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

ISO/IEC TR 11801-9909:2020, which is a Technical Report, covers evaluation and recommendations for achieving extended reach, greater than 30 m, for 25 Gbit/s applications over balanced cabling channels.
This document covers channel reference implementations, based on Category 8.1 and Category 8.2, 2 000 MHz, components.
The channel and component category specifications covered in this document are not intended to be normative.

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Status
Published
Publication Date
21-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
22-Jun-2020
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ISO/IEC TR 11801-9909:2020 - 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
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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
ISO/IEC TR 11801-9909:2020-06(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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

---------------------- Page: 3 ----------------------
– 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

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ISO/IEC TR 11801-9909:2020 – 3 –
© 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
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– 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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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.
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ISO/IEC TR 11801-9909:2020 – 5 –
© 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.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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 understanding

of its contents. Users should therefore print this document using a colour printer.

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– 6 – ISO/IEC TR 11801-9909:2020
© ISO/IEC 2020
INTRODUCTION

This document provides an evaluation of balanced cabling in support of 25 Gbit/s data

transmission. The evaluation covers enhanced balanced cabling channel specifications, which

are based on Category 8.1 and Category 8.2 balanced cabling components. The enhanced

channel specifications are intended to support extended reach greater than 30 m.

The extended reach evaluation is intended to support various emerging use-cases including

• 25 Gbit/s LAN,
• extended reach high definition audio/video,
• Wi-Fi® application greater than 10 Gbit/s, and
• 5G intrabuilding sites.
___________

Wi-Fi is a registered trademark of Wi-Fi Alliance. This information is given for the convenience of users of this

document and does not constitute an endorsement by ISO or IEC.
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ISO/IEC TR 11801-9909:2020 – 7 –
© 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
1 Scope
This part of ISO/IEC 11801, which is a Technical Report, covers evaluation and

recommendations for achieving extended reach, greater than 30 m, for 25 Gbit/s applications

over balanced cabling channels.

This document covers channel reference implementations, based on Category 8.1 and Category

8.2, 2 000 MHz, components.

The channel and component category specifications covered in this document are not intended

to be normative.
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 11801-1, Information technology – Generic cabling for customer premises –

Part 1: General requirements
3 Terms and definitions
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/IEC 11801-1 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 https://www.iso.org/obp
3.2 Abbreviated terms

For the purposes of this document, the abbreviated terms given in ISO/IEC 11801-1 and the

following apply.
SNR signal to noise ratio
NVP nominal velocity of propagation
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– 8 – ISO/IEC TR 11801-9909:2020
© ISO/IEC 2020
4 Extended reach channel specifications
4.1 General

Balanced cabling channels in accordance with ISO/IEC 11801-1:2017, Class I and Class II,

are intended to support link data rate operating at 25 Gbit/s – for example,
ISO/IEC/IEEE 8802-3:2017/AMD3:2017 25GBASE-T – with link reach up to 30 m.

NOTE 1 ISO/IEC/IEEE 8802-3:2017/AMD3:2017 25GBASE-T link segment specifications are referenced, see

ISO/IEC TR 11801-9905.

Class I and Class II balanced cabling channels in accordance with ISO/IEC 11801-1:2017 are

implemented using Category 8.1 and Category 8.2 balanced screened cabling components,

respectively.

NOTE 2 ISO/IEC/IEEE 8802-3:2017/AMD3:2017 25GBASE-T is defined using Category 8.1 and Category 8.2 (Class I

and Class II, respectively) up to 1 250 MHz.

ISO/IEC 11801-1 allows for variation in channel implementation configurations that maintain

conformance to channel specifications.

Enhanced channel reference implementations use two connections, with two 2 m, 20 % derated

cords attached to the ends of a permanent link, so that the permanent link length is equal to

the channel length (in metres) minus 4 m.

Enhanced channels can provide additional SNR margin-to-capacity, which can potentially

support additional reach, see Annex B.

NOTE 3 The possibility of additional reach can be verified with manufacturers of specific equipment before

deployment.

Extended reach channel reference implementations, greater than 30 m, are evaluated over four

reach ranges: ≤ 40 m, ≤ 50 m, ≤ 67 m, and ≤ 100 m; see Table 1.
Balanced cabling covered by this document:
a) is specified in accordance with ISO/IEC 11801-1;

b) is tested in accordance with ISO/IEC 11801-1, i.e. as specified in IEC 61935-1.

4.2 Channel performance enhancement methods for increased SNR
4.2.1 General

Table 1 shows the enhancement method considerations for 25 Gbit/s and 25GBASE-T operation

over various extended reach cabling channels using Category 8.1 and Category 8.2
components.

NOTE 25GBASE-T can be supported only by channels which fully conform to the ISO/IEC/IEEE 8802-3:2017/AMD3

25GBASE-T link segment specifications, see 4.2.2.
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ISO/IEC TR 11801-9909:2020 – 9 –
© ISO/IEC 2020
Table 1 – Enhancement methods for 25 Gbit/s extended reach
Channel length, L
Reach range 30 < L ≤ 40 40 < L ≤ 50 50 < L ≤ 67 68 < L ≤ 100
Application 25 Gbit/s and 25 Gbit/s 25 Gbit/s 25 Gbit/s
supported 25GBASE-T
Recommended channel enhancement method
Channel Reduced delay and Reduced delay and Reduced delay and Reduced delay and
component delay skew in delay skew in delay skew in delay skew in
Category 8.1 accordance with accordance with accordance with accordance with
4.2.2. 4.2.2, and 4.2.2, 4.2.2,
Enhanced cable in Enhanced cable in Enhanced cable in
accordance with accordance with accordance with
4.2.3. 4.2.3, and 4.2.3, and
Enhanced Enhanced
connector in connector in
accordance with accordance with
4.2.4. 4.2.4.
Channel Red
...

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