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BSI PD IEC TS 61156-1-2:2023

BSI PD IEC TS 61156-1-2:2023

$215.11

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 2023 78
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PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
7 FOREWORD
9 1 Scope
2 Normative references
3 Terms, definitions, symbols, units and abbreviated terms
3.1 Terms and definitions
10 3.2 Symbols, units and abbreviated terms
12 4 Basic transmission line formulae
4.1 Overview
13 4.2 Complex characteristic impedance and propagation coefficient formulae
4.2.1 General
4.2.2 Propagation coefficient
14 4.2.3 Complex characteristic impedance
16 4.2.4 Phase and group velocity
17 4.3 High frequency representation of secondary parameters
19 4.4 Frequency dependence of the primary and secondary parameters
4.4.1 Resistance
4.4.2 Inductance
4.4.3 Complex characteristic impedance
20 4.4.4 Attenuation coefficient
4.4.5 Phase delay and group delay
21 5 Measurement of the complex characteristic impedance
5.1 General
Figures
Figure 1 – Secondary parameters extending from 1 kHz to 1 GHz
22 5.2 Open/short circuit single-ended impedance measurement made with a balun (reference method)
5.2.1 Principle
23 5.2.2 Test equipment
5.2.3 Procedure
Figure 2 – Diagram of cable pair measurement circuit
24 5.2.4 Expression of results
5.3 Function fitting the impedance magnitude and angle
5.3.1 General
5.3.2 Impedance magnitude
26 5.3.3 Function fitting the angle of the complex characteristic impedance
27 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
28 5.4.3 Procedure for the measurement of the phase coefficient
29 5.4.4 Phase delay
Figure 3 – Determining the multiplier of 2πradians to add to the phase measurement
30 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
31 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
32 Figure 4 – Measurement configurations
Figure 5 – Measurement principle with four terminal network theory
34 5.7 Extended open/short circuit method without using a balun
5.7.1 Basic formulae and circuit diagrams
36 5.7.2 Measurement principle
Figure 6 – Admittance measurement configurations
Figure 7 – Admittance measurement principle
37 5.8 Open/short impedance measurements at low frequencies with a balun
39 5.9 Complex characteristic impedance and propagation coefficient obtained from modal decomposition technique
5.9.1 General
5.9.2 Procedure
40 5.9.3 Measurement principle
Figure 8 – Transmission line system
42 5.9.4 Scattering matrix to impedance matrix
44 5.9.5 Expression of results
6 Measurement of return loss and structural return loss
6.1 General
6.2 Principle
45 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
47 8 Unbalance attenuation
8.1 General
48 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
49 Tables
Table 1 – Unbalance attenuation at near end
Table 2 – Unbalance attenuation at far end
Table 3 – Measurement set-up
50 8.3 Theoretical background
Figure 11 – Circuit of an infinitesimal element of a symmetric pair
53 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
54 9.1.2 Measurement precautions
9.1.3 Mixed mode S-parameter nomenclature
55 Figure 14 – Diagram of a single-ended 4-port device
Figure 15 – Diagram of a balanced 2-port device
56 9.1.4 Coaxial cables and interconnect for network analysers
9.1.5 Reference loads for calibration
Table 4 – Mixed mode S-parameter nomenclature
57 9.1.6 Calibration
Figure 16 – Solution for calibration of reference loads
58 9.1.7 Termination loads for termination of conductor pairs
Figure 17 – Resistor termination networks
59 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
61 9.2.2 NEXT
Figure 18 – Insertion loss and EL TCTL
62 Figure 19 – NEXT
63 9.2.3 ACR-F
64 Figure 20 – FEXT
65 9.2.4 Return loss and TCL
66 9.2.5 PS alien near-end crosstalk (PS ANEXT-Exogenous crosstalk)
Figure 21 – Return loss and TCL
68 Figure 22 – Alien NEXT
69 9.2.6 PS attenuation to alien crosstalk ratio, far-end crosstalk (PS AACR-F- Exogenous crosstalk
70 Figure 23 – Alien FEXT
72 Annex A (informative)Example derivation of mixed mode parametersusing the modal decomposition technique
Figure A.1 – Voltage and current on balanced DUT
74 Figure A.2 – Voltage and current on unbalanced DUT
76 Bibliography

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BSI PD IEC TS 61156-1-2:2023
$215.11