ISO/IEC TR 11801-9909:2020

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
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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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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
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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.
...