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eLibrary > PD IEC TS 61156-1-2:2023 Multicore and symmetrical pair/quad cables for digital communications - Electrical transmission characteristics and test methods of symmetrical pair/quad cables >

PD IEC TS 61156-1-2:2023 Multicore and symmetrical pair/quad cables for digital communications - Electrical transmission characteristics and test methods of symmetrical pair/quad cables, 2023

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PD IEC TS 61156-1-2:2023 Multicore and symmetrical pair/quad cables for digital communications - Electrical transmission characteristics and test methods of symmetrical pair/quad cables, 2023

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CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms, definitions, symbols, units and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Symbols, units and abbreviated terms
4 Basic transmission line formulae [Go to Page]
4.1 Overview
4.2 Complex characteristic impedance and propagation coefficient formulae [Go to Page]
4.2.1 General
4.2.2 Propagation coefficient
4.2.3 Complex characteristic impedance
4.2.4 Phase and group velocity
4.3 High frequency representation of secondary parameters
4.4 Frequency dependence of the primary and secondary parameters [Go to Page]
4.4.1 Resistance
4.4.2 Inductance
4.4.3 Complex characteristic impedance
4.4.4 Attenuation coefficient
4.4.5 Phase delay and group delay
5 Measurement of the complex characteristic impedance [Go to Page]
5.1 General
Figures [Go to Page]
Figure 1 – Secondary parameters extending from 1 kHz to 1 GHz
5.2 Open/short circuit single-ended impedance measurement made with a balun (reference method) [Go to Page]
5.2.1 Principle
5.2.2 Test equipment
5.2.3 Procedure
Figure 2 – Diagram of cable pair measurement circuit [Go to Page]
5.2.4 Expression of results
5.3 Function fitting the impedance magnitude and angle [Go to Page]
5.3.1 General
5.3.2 Impedance magnitude
5.3.3 Function fitting the angle of the complex characteristic impedance
5.4 Complex characteristic impedance determined from measured phase coefficient and capacitance [Go to Page]
5.4.1 General
5.4.2 Formulae for all frequencies case and for high frequencies
5.4.3 Procedure for the measurement of the phase coefficient
5.4.4 Phase delay
Figure 3 – Determining the multiplier of 2πradians to add to the phase measurement [Go to Page]
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
5.6 Extended open/short circuit method using a balun but excluding the balun performance [Go to Page]
5.6.1 Test equipment and cableend preparation
5.6.2 Basic formulae
5.6.3 Measurement principle
Figure 4 – Measurement configurations
Figure 5 – Measurement principle with four terminal network theory
5.7 Extended open/short circuit method without using a balun [Go to Page]
5.7.1 Basic formulae and circuit diagrams
5.7.2 Measurement principle
Figure 6 – Admittance measurement configurations
Figure 7 – Admittance measurement principle
5.8 Open/short impedance measurements at low frequencies with a balun
5.9 Complex characteristic impedance and propagation coefficient obtained from modal decomposition technique [Go to Page]
5.9.1 General
5.9.2 Procedure
5.9.3 Measurement principle
Figure 8 – Transmission line system [Go to Page]
5.9.4 Scattering matrix to impedance matrix
5.9.5 Expression of results
6 Measurement of return loss and structural return loss [Go to Page]
6.1 General
6.2 Principle
7 Propagation coefficient effects due to periodic structural variation related to the effects appearing in the structural return loss [Go to Page]
7.1 General
7.2 Formula for the forward echoes caused by periodic structural inhomogeneities
8 Unbalance attenuation [Go to Page]
8.1 General
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
Tables [Go to Page]
Table 1 – Unbalance attenuation at near end
Table 2 – Unbalance attenuation at far end
Table 3 – Measurement set-up
8.3 Theoretical background
Figure 11 – Circuit of an infinitesimal element of a symmetric pair
9 Balunless test method [Go to Page]
9.1 Overall test arrangement [Go to Page]
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 [Go to Page]
9.1.2 Measurement precautions
9.1.3 Mixed mode S-parameter nomenclature
Figure 14 – Diagram of a single-ended 4-port device
Figure 15 – Diagram of a balanced 2-port device [Go to Page]
9.1.4 Coaxial cables and interconnect for network analysers
9.1.5 Reference loads for calibration
Table 4 – Mixed mode S-parameter nomenclature [Go to Page]
9.1.6 Calibration
Figure 16 – Solution for calibration of reference loads [Go to Page]
9.1.7 Termination loads for termination of conductor pairs
Figure 17 – Resistor termination networks [Go to Page]
9.1.8 Termination of screens
9.1.9 Calibration
9.1.10 Establishment of noise floor
9.2 Cabling and cable measurements [Go to Page]
9.2.1 Insertion loss and EL TCTL
Table 5 – Requirements for terminations at calibration plane [Go to Page]
9.2.2 NEXT
Figure 18 – Insertion loss and EL TCTL
Figure 19 – NEXT [Go to Page]
9.2.3 ACR-F
Figure 20 – FEXT [Go to Page]
9.2.4 Return loss and TCL
9.2.5 PS alien near-end crosstalk (PS ANEXT-Exogenous crosstalk)
Figure 21 – Return loss and TCL
Figure 22 – Alien NEXT [Go to Page]
9.2.6 PS attenuation to alien crosstalk ratio, far-end crosstalk (PS AACR-F- Exogenous crosstalk
Figure 23 – Alien FEXT
Annex A (informative)Example derivation of mixed mode parametersusing the modal decomposition technique [Go to Page]
Figure A.1 – Voltage and current on balanced DUT
Figure A.2 – Voltage and current on unbalanced DUT
Bibliography [Go to Page]

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PD IEC TS 61156-1-2:2023 Multicore and symmetrical pair/quad cables for digital communications - Electrical transmission characteristics and test methods of symmetrical pair/quad cables, 2023

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