ISO/IEC TR 11801-9904:2017

Information technology — Generic cabling systems for customer premises — Part 9904: Guidelines for the use of installed cabling to support 2,5GBASE -T and 5GBASE -T applications

ISO/IEC TR 11801-9904:2017(E) This technical report provides guidance on whether installed Class D and Class E channels specified in ISO/IEC 11801:2002 will support 2,5GBASE-T and 5GBASE-T. It also provides mitigation procedures to improve the perfomance of Class D and Class E channels to the point where these applications are supported. Higher classes according to ISO/IEC 11801:2002 will support 2,5GBASE-T and 5GBASE-T without mitigation up to 100 m.

Technologies de l'information — Câblage générique des locaux d'utilisateurs — Partie 9904: Titre manque

General Information

• Status: Published
• Publication Date: 25-May-2017
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Drafting Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Current Stage: 6060 - International Standard published
• Completion Date: 26-May-2017

Standards Content (Sample)

ISO/IEC TR 11801-9904
Edition 1.0 2017-05
TECHNICAL
REPORT

Information technology – Generic cabling for customer premises –
Part 9904: Assessment and mitigation of installed balanced cabling channels
to support 2,5GBASE-T and 5GBASE-T

ISO/IEC TR 11801-9904:2017-05(en)

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ISO/IEC TR 11801-9904



Edition 1.0 2017-05




TECHNICAL



REPORT



















Information technology – Generic cabling for customer premises –

Part 9904: Assessment and mitigation of installed balanced cabling channels

to support 2,5GBASE-T and 5GBASE-T


























INTERNATIONAL

ELECTROTECHNICAL

COMMISSION






ICS 35.200 ISBN 978-2-8322-3914-8



  Warning! Make sure that you obtained this publication from an authorized distributor.

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© ISO/IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 10
4 Channel transmission performance . 10
4.1 General . 10
4.2 Insertion loss . 11
4.3 Return loss . 11
4.4 NEXT . 12
4.5 PSNEXT . 13
4.6 ACR-F . 14
4.7 PSACR-F . 15
4.8 Propagation delay . 16
4.9 Propagation delay skew . 16
4.10 PSANEXT . 16
4.11 PSAACR-F . 16
4.12 Alien (exogenous) limited signal-to-noise ratio (ALSNR) . 16
5 Use cases . 23
5.1 General . 23
5.2 Assessment procedure . 23
5.3 Risk assessment tables . 24
6 Guidance for existing installations and cabling for new installations . 25
6.1 Certification, measurement and documentation . 25
6.2 Mitigation procedures for existing installations . 25
Annex A (informative) Telecommunications cabling for new installations . 26
Annex B (informative) Mitigation procedure for internal parameters . 27
Annex C (informative) Exogenous cross-talk mitigation procedures. 28
Bibliography . 29


Table 1 – Channel insertion loss . 11
Table 2 – Maximum channel insertion loss . 11
Table 3 – Channel return loss . 11
Table 4 – Minimum channel return loss . 12
Table 5 – Channel NEXT . 12
Table 6 – Minimum channel NEXT . 13
Table 7 – Channel PSNEXT . 13
Table 8 – Minimum channel PSNEXT . 14
Table 9 – Channel ACR-F . 14
Table 10 – Minimum channel ACR-F . 15
Table 11 – Channel PSACR-F . 15
Table 12 – Minimum channel PSACR-F . 16

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ISO/IEC TR 11801-9904:2017 – 3 –
© ISO/IEC 2017
Table 13 – Frequency range of insertion loss measurements . 17
Table 14 – Template PSD for disturbed channel . 18
Table 15 – PBO for 2,5GBASE-T . 18
Table 16 – PBO for 5GBASE-T . 19
Table 17 – Template PSD for disturbing channel. 20
Table 18 – PBO for 2,5GBASE-T . 21
Table 19 – PBO for 5GBASE-T . 21
Table 20 – PBO for 10GBASE-T . 21
Table 21 – Values of add_noise noise term . 22
Table 22 – Calculated permutations . 23
Table 23 – ALSNR risk matrix for Class D . 24
Table 24 – ALSNR risk matrix for Class E . 24
Table 25 – ALSNR risk matrix for Class E . 25
A

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© ISO/IEC 2017
INFORMATION TECHNOLOGY –
GENERIC CABLING FOR CUSTOMER PREMISES –

Part 9904: Assessment and mitigation of installed balanced cabling
channels to support 2,5GBASE-T and 5GBASE-T

FOREWORD
1) ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission) form
the specialized system for worldwide standardization. National bodies that are members of ISO or IEC
participate in the development of International Standards. Their preparation is entrusted to technical
committees; any ISO and IEC member body interested in the subject dealt with may participate in this
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also participate in this preparation.
2) In the field of information technology, ISO and IEC have established a joint technical committee,
ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to
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national bodies casting a vote.
3) The formal decisions or agreements of IEC and ISO on technical matters express, as nearly as possible, an
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10) Attention is drawn to the possibility that some of the elements of this Technical Report may be the subject of
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The main task of the joint technical committee is to prepare International Standards. However,
the joint technical committee may propose the publication of a Technical Report when it has
collected data of a different kind from that which is normally published as an International
Standard, for example "state of the art".
ISO/IEC TR 11801-9904, which is a Technical Report, has been prepared by
subcommittee 25: Interconnection of information technology equipment, of ISO/IEC joint
technical committee 1: Information technology.
The list of all currently available parts of the ISO/IEC 11801 series, under the general title
Information technology – Generic cabling for customer premises, can be found on the IEC
web site.
ISO/IEC TR 11801-9904 should be read in conjunction with IEEE Std. 802.3bz.

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ISO/IEC TR 11801-9904:2017 – 5 –
© ISO/IEC 2017
This document has been approved by vote of the member bodies, and the voting results may
be obtained from the address given on the second title page.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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© ISO/IEC 2017
INTRODUCTION
This document provides guidance on whether installed Class D and Class E channels
specified in ISO/IEC 11801:2002 will support 2,5GBASE-T and 5GBASE-T. This document
also provides mitigation procedures to improve the performance of Class D and Class E
channels to the point where these applications are supported. Higher classes according to
ISO/IEC 11801:2002 will support 2,5GBASE-T and 5GBASE-T without mitigation up to 100 m.
The support of 2,5GBASE-T and 5GBASE-T includes additional parameters and an extended
frequency range for Class D. Conformance of installed cabling beyond the original cabling
specifications should be determined on a case-by-case basis, and is primarily needed due to
new application requirements. Whether these requirements are met by a specific channel is
influenced by the components and installation practices used. As 2,5GBASE-T and
5GBASE-T use frequencies above those specified for Class D of ISO/IEC 11801:2002 as well
as exogenous noise parameters, input from supplier and installer might be helpful to evaluate
the performance of installed Class D and Class E channels.
This document takes into account the design goals for 2,5GBASE-T and 5GBASE-T
equipment such as frequency signal range up to 100 MHz for 2,5GBASE-T and up to 250 MHz
for 5GBASE-T.

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ISO/IEC TR 11801-9904:2017 – 7 –
© ISO/IEC 2017
INFORMATION TECHNOLOGY –
GENERIC CABLING FOR CUSTOMER PREMISES –

Part 9904: Assessment and mitigation of installed balanced cabling
channels to support 2,5GBASE-T and 5GBASE-T



1 Scope
This part of ISO/IEC 11801
a) specifies the transmission performance for balanced cabling channels to support
2,5GBASE-T and 5GBASE-T,
b) specifies the methods to assess whether installed Class D and Class E channels meet
2,5GBASE-T and 5GBASE-T requirements,
c) provides mitigation techniques to improve the performance of an existing installation to
meet the 2,5GBASE-T and 5GBASE-T requirements,
d) provides cabling recommendations for new installations.
NOTE 1 The channel transmission performance specified in this document is derived from
IEEE Std 802.3bz:2016.
NOTE 2 IEEE Std 802.3bz:2016 specifies requirements beyond the frequency range specified for Class D of
ISO/IEC 11801:2002 and additional parameters to those specified for Class D and Class E cabling in
ISO/IEC 11801:2002.
NOTE 3 This document does not re-specify Class D and Class E cabling of ISO/IEC 11801:2002.
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.
ISO/IEC 11801:2002, Information technology – Generic cabling systems
ISO/IEC 11801:2002/AMD1:2008
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 11801:2002
and 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
3.1.1
alien (exogenous) crosstalk
signal coupling from a disturbing pair of a channel to a disturbed pair of another channel

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© ISO/IEC 2017
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.2]
3.1.2
alien (exogenous) far-end crosstalk loss
AFEXT
signal isolation between a disturbing pair of a channel and a disturbed pair of another
channel, measured at the far-end
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.3]
3.1.3
alien (exogenous) near-end crosstalk loss
ANEXT
signal isolation between a disturbing pair of a channel and a disturbed pair of another
channel, measured at the near-end
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.4]
3.1.4
attenuation to alien (exogenous) crosstalk ratio at the far-end
AACR-F
difference, in dB, between the alien far-end crosstalk loss from a disturbing pair of a channel
and the insertion loss of a disturbed pair in another channel
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.7]
3.1.5
attenuation to alien (exogenous) crosstalk ratio at the near-end
AACR-N
difference, in dB, between the alien near-end crosstalk loss from a disturbing pair of a
channel and the insertion loss of a disturbed pair in another channel
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.8]
3.1.6
attenuation to crosstalk ratio at the far-end
ACR-F
difference, in dB, between the far-end crosstalk loss from a disturbing pair of a channel and
the insertion loss of a disturbed pair of the same channel
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.9]
3.1.7
attenuation to crosstalk ratio at the near-end
ACR-N
difference, in dB, between the near-end crosstalk loss from a disturbing pair of a channel and
the insertion loss of a disturbed pair of the same channel
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.10]
3.1.8
equal level far-end crosstalk ratio
ELFEXT
difference, in dB, between the far-end crosstalk loss from a disturbing pair of a channel and
the insertion loss of a disturbing pair of the same channel
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.35]

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ISO/IEC TR 11801-9904:2017 – 9 –
© ISO/IEC 2017
3.1.9
power sum alien (exogenous) far-end crosstalk loss
PSAFEXT
power sum of the signal isolation between multiple disturbing pairs of one or more channels
and a disturbed pair of another channel, measured at the far-end
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.64]
3.1.10
power sum alien (exogenous) near-end crosstalk loss
PSANEXT
power sum of the signal isolation between multiple disturbing pairs of one or more channels
and a disturbed pair of another channel, measured at the near-end
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.65]
3.1.11
power sum attenuation to alien (exogenous) crosstalk ratio at the far-end
PSAACR-F
difference, in dB, between the power sum alien far-end crosstalk loss from multiple disturbing
pairs of one or more channels and the insertion loss of a disturbed pair in another channel
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.66]
3.1.12
power sum attenuation to alien (exogenous) crosstalk ratio at the near-end
PSAACR-N
difference, in dB, between the power sum alien near-end crosstalk loss from multiple
disturbing pairs of one or more channels and the insertion loss of a disturbed pair in another
channel
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.67]
3.1.13
power sum attenuation to crosstalk ratio at the far-end
PSACR-F
difference, in dB, between the power sum far-end crosstalk loss from multiple disturbing pairs
of a channel and the insertion loss of a disturbed pair in the same channel
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.68]
3.1.14
power sum attenuation to crosstalk ratio at the near-end
PSACR-N
difference, in dB, between the power sum near-end crosstalk loss from multiple disturbing
pairs of a channel and the insertion loss of a disturbed pair in the same channel
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.69]
3.1.15
power sum equal level far-end crosstalk ratio
PSELFEXT
power sum of all disturbing pairs of a channel, of the difference, in dB, between the far-end
crosstalk loss and the insertion loss of each disturbing pair
[SOURCE: ISO/IEC 11801:2002/AMD1:2008, 3.1.70]

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© ISO/IEC 2017
3.2 Abbreviations
For the purposes of this document, the abbreviations given in ISO/IEC 11801:2002 and the
following apply.
AACR-F attenuation to exogenous crosstalk ratio at the far-end
AACR-N attenuation to exogenous crosstalk ratio at the near-end
ACR-F attenuation to crosstalk ratio at the far-end
ACR-N attenuation to crosstalk ratio at the near-end
AFEXT exogenous far-end crosstalk loss
ALSNR alien (exogenous) limited signal to noise ratio
ANEXT exogenous near-end crosstalk loss
ELFEXT equal level far-end crosstalk ratio
PBO power back off
PSAACR-F power sum attenuation to exogenous crosstalk ratio at the far-end
PSAACR-N power sum attenuation to exogenous crosstalk ratio at the near-end
PSACR-F power sum attenuation to crosstalk ratio at the far-end
PSACR-N power sum attenuation to crosstalk ratio at the near-end
PSAFEXT power sum exogenous far-end crosstalk loss
PSANEXT power sum exogenous near-end crosstalk loss
PSD power spectral density
PSELFEXT power sum equal level far-end crosstalk ratio
WAP wireless access point
4 Channel transmission performance
4.1 General
Clause 4 specifies the transmission performance of cabling channels
– ≤ 100 MHz to support 2,5GBASE-T,
– ≤ 250 MHz to support 5GBASE-T.
The channel performance described in 4.2 to 4.9 for frequencies up to 100 MHz and 250 MHz
are for re-assessment of internal parameters (IL, RL, NEXT, PSNEXT, ACR-F, PSACR-F,
Delay, Delay Skew) of Class D channels.
Class E channel internal parameters do not need any changes to support these two
applications.
Additionally, the alien limited signal-to-noise ratio (ALSNR) criterion in 4.12 has to be met by
both Class D and Class E channels.

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ISO/IEC TR 11801-9904:2017 – 11 –
© ISO/IEC 2017
4.2 Insertion loss
Insertion loss should meet or be less than the values determined using the formulas shown in
Table 1 for all specified frequencies.
NOTE For 2,5GBASE-T the formulas are applicable only to 100 MHz.
Table 1 – Channel insertion loss
Frequency Channel insertion loss
MHz dB
1 < f ≤ 250
1,05×(1,910 8 f + 0,022 2× f + 0,2 f)+ 4× 0,04× f


The channel insertion loss values in Table 2 are provided for information only.
Table 2 – Maximum channel insertion loss
Frequency Channel insertion loss
MHz dB
1,00 2,4
4,00 4,5
8,00 6,4
10,00 7,2
16,00 9,1
20,00 10,2
25,00 11,5
31,25 12,9
62,50 18,7
100,00 24,1
200,00 35,4
250,00 40,2

4.3 Return loss
The channel return loss should meet or exceed the values determined using the formulas
shown in Table 3 for all specified frequencies.
NOTE For 2,5GBASE-T the formulas are applicable only to 100 MHz.
Table 3 – Channel return loss
Frequency Return loss
MHz dB
17
1 ≤ f < 20
30 – 10log(f)
20 ≤ f ≤ 250

The channel return loss values in Table 4 are provided for information only.

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© ISO/IEC 2017
Table 4 – Minimum channel return loss
Frequency Channel return loss
MHz dB
1,00 17,0
4,00 17,0
8,00 17,0
10,00 17,0
16,00 17,0
20,00 17,0
25,00 16,0
31,25 15,1
62,50 12,1
100,00 10,0
200,00 7,0
250,00 6,0

4.4 NEXT
The channel NEXT should meet or exceed the values determined using the formulas shown in
Table 5 for all specified frequencies. Calculations that result in channel NEXT values greater
than 60 dB should revert to a requirement of 60 dB minimum.
NOTE For 2,5GBASE-T the formulas are applicable only to 100 MHz.
Table 5 – Channel NEXT
Frequency NEXT
MHz dB
 (65,3− 15log( f )) (83− 20log( f ))
 
− 20 − 20
 
− 20log 10 + 2× 10
1 ≤ f ≤ 100
 
 
 
 (65,3−15 log( f )) (83− 40 log( f ))
 
20 20
 
100 < f < 250 − 20 log 10 + 2× 10
 
 
 

The channel NEXT loss values in Table 6 are provided for information only.

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ISO/IEC TR 11801-9904:2017 – 13 –
© ISO/IEC 2017
Table 6 – Minimum channel NEXT
Frequency Channel NEXT
MHz dB
1,00 60,0
4,00 53,5
8,00 48,6
10,00 47,0
16,00 43,6
20,00 42,0
25,00 40,3
31,25 38,7
62,50 33,6
100,00 30,1
200,00 21,4
250,00 18,2

4.5 PSNEXT
The channel PSNEXT should meet or exceed the values determined using the formulas
shown in Table 7 for all specified frequencies. Calculations that result in Class D channel
PSNEXT values greater than 57 dB should revert to a requirement of 57 dB minimum.
NOTE For 2,5GBASE-T the formulas are applicable only to 100 MHz.
Table 7 – Channel PSNEXT
Frequency PSNEXT
MHz dB
(62,3−15log( f )) (80− 20log( f ))
 
 
− 20 − 20
 
− 20log 10 + 2× 10
1 ≤ f ≤ 100
 
 
 
 (62,3−15log( f )) (80− 40log( f ))
 
− 20 − 20
− 20log10 + 2× 10 
100 < f ≤ 250
 
 
 

The channel PSNEXT values in Table 8 are provided for information only.

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© ISO/IEC 2017
Table 8 – Minimum channel PSNEXT
Frequency Channel PSNEXT
MHz dB
1,00 57,0
4,00 50,5
8,00 45,6
10,00 44,0
16,00 40,6
20,00 39,0
25,00 37,3
31,25 35,7
62,50 30,6
100,00 27,1
200,00 18,4
250,00 15,2

4.6 ACR-F
The channel ACR-F should meet or exceed the values determined using the formulas shown
in Table 9 for all specified frequencies. Due to measurement considerations, channel ACR-F
values that correspond to measured channel FEXT values of greater than 70 dB are for
information only.
NOTE For 2,5GBASE-T the formulas are applicable only to 100 MHz.
Table 9 – Channel ACR-F
Frequency ACR-F
MHz dB
 (63,8− 20log( f )) (75,1− 20log( f ))
 
− 20 − 20
− 20log10 + 4× 10 
1 < f ≤ 250
 
 
 

The channel ACR-F values in Table 10 are provided for information only.

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ISO/IEC TR 11801-9904:2017 – 15 –
© ISO/IEC 2017
Table 10 – Minimum channel ACR-F
Frequency Channel ACR-F
MHz dB
1,00 57,4
4,00 45,4
8,00 39,3
10,00 37,4
16,00 33,3
20,00 31,4
25,00 29,4
31,25 27,5
62,50 21,5
100,00 17,4
200,00 11,4
250,00 9,4

4.7 PSACR-F
The channel PSACR-F should meet or exceed the values determined using the formulas
shown in Table 11 for all specified frequencies.
NOTE For 2,5GBASE-T the formulas are applicable only to 100 MHz.
Table 11 – Channel PSACR-F
Frequency Channel PSACR-F
MHz dB
 (60,8− 20log( f )) (72,1− 20log( f ))
 
− 20 − 20
 
1 < f ≤ 250 − 20log 10 + 4× 10
 
 
 

The channel PSACR-F values in Table 12 are provided for information only.

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© ISO/IEC 2017
Table 12 – Minimum channel PSAC
...