SIST EN 50289-1-9:2017

SLOVENSKI STANDARD
01-maj-2017
1DGRPHãþD
SIST EN 50289-1-9:2002
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Communication cables - Specifications for test methods - Part 1-9: Electrical test
methods - Unbalance attenuation (transverse conversion loss TCL transverse conversion
transfer loss TCTL)
Kommunikationskabel - Spezifikationen für Prüfverfahren Teil 1-9: Elektrische
Prüfverfahren - Unsymmetriedämpfung (Unsymmetriedämpfung am nahen und am
fernen Ende)
Câbles de communication - Spécifications des méthodes d'essai Partie 1-9: Méthodes
d'essais électriques - Affaiblissement de disymétrie (perte de conversion longitudinale,
perte de transfert de conversion longitudinale)
Ta slovenski standard je istoveten z: EN 50289-1-9:2017
ICS:
33.120.20 äLFHLQVLPHWULþQLNDEOL Wires and symmetrical
cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50289-1-9
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2017
ICS 33.120.20 Supersedes EN 50289-1-9:2001
English Version
Communication cables - Specifications for test methods -
Part 1-9: Electrical test methods - Unbalance attenuation
(transverse conversion loss TCL transverse conversion transfer
loss TCTL)
Câbles de communication - Spécifications des méthodes Kommunikationskabel - Spezifikationen für Prüfverfahren
d'essai Partie 1-9: Méthodes d'essais électriques - Teil 1-9: Elektrische Prüfverfahren - Unsymmetriedämpfung
Affaiblissement de disymétrie (perte de conversion (Unsymmetriedämpfung am nahen und am fernen Ende)
longitudinale, perte de transfert de conversion
longitudinale)
This European Standard was approved by CENELEC on 2016-12-16. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any
alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50289-1-9:2017 E
Contents Page
European foreword . 3
1 Scope. 4
2 Normative references . 4
3 Terms and definitions . 4
4 Test method . 5
4.1 Method A: measurement using balun setup . 5
4.1.1 Test equipment . 5
4.1.2 Test sample . 5
4.1.3 Calibration procedure . 6
4.1.4 Measuring procedure . 8
4.1.5 Expression of test results . 10
4.2 Method B: measurement using balun-less setup . 11
4.2.1 Test equipment . 11
4.2.2 Test sample . 11
4.2.3 Calibration procedure . 12
4.2.4 Measuring procedure . 12
4.2.5 Expression of test results . 13
5 Test report . 14
Annex A (informative) General background of unbalance attenuation . 15
A.1 General . 15
A.2 Unbalance attenuation near end and far end . 16
A.3 Theoretical background . 17
Bibliography . 21

European foreword
This document [EN 50289-1-9:2017] has been prepared by CLC/TC 46X “Communication cables”.
The following dates are fixed:
• latest date by which this document has to be implemented (dop) 2017-09-16
at national level by publication of an identical national
standard or by endorsement
• latest date by which the national standards conflicting with (dow) 2019-12-16
this document have to be withdrawn
This document supersedes EN 50289-1-9:2001.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
EN 50289-1, Communication cables — Specifications for test methods, is currently composed with the
following parts:
— Part 1-1: Electrical test methods — General requirements;
— Part 1-2: Electrical test methods — DC resistance;
— Part 1-3: Electrical test methods — Dielectric strength;
— Part 1-4: Electrical test methods — Insulation resistance;
— Part 1-5: Electrical test methods — Capacitance;
— Part 1-6: Electrical test methods — Electromagnetic performance;
— Part 1-7: Electrical test methods — Velocity of propagation;
— Part 1-8: Electrical test methods — Attenuation;
— Part 1-9: Electrical test methods — Unbalance attenuation (transverse conversion loss TCL transverse
conversion transfer loss TCTL);
— Part 1-10: Electrical test methods — Crosstalk;
— Part 1-11: Electrical test methods — Characteristic impedance, input impedance, return loss;
— Part 1-12: Electrical test methods — Inductance;
— Part 1-13: Electrical test methods — Coupling attenuation or screening attenuation of patch cords /
coaxial cable assemblies / pre-connectorised cables;
— Part 1-14: Electrical test methods — Coupling attenuation or screening attenuation of connecting
hardware;
— Part 1-15: Electromagnetic performance — Coupling attenuation of links and channels (Laboratory
conditions);
— Part 1-16: Electromagnetic performance — Coupling attenuation of cable assemblies (Field conditions);
— Part 1-17: Electrical test methods — Exogenous Crosstalk ExNEXT and ExFEXT.
1 Scope
This European Standard details the test methods to determine the attenuation of converted differential-mode
signals into common-mode signals, and vice versa, due to balance characteristics of cables used in analogue
and digital communication systems by using the transmission measurement method. The unbalance
attenuation is measured in, respectively converted to, standard operational conditions. If not otherwise
specified, e.g. by product specifications, the standard operational conditions are a differential-mode which is
matched with its nominal characteristic impedance (e.g. 100 Ω) and a common-mode which is loaded with
50 Ω. The difference between the (image) unbalance attenuation (matched conditions in the differential and
common-mode) to the operational (Betriebs) unbalance attenuation (matched conditions in differential-mode
and 50 Ω reference load in the common-mode) is small provided the common-mode impedance Z is in
com
the range of 25 Ω to 75 Ω.
For cables having a nominal impedance of 100 Ω, the value of the common-mode impedance Z is about
com
75 Ω for up to 25 pair- count unscreened pair cables, 50 Ω for common screened pair cables and more than
25 pair- count unscreened pair cables, and 25 Ω for individually screened pair cables. The impedance of the
common-mode circuit Z can be measured more precisely either with a time domain reflectometer (TDR)
com
or a network analyser. The two conductors of the pair are connected together at both ends and the
impedance is measured between these conductors and the return path.
This European Standard is bound to be read in conjunction with EN 50289-1-1, which contains essential
provisions for its application.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 50289-1-1:2017, Communication cables — Specifications for test methods — Part 1-1: Electrical test
methods — General requirements
EN 50289-1-8, Communication cables - Specifications for test methods - Part 1-8: Electrical test methods -
Attenuation
EN 50290-1-2, Communication cables - Part 1-2: Definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50290-1-2 and the following apply.
3.1
unbalance attenuation
logarithmic ratio of the differential-mode power (transmission signal of a balanced pair) to the common-mode
power (signal in the pair to ground/earth unbalanced circuit) measured at the near and at the far end
Note 1 to entry: The (operational) unbalance attenuation is described by the logarithmic ratio of the differential-mode
power to the common-mode power in standard operational conditions. If not otherwise specified, e.g. by product
specifications, the standard operational conditions are a differential-mode which is matched with its nominal
characteristic impedance (e.g. 100 Ω) and a common-mode which is loaded with 50 Ω.
 
PZU
diff diff com
 
a= 10×lg = 20×lg +×10 lg (1)
u
 
PZU
com com  diff 
where
Pdiff is the power in the differential-mode (balanced) circuit;
Pcom is the power in the common-mode (unbalanced) circuit;
U is the voltage in the differential-mode (balanced) circuit;
diff
Ucom is the voltage in the common-mode (unbalanced) circuit;
Z is the characteristic impedance of the differential-mode (balanced) circuit;
diff
Zcom is the characteristic impedance of the common-mode (unbalanced) circuit.
3.2
transverse conversion loss
TCL
logarithmic ratio of the differential-mode injected signal at the near end to the resultant common-mode signal
at the near end of a balanced pair, and which is equal to unbalance attenuation at near end when the CUT is
terminated with the same impedances as defined for unbalance attenuation measurement
Note 1 to entry: This definition stems from ITU-G.117.
3.3
transverse conversion transfer loss
TCTL
logarithmic ratio of the differential-mode injected signal at the near end to the resultant common-mode signal
at the far end of a balanced pair, and which is equal to unbalance attenuation at far end when the CUT is
terminated with the same impedances as defined for unbalance attenuation measurement
Note 1 to entry: This definition stems from ITU-G.117.
4 Test method
4.1 Method A: measurement using balun setup
4.1.1 Test equipment
a) It is mandatory to create a defined return (common-mode) path. This is achieved by grounding all other
pairs and screen(s) if present in common to the balun ground. However in addition in the case of
unscreened cables the cable under test shall be wound onto a grounded metal drum. The drum surface
may have a suitable groove, wide enough to contain the cable, and shall be adequate to hold 100 m of
cable in one layer. The pair under test shall be terminated with differential-mode and common-mode
terminations and grounded at near and far ends
b) A network analyser or generator/receiver combination suitable for the required frequency and dynamic
range.
c) The baluns shall have a common-mode port and the characteristics given in EN 50289-1-1:2017,
Table 1.
d) Time domain reflectometer (optional).
4.1.2 Test sample
The ends of the cable under test (CUT) shall be prepared so that the twisting of the pairs/quads is maintained
up to the terminals of the test equipment. If not otherwise specified the CUT shall have a length of
100 m ± 1 m. For the measurement or evaluation of the equal level unbalance attenuation at the far end the
following applies: if the CUT length is not otherwise specified and the attenuation of the CUT at the highest
frequency to be measured is higher than or equal to 80 dB the length of the CUT may be reduced to limit the
attenuation to maximum 80 dB.
All pairs not under test and all screens shall be connected in common to the same ground as the balun at
both ends of the CUT.
For unscreened cables the CUT shall be wound tightly around the metal drum in one layer. The distance
between the windings should be at least the diameter of the cable. The metal drum shall be connected to the
same ground as the balun, e.g. by fixing the baluns to the drum.
4.1.3 Calibration procedure
a) The reference line calibration (0 dB-line) shall be determined by connecting coaxial cables between the
analyser input and output. The same coaxial cables shall also be used for the balun loss and unbalance
attenuation measurements. The calibration shall be established over the whole frequency range
specified in the relevant cable specification. This calibration method is valid for closely matched baluns
that satisfy the characteristics of Table 1.
b) Figure 1 gives the schematic for the measurement of the differential-mode loss of the baluns. Two baluns
are connected back to back on the symmetrical output side and their attenuation measured over the
specified frequency range. The connection between the two baluns shall be made with negligible loss.

Key
U
voltage at network analyser port or signal generator
U
voltage at network analyser port or receiver
U
voltage at symmetrical port of baluns
diff
Figure 1 — Test set-up for the measurement of the differential-mode loss of the baluns
The differential-mode loss of the baluns is given by:

U

α =0,5× 20×lg =−×0,5 20×lg S (2)
( )
diff 21

U

where
α is the differential-mode loss of the balun (dB);
diff
S is the scattering parameter S (forward transmission coefficient) where port 1 is the primary
21 21
(unbalanced side) side of the near end balun and port 2 is the primary side (unbalanced
port) of the far end balun.
c) Figure 2 gives the schematic for the measurement of the common-mode loss of the baluns. The baluns
used in b) are connected together; the unbalanced balun ports are terminated with the nominal test
equipment impedance, the test equipment is connected to the common-mode ports (centre taps) of the
baluns.
Key
U
voltage at network analyser port or signal generator
U
voltage at network analyser port or receiver
Figure 2 — Test set-up for the measurement of the common-mode loss of the baluns
The common-mode loss of the baluns is given by:
 
U
 
α =0,5× 20×lg =−×0,5 20×lg S (3)
( )
com 21
 
U
 
where
α is the common-mode loss of the balun (dB);
com
S is the scattering parameter S (forward transmission coefficient) where port 1 is the common-
21 21
mode port of the near end balun and port 2 is the common-mode port of the far end balun.
d) The operational attenuation of the balun α takes into account the common-mode and differential-
balun
mode losses of the balun:
α αα+ (4)
balun diff com
where
α is the operational attenuation or intrinsic loss of the balun (dB).
balun
NOTE More precise results can be obtained using either poling of the baluns for α and α and averaging the
diff com
results or using three baluns. In the latter case, the assumption of identical baluns is not required.
=
e) The voltage ratio of the balun can be expressed by the turns ratio of the balun and the operational
attenuation of the balun:
U Z
diff diff
20×lg =10×−lg α
balun
U Z
(5)
U Z
diff diff
20×lg =10×−lg α
balun
U Z
where
Udiff is the differential-mode voltage at the input of the cable under test (V);
U is the voltage at the network analyser port or signal generator (V);
Zdiff is the characteristic impedance of the differential-mode circuit (Ω);
Z is the output impedance of the network analyser or signal generator (Ω);
U1 is the voltage at the input of the load (V);
Z is the input impedance of the load (Ω).
4.1.4 Measuring procedure
All pairs/quads of the cable shall be measured at both ends of the CUT. The unbalance attenuation shall be
measured over the whole-specified frequency range and at the same frequency points as for the calibration
procedure.
The measurement is done under standard operational conditions, i.e. one is measuring the Betriebs-
(operational) unbalance attenuation. If not otherwise specified, e.g. by product specifications, the standard
operational conditions are a differential-mode which is matched with its nominal characteristic impedance
(e.g. 100 Ω) and a common-mode which is loaded with 50 Ω.
Figure 3 gives a schematic of the measurement for unbalance attenuation at the near end.

Figure 3 — Test set-up for unbalance attenuation at near end (TCL)
U
α =20×lg =−×20 lg S (6)
meas 21
U
n, com
where
α is the measured attenuation (dB);
meas
S is the scattering parameter S (forward transmission coefficient) where port 1 is the primary
21 21
(unbalanced) side of the near end balun and port 2 is the common-mode port of the near
end balun
U voltage in the primary (unbalanced) circuit at the near end balun
U voltage in the common-mode circuit (V) at the near end balun
n,com
Figure 4 gives a schematic of the measurement for unbalance attenuation at far end.

Figure 4 — Test set-up for unbalance attenuation at far end (TCTL)
U
α =20×lg =−×20 lg S (7)
meas 21
U
f , com
where
α is the measured attenuation (dB);
meas
S is the scattering parameter S (forward transmission coefficient) where port 1 is the primary
21 21
(unbalanced) side of the near end balun and port 2 is the common-mode port of the far
end balun;
U voltage in the primary (unbalanced) circuit at the near end balun;
U voltage in the common-mode circuit (V) at the far end balun.
n,com
4.1.5 Expression of test results
The unbalance attenuation is defined as the logarithmic ratio of the differential-mode power to the common-
mode power:
P
UZ
diff
diff com
α = 20×lg = 20×lg +×10 lg (8)
u,n
UZ
P
u,f
diff
n,com
n,com
f,com
f,com
where
α is the unbalance attenuation (dB) at the near end (subscript n) respectively far end (subscript
u
f);
P is the common-mode power (W) at the near end (subscript n) respectively far end (subscript
com
f);
P is the differential-mode power (W);
diff
Z is the nominal characteristic impedance of the differential-mode of the CUT;
diff
Z is the standardized operational impedance of the common-mode, 50 Ω.
com
When measuring with S-parameter test-sets, the output voltage of the generator is measured instead of the
differential-mode voltage in the cable under test. Taking the operational attenuation of the balun into account,
the formula for the unba
...