 Complex characteristic impedance and propagation coefficient formulae
4.2.1 General
4.2.2 Propagation coefficient
126 4.2.3 Complex characteristic impedance
128 4.2.4 Phase and group velocity
129 4.3 High frequency representation of secondary parameters
131 4.4 Frequency dependence of the primary and secondary parameters
4.4.1 Resistance
4.4.2 Inductance
4.4.3 Complex characteristic impedance
132 4.4.4 Attenuation coefficient
4.4.5 Phase delay and group delay
133 5 Measurement of the complex characteristic impedance
5.1 General
Figures
Figure 1 – Secondary parameters extending from 1 kHz to 1 GHz
134 5.2 Open/short circuit single-ended impedance measurement made with a balun (reference method)
5.2.1 Principle
135 5.2.2 Test equipment
5.2.3 Procedure
Figure 2 – Diagram of cable pair measurement circuit
136 5.2.4 Expression of results
5.3 Function fitting the impedance magnitude and angle
5.3.1 General
5.3.2 Impedance magnitude
138 5.3.3 Function fitting the angle of the complex characteristic impedance
139 5.4 Complex characteristic impedance determined from measured phase coefficient and capacitance
5.4.1 General
5.4.2 Formulae for all frequencies case and for high frequencies
140 5.4.3 Procedure for the measurement of the phase coefficient
141 5.4.4 Phase delay
Figure 3 – Determining the multiplier of 2πradians to add to the phase measurement
142 5.4.5 Phase velocity
5.4.6 Procedure for the measurement of the capacitance
5.5 Determination of the complex characteristic impedance using the terminated measurement method
143 5.6 Extended open/short circuit method using a balun but excluding the balun performance
5.6.1 Test equipment and cableend preparation
5.6.2 Basic formulae
5.6.3 Measurement principle
144 Figure 4 – Measurement configurations
Figure 5 – Measurement principle with four terminal network theory
146 5.7 Extended open/short circuit method without using a balun
5.7.1 Basic formulae and circuit diagrams
148 5.7.2 Measurement principle
Figure 6 – Admittance measurement configurations
Figure 7 – Admittance measurement principle
149 5.8 Open/short impedance measurements at low frequencies with a balun
151 5.9 Complex characteristic impedance and propagation coefficient obtained from modal decomposition technique
5.9.1 General
5.9.2 Procedure
152 5.9.3 Measurement principle
Figure 8 – Transmission line system
154 5.9.4 Scattering matrix to impedance matrix
156 5.9.5 Expression of results
6 Measurement of return loss and structural return loss
6.1 General
6.2 Principle
157 7 Propagation coefficient effects due to periodic structural variation related to the effects appearing in the structural return loss
7.1 General
7.2 Formula for the forward echoes caused by periodic structural inhomogeneities
159 8 Unbalance attenuation
8.1 General
160 8.2 Unbalance attenuation near end and far end
Figure 9 – Differential-mode transmission in a symmetric pair
Figure 10 – Common-mode transmission in a symmetric pair
161 Tables
Table 1 – Unbalance attenuation at near end
Table 2 – Unbalance attenuation at far end
Table 3 – Measurement set-up
162 8.3 Theoretical background
Figure 11 – Circuit of an infinitesimal element of a symmetric pair
165 9 Balunless test method
9.1 Overall test arrangement
9.1.1 Test instrumentation
Figure 12 – Calculated coupling transfer function for a capacitive coupling of 0,4 pF/m and random ±0,4 pF/m (=100 m; (r1 = (r2 = 2,3)
Figure 13 – Measured coupling transfer function of 100 m Twinax 105 Ω
166 9.1.2 Measurement precautions
9.1.3 Mixed mode S-parameter nomenclature
167 Figure 14 – Diagram of a single-ended 4-port device
Figure 15 – Diagram of a balanced 2-port device
168 9.1.4 Coaxial cables and interconnect for network analysers
9.1.5 Reference loads for calibration
Table 4 – Mixed mode S-parameter nomenclature
169 9.1.6 Calibration
Figure 16 – Solution for calibration of reference loads
170 9.1.7 Termination loads for termination of conductor pairs
Figure 17 – Resistor termination networks
171 9.1.8 Termination of screens
9.1.9 Calibration
9.1.10 Establishment of noise floor
9.2 Cabling and cable measurements
9.2.1 Insertion loss and EL TCTL
Table 5 – Requirements for terminations at calibration plane
173 9.2.2 NEXT
Figure 18 – Insertion loss and EL TCTL
174 Figure 19 – NEXT
175 9.2.3 ACR-F
176 Figure 20 – FEXT
177 9.2.4 Return loss and TCL
178 9.2.5 PS alien near-end crosstalk (PS ANEXT-Exogenous crosstalk)
Figure 21 – Return loss and TCL
180 Figure 22 – Alien NEXT
181 9.2.6 PS attenuation to alien crosstalk ratio, far-end crosstalk (PS AACR-F- Exogenous crosstalk
182 Figure 23 – Alien FEXT
184 Annex A (informative)Example derivation of mixed mode parametersusing the modal decomposition technique
Figure A.1 – Voltage and current on balanced DUT
186 Figure A.2 – Voltage and current on unbalanced DUT
188 Bibliography

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BSI PD IEC TS 61156-1-2:2023 - TC
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