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ISO/IEC TR 11801-9909
Edition 1.0 2020-06
TECHNICAL
REPORT
colour
inside
Information technology – Generic cabling for customer premises –
Part 9909: Evaluation of balanced cabling in support of 25 Gbit/s for reach
greater than 30 metres
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ISO/IEC TR 11801-9909
Edition 1.0 2020-06
TECHNICAL
REPORT
colour
inside
Information technology – Generic cabling for customer premises –
Part 9909: Evaluation of balanced cabling in support of 25 Gbit/s for reach
greater than 30 metres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.200 ISBN 978-2-8322-8487-2
– 2 – ISO/IEC TR 11801-9909:2020
© ISO/IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 7
4 Extended reach channel specifications . 8
4.1 General . 8
4.2 Channel performance enhancement methods for increased SNR . 8
4.2.1 General . 8
4.2.2 Reduced delay and delay skew . 9
4.2.3 Enhanced cable . 9
4.2.4 Enhanced connector . 9
4.3 Example channel specifications with length scaling . 9
4.3.1 General . 9
4.3.2 Return loss (RL) . 10
4.3.3 Insertion loss (IL) . 10
4.3.4 Near-end crosstalk loss (NEXT) . 11
4.3.5 Attenuation to crosstalk loss ratio near-end (ACR-N) . 11
4.3.6 Attenuation to crosstalk ratio far-end (ACR-F) . 12
4.3.7 Alien (exogenous) crosstalk . 12
4.3.8 DC loop resistance . 13
4.3.9 Propagation delay . 13
4.3.10 Delay skew . 13
4.3.11 Unbalance attenuation near end (TCL) and far end (ELTCTL), and
coupling attenuation . 14
Annex A (informative) Reduced delay and delay skew . 15
A.1 Reduced delay relation to extended reach . 15
A.1.1 General . 15
A.1.2 Example reduced delay evaluation. 15
A.2 Delay relation to insertion loss (IL) . 15
A.2.1 General . 15
A.2.2 Relation of variable relative permittivity to attenuation . 16
A.2.3 Relation of dissipation factor to attenuation: . 16
Annex B (informative) Enhanced capacity . 18
B.1 Enhanced cabling components . 18
B.1.1 General . 18
B.1.2 Enhanced cable . 18
B.1.3 Enhanced connector . 18
B.2 Channel SNR margin-to-capacity . 18
B.2.1 General . 18
B.2.2 Margin-to-capacity calculation and comparison . 18
B.2.3 Margin-to-capacity versus frequency. 19
B.2.4 Margin-to-capacity versus reach . 20
Bibliography . 21
© ISO/IEC 2020
Figure B.1 – Margin-to-capacity versus frequency for 25 Gbit/s rate for 50 m reach . 19
Figure B.2 – Margin-to-capacity versus reach for 25 Gbit/s at 1 000 MHz frequency . 20
Table 1 – Enhancement methods for 25 Gbit/s extended reach . 9
Table 2 – Formulae for return loss specifications for example 50 m channel . 10
Table 3 – Formulae for insertion loss specifications for example 50 m channel . 10
Table 4 – Formulae for pair-to-pair NEXT specifications for example 50 m channel . 11
Table 5 – Formula for PS NEXT specifications for example 50 m channel . 11
Table 6 – Formulae for ACR-F specifications for example 50 m channel . 12
Table 7 – Formulae for PS ACR-F specifications for example 50 m channel . 12
Table 8 – Formulae for PS ANEXT specifications for example 50 m channel . 13
Table 9 – Formulae for PS AACR-F specifications for example 50 m channel . 13
Table 10 – Formulae for propagation delay specifications for a 50 m channel . 13
Table 11 – Delay skew specifications for a 50 m channel . 13
Table 12 – TCL for example 50 m channel . 14
Table 13 – ELTCTL for example 50 m channel . 14
Table 14 – Coupling attenuation for example 50 m channel for E and E . 14
1 2
– 4 – ISO/IEC TR 11801-9909:2020
© ISO/IEC 2020
INFORMATION TECHNOLOGY –
GENERIC CABLING FOR CUSTOMER PREMISES –
Part 9909: Evaluation of balanced cabling in support
of 25 Gbit/s for reach greater than 30 metres
FOREWORD
1) ISO (the International Organization for Standardization) and IEC (the 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 through technical committees established by the
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collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental,
in liaison with ISO and IEC, also take part in the work.
2) The formal decisions or agreements of IEC and ISO on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
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3) IEC and ISO documents have the form of recommendations for international use and are accepted by IEC and
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The main task of IEC and ISO technical committees is to prepare International Standards.
However, a 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 11801-9909, 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 and
ISO websites.
© ISO/IEC 2020
The text of this Technical Report is based on the following documents:
DTR Report on voting
JTC1-SC25/2932/DTR JTC1-SC25/2948/RVDTR
Full information on the voting for the approval of this Technical Report can be found in the
report on voting indicated in the above table.
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