IEC 61935-1-1:2019

Specification for the testing of balanced and coaxial information technology cabling - Part 1-1: Additional requirements for the measurement of transverse conversion loss and equal level transverse conversion transfer loss

IEC 61935-1-1:2019 specifies additional reference measurement procedures for level V field testers, transverse conversion loss (TCL) and equal level transverse conversion transfer loss (ELTCTL). The requirements for field tester accuracy to measure these parameters according to the requirements of ISO/IEC 11801-1 are specified in this document.

Spécification relative aux essais des câblages symétriques et coaxiaux des technologies de l’information - Partie 1-1: Exigences supplémentaires pour le mesurage de l’affaiblissement de conversion transversale et de l’affaiblissement de transfert de conversion transversale de niveau égal

l’IEC 61935-1-1:2019 spécifie les procédures de mesure de référence supplémentaires pour les contrôleurs sur site de niveau V, l’affaiblissement de conversion transversale (TCL – transverse conversion loss) et l’affaiblissement de transfert de conversion transversale de niveau égal (ELTCTL – equal level transverse conversion transfer loss). Les exigences relatives à l’exactitude des contrôleurs sur site pour mesurer ces paramètres selon les exigences de l’ISO/IEC 11801-1 sont spécifiées dans le présent document.

General Information

• Status: Published
• Publication Date: 12-Sep-2019
• ICS: 33.120.10 - Coaxial cables. Waveguides
• Technical Committee: TC 46 - Cables, wires, waveguides, RF connectors, RF and microwave passive components and accessories
• Drafting Committee: WG 9 - TC 46/WG 9
• Current Stage: PPUB - Publication issued
• Start Date: 13-Sep-2019
• Completion Date: 13-Sep-2019

Standards Content (Sample)

IEC 61935-1-1 ®
Edition 1.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Specification for the testing of balanced and coaxial information technology
cabling –
Part 1-1: Additional requirements for the measurement of transverse conversion
loss and equal level transverse conversion transfer loss

Spécification relative aux essais des câblages symétriques et coaxiaux des
technologies de l’information –
Partie 1-1: Exigences supplémentaires pour le mesurage de l’affaiblissement de
conversion transversale et de l’affaiblissement de transfert de conversion
transversale de niveau égal
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IEC 61935-1-1 ®
Edition 1.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Specification for the testing of balanced and coaxial information technology

cabling –
Part 1-1: Additional requirements for the measurement of transverse conversion

loss and equal level transverse conversion transfer loss

Spécification relative aux essais des câblages symétriques et coaxiaux des

technologies de l’information –

Partie 1-1: Exigences supplémentaires pour le mesurage de l’affaiblissement de

conversion transversale et de l’affaiblissement de transfert de conversion

transversale de niveau égal
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.10 ISBN 978-2-8322-7282-4

– 2 – IEC 61935-1-1:2019 © IEC 2019
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms definitions and acronyms . 6
3.1 Terms and definitions . 6
3.2 Acronyms . 7
4 Reference measurement procedures . 7
4.1 Cabling configurations . 7
4.2 Transverse conversion loss . 7
4.3 Equal level transverse conversion transfer loss . 7
5 Field test measurement requirements for TCL and ELTCTL . 7
5.1 General . 7
5.2 Field test parameters . 7
5.3 Data reporting and accuracy . 7
5.3.1 General . 7
5.3.2 Detailed results . 7
5.3.3 Summary results . 8
6 Field tester measurement accuracy requirements . 8
6.1 General . 8
6.2 Comparison methods to reference procedures . 9
6.3 Accuracy performance requirements for level V field testers . 9
6.4 Procedures for determining field tester parameters . 10
6.4.1 Residual TCL of the tester (E ) . 10
RTCL
6.4.2 Residual TCTL of the tester (E ). 10
RTCTL
6.4.3 TCL random noise floor of the tester (E ) . 11
RTCL
6.4.4 TCTL random noise floor of the tester (E ) . 11
RTCTL
Annex A (informative) Error models . 12
A.1 Error model for the TCL measurement function . 12
A.2 Error model for the ELTCTL measurement function . 12

Figure 1 – Diagram of the measurement of residual TCL . 10
Figure 2 – Diagram of the measurement of residual TCTL . 11

Table 1 – Summary reporting requirements for field test equipment . 8
Table 2 – Summary of TCL and ELTCTL accuracy for level V testers . 8
Table 3 – Informative summary of TCL and ELTCTL accuracy values for level V testers . 9
Table 4 – Summary of tester requirements for TCL measurements . 9
Table 5 – Summary of tester requirements for ELTCTL measurements . 10

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SPECIFICATION FOR THE TESTING OF BALANCED
AND COAXIAL INFORMATION TECHNOLOGY CABLING –

Part 1-1: Additional requirements for the measurement of transverse
conversion loss and equal level transverse conversion transfer loss

FOREWORD
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International Standard IEC 61935-1-1 has been prepared by IEC technical committee 46:
Cables, wires, waveguides, RF connectors, RF and microwave passive components and
accessories.
The text of this International Standard is based on the following documents:
FDIS Report on voting
46/724/FDIS 46/729/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – IEC 61935-1-1:2019 © IEC 2019
A list of all parts in the IEC 61935 series, published under the general title Specification for
the testing of balanced and coaxial information technology cabling, can be found on the IEC
website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
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INTRODUCTION
Measurement of TCL and ELTCTL is not required by IEC 61935-1. However, these
parameters are specified requirements of unscreened cabling for class D up to F according
A
to ISO/IEC 11801-1. The installation can experience delivery of non-compliant components
which cannot assure ISO/IEC 11801-1 system compliance. Other installation factors can also
affect TCL and ELTCTL performance.
For screened cabling, TCL and ELTCTL are not specified requirements for class D up to F
A
according to ISO/IEC 11801-1.
Observation of the minimum requirements of IEC 61935-1 would not identify non-compliant
cabling. However, field test instrumentation can provide reference tests for TCL and ELTCTL
that can be optionally applied to the minimum requirements of IEC 61935-1.
This document describes the practice of such testing and provides a reference level of
accuracy for such field testers.
In addition, those wishing to use field test instrumentation for the laboratory evaluation of
systems or components according to ISO/IEC 11801-1 could also use this document to ensure
a consistent level of understood accuracy.

– 6 – IEC 61935-1-1:2019 © IEC 2019
SPECIFICATION FOR THE TESTING OF BALANCED
AND COAXIAL INFORMATION TECHNOLOGY CABLING –

Part 1-1: Additional requirements for the measurement of transverse
conversion loss and equal level transverse conversion transfer loss

1 Scope
This part of IEC 61935 specifies additional reference measurement procedures for level V
field testers, transverse conversion loss (TCL) and equal level transverse conversion transfer
loss (ELTCTL). The requirements for field tester accuracy to measure these parameters
according to the requirements of ISO/IEC 11801-1 are specified in this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 61935-1:2019, Specification for the testing of balanced and coaxial information
technology cabling – Part 1: Installed balanced cabling as specified in ISO/IEC 11801 and
related standards
ISO/IEC 11801-1:2017, Information technology – Generic cabling for customer premises –
Part 1: General requirements
3 Terms definitions and acronyms
For the purposes of this document, the terms and definitions given in IEC 61935-1 and
ISO/IEC 11801and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Terms and definitions
3.1.1
transverse conversion loss
ratio, expressed in dB, of the measured common mode voltage on a pair relative to the
differential mode voltage on the same pair applied at the same end
3.1.2
transverse conversion transfer loss
ratio, expressed in dB, of the measured common mode voltage on a pair relative to the
differential mode voltage applied at the opposite end of the same pair
3.1.3
equal level transverse conversion transfer loss
difference, in dB, between the transverse conversion transfer loss and the differential mode
insertion loss of a pair
3.2 Acronyms
TCL Transverse conversion loss
TCTL Transverse conversion transfer loss
ELTCTL Equal level transverse conversion transfer loss
4 Reference measurement procedures
4.1 Cabling configurations
The cabling configurations that are tested in the field are described by IEC 61935-1.
4.2 Transverse conversion loss
The reference measurement procedure for TCL is provided by IEC 61935-1.
4.3 Equal level transverse conversion transfer loss
The reference measurement procedure for ELTCTL is provided by IEC 61935-1.
5 Field test measurement requirements for TCL and ELTCTL
5.1 General
This document specifies additional reference measurement procedures for level V field test
transverse conversion loss (TCL) and equal level transverse conversions transfer loss
(ELTCTL) and the requirements for field tester accuracy to measure these parameters.
Measurement of TCL and ELTCTL is not required by IEC 61935-1; however, these parameters
are specified requirements of unscreened cabling for class D up to F according to
A
ISO/IEC 11801-1.
For screened cabling, TCL and ETCTL are not specified requirements for class D up to F
A
according to ISO/IEC 11801-1.
5.2 Field test parameters
The following field test measurement parameters and related requirements are specified in
this document:
– TCL;
– ELTCTL.
5.3 Data reporting and accuracy
5.3.1 General
See IEC 61935-1.
5.3.2 Detailed results
The field test equipment shall be capable of recording all connectivity information, as well as
the measured values of every parameter at every frequency data point. In addition, the
detailed results shall include a PASS/FAIL result for TCL and ELTCTL, as applicable for the
selected performance level.
– 8 – IEC 61935-1-1:2019 © IEC 2019
5.3.3 Summary results
A summary of the reporting requirements for field test equipment are provided by Table 1.
Table 1 – Summary reporting requirements for field test equipment
Function Measured from local end or remote end Measured from remote end (if measurement
(if measurements from both directions from remote end is required)
are not required)
Worst case TCL margin Worst case TCL margin
(1 of 4 possible) (1 of 4 possible)
Test limit at worst case TCL margin Test limit at worst case TCL margin
TCL
TCL at worst case TCL margin TCL at worst case TCL margin
Frequency at which worst case margin occurs Frequency at which worst case margin occurs
PASS/FAIL PASS/FAIL
Worst case ELTCTL margin Worst case ELTCTL margin
(1 of 4 possible) (1 of 4 possible)
Test limit at worst case ELTCTL margin Test limit at worst case ELTCTL margin
ELTCTL
ELTCTL at worst case ELTCTL margin ELTCTL at worst case ELTCTL margin
Frequency at which worst case margin occurs Frequency at which worst case margin occurs
PASS/FAIL PASS/FAIL
6 Field tester measurement accuracy requirements
6.1 General
A summary of the accuracy of TCL and ELTCTL measurements for level V testers is provided
by Table 2.
Table 2 – Summary of TCL and ELTCTL accuracy for level V testers
Test Baseline accuracy at Link accuracy at permanent Channel accuracy at channel
parameter permanent link limit link limit limit
Level V dB dB dB
1≤f< 1≤f< 1≤f< 100≤f≤
50≤f<100 100≤f≤ 50≤f< 100≤f≤ 50≤f<
Frequency 50 50 50 1 000
MHz 1 000 MHz 100 MHz 1 000 MHz 100 MHz
MHz MHz MHz MHz
f
f f
7,0−
7,0− 7,0−
TCL 5,0 3,0 5,0 3,0 5,0 3,0
25 25
f
f f 5,0−
ELTCTL 4,0 5,0− 3,0 4,0 5,0− 3,0 4,0 3,0
50 50
Table 3 provides an informative summary of TCL and ELTCTL accuracy values for level V
testers.
Table 3 – Informative summary of TCL and ELTCTL accuracy values for level V testers
TCL ELTCTL
Baseline Link Channel Baseline Link Channel
Frequency
accuracy at accuracy at accuracy at accuracy at accuracy at accuracy at
permanent permanent channel permanent permanent channel
link limit link limit limit link limit link limit limit
MHz dB dB dB dB dB dB
1 5,0 5,0 5,0 4,0 4,0 4,0
50 5,0 5,0 5,0 4,0 4,0 4,0
100 3,0 3,0 3,0 3,0 3,0 3,0
1 000 3,0 3,0 3,0 3,0 3,0 3,0
NOTE For Class D up to F , ISO/IEC 11801-1 limits for TCL are specified to a maximum frequency of 250 MHz,
A
and ELTCTL to a maximum frequency of 30 MHz. IEC 61935-1 (all parts) documents specify accuracy as
referenced at the limit line, and for the purposes of IEC 61935-1-1 accuracy requirements, extrapolations (or
highest frequency requirement) of ISO/IEC 11801-1 TCL and ELTCTL requirements have been assumed to apply
up to 1 000 MHz with a plateau of 3 dB applied.
6.2 Comparison methods to reference procedures
When comparing TCL and ELTCTL results to reference measurement procedures provided by
IEC 61935-1, the full frequency comparison method given by IEC 61935-1:2019 6.12.2.2.
shall be used. Annex A provides informative error models for TCL and ELTCTL.
6.3 Accuracy performance requirements for level V field testers
The tester performance requirements for TCL measurements for level V testers are provided
by Table 4.
Table 4 – Summary of tester requirements for TCL measurements
Parameter Baseline field tester Field tester with level V Field tester with level
permanent link adapter V channel adapter

dB
dB dB
Dynamic accuracy for
TCL
±0,75 ±0,75 ±0,75
)
(E
TCL
1 MHz to 300 MHz: 1 MHz to 300 MHz: 1 MHz to 300 MHz:
20 – 12,5 log(f /100) 18 – 12,5 log(f /100) 18 – 12,5 log(f /100)
Differential mode
20 max 20 max 20 max
return loss of the
300 MHz to 600 MHz: 300 MHz to 600 MHz: 300 MHz to 600 MHz:
tester
14 12 12
(E )
DMRL,tester
600 MHz to 1 000 MHz: 600 MHz to 1 000 MHz: 600 MHz to 1 000 MHz:
21 – 9 log(f /100) 19 – 9 log(f /100) 19 – 9 log(f /100)
10 – 10 log(f /100)
Common mode return
loss of the tester
6 6 6 max
(E )
CMRL,tester
3 min
Residual TCL of the
55 – 20 log(f /100) 55 – 20 log(f /100) 45 – 20 log(f /100)
tester
55 max 55 max 55 max
(E )
RTCL
TCL random noise
floor of the tester
85 80 80
(E )
RTCL
– 10 – IEC 61935-1-1:2019 © IEC 2019
The tester performance requirements for ELTCTL measurements for level V testers are
provided by Table 5.
Table 5 – Summary of tester requirements for ELTCTL measurements
Parameter Baseline field tester Field tester with level V Field tester with level
permanent link adapter V channel adapter

dB
dB dB
Dynamic accuracy for
± 0,75 ± 0,75 ± 0,75
TCTL
Dynamic accuracy for
± 0,75 ± 0,75 ± 0,75
IL
1 MHz to 300 MHz:
1 MHz to 300 MHz: 1 MHz to 300 MHz:
18 – 12,5 log(f /100)
20 – 12,5 log(f /100) 18 – 12,5 log(f /100)
20 max
20 max 20 max
Differential mode
300 MHz to 600 MHz:
return loss of the 300 MHz to 600 MHz: 300 MHz to 600 MHz:
tester
14 12
600 MHz to 1 000
600 MHz to 1 000 MHz: 600 MHz to 1 000 MHz:
MHz:
21 – 9 log(f /100) 19 – 9 log(f /100)
19 – 9 log(f /100)
10 – 10 log(f /100)
Common mode return
6 6 6 max
loss of the tester
3 min
Residual TCTL of the 42 – 20 log( f /100) 42 – 20 log(f /100) 30 – 20 log(f /100)
tester
50 max 50 max 45 max
TCTL random noise
85 80 80
floor of the tester
Dynamic accuracy for
±0,75 ± 0,75 ± 0,75
TCTL
6.4 Procedures for determining field tester parameters
6.4.1 Residual TCL of the tester (E )
RTCL
The measurement of residual TCL shall be according the measurement setup shown
in Figure 1.
Field tester
Z
d1
50 Ω
Source
Z
c
Z
port
d2 50 Ω
25 Ω
Z and Z matched to ±0,01 %
d1 d2
IEC
Figure 1 – Diagram of the measurement of residual TCL
6.4.2 Residual TCTL of the tester (E )
RTCTL
The measurement of residual TCTL shall be according to Figure 2.

Local Remote
unit unit
IEC
Figure 2 – Diagram of the measurement of residual TCTL
The measurement provides a residual TCTL contribution from both local and remote test units,
and shall be corrected according to Equation (1).
E TCTL+ 6 (1)
RTCL meas
where
E is the residual TCTL of the tester in dB;
RTCL
TCTL is the measured TCTL of both local and remote testers in dB.
meas
6.4.3 TCL random noise floor of the tester (E )
RTCL
The TCL random noise floor of the tester shall be measured according to the setup shown in
Figure 1, with the source port of the tester disabled.
)
6.4.4 TCTL random noise floor of the tester (E
RTCTL
The TCTL random noise floor of the tester shall be measured according to the setup shown in
Figure 2, with the source port of the tester disabled.

=
– 12 – IEC 61935-1-1:2019 © IEC 2019
Annex A
(informative)
Error models
A.1 Error model for the TCL measurement function
The error model for the TCL measurement function is given by Equation (A.1).
−+(EE ) −+(EE ) −(E + E )
DMRL,,tester CMRL tester DMRL,tester DMRL,link CMRL,,tester CMRL link
 
20 20 20
 
1+10 +10 +10
 
Accy E+ 20log (A.1)
TCL d ,TCL
 AE− AE− 
( ) ( )
TCL RTCL TCL TCLNF 2
 
 10 10 
++10 10 
 
 
 
 
where
Accy is the estimated accuracy of the TCL measurement function in dB;
TCL
is the TCL signal amplitude for accuracy in dB;
A
TCL
E is the dynamic accuracy of the tester for TCL in dB;
d ,TCL
is the differential mode return loss of the tester in dB;
E
DMRL,tester
is the common mode return loss of the tester in dB;
E
CMRL,tester
is the differential mode return loss of the link in dB;
E
DMRL,link
is the common mode return loss of the link in dB;
E
CMRL,link
E is the residual TCL of the tester in dB;
RTCL
E is the TCL random noise floor of the tester in dB.
TCLNF
A.2 Error model for the ELTCTL measurement function
The error model for the ELTCTL measurement function is given by Equation (A.4).


−E
DMRL,tester

1+10

Accy E+⋅20 log
(A.2)
IL d ,IL 2
− EE+
( )
DMRL,,tester DMRL link

20

1−10



− EE+
( DMRL,tester CMRL,tester)
 
 
1+10
 
−(E +E ) −+(E E )
DMRL,tester DMRL,link CMRL,tester CMRL,link
  
 
20 20
  
1−10 ⋅ 1−10
Accy E +⋅20 log
(A.3)
 
TCTL d ,TCTL
  
 
  
 
( A + A +E ) ( A ++6 E )
ELTCTL IL NFTCTL ELTCTL RTCTL
 
10 10
+ 10 +10
 
Accy Accy+ Accy (A.4)
ELTCTL IL TCTL
=
=
=
=
IEC 61935-1-1:20
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