ISO/IEC 11801:1995/AMD1:1999
(Amendment)Amendment 1 - Information technology - Generic cabling for customer premises
Amendment 1 - Information technology - Generic cabling for customer premises
General Information
- Status
- Published
- Publication Date
- 22-Feb-1999
- Technical Committee
- ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
- Current Stage
- DELPUB - Deleted Publication
- Start Date
- 01-Oct-2002
- Completion Date
- 26-Oct-2025
Relations
- Effective Date
- 05-Sep-2023
- Effective Date
- 05-Sep-2023
Overview
ISO/IEC 11801:1995/AMD1:1999 is an amendment to the international generic cabling standard for customer premises. It refines requirements for telecommunications outlets (TO), link classification and channel lengths, characteristic impedance options, return loss testing, fire rating references, and multimode optical fibre performance. The amendment is intended to improve interoperability, clarify installer responsibilities, and align cabling parameters with evolving balanced and optical applications.
Key Topics
Telecommunications outlets (TO): The amendment requires a minimum of one TO per work area served by 100 Ω or 120 Ω cable (100 Ω preferred). Additional TOs may be supported by balanced cable or optical fibre. When balanced cable is used, 2-pair or 4-pair terminations must be provided and all pairs terminated; outlets with fewer than four pairs must be clearly marked.
Link classification and channel length: The amendment replaces the link classification table to define achievable channel lengths for different cabling categories and optical classes. The standard clarifies that the 100 m copper channel allowance includes patch cords/jumpers and work-area/equipment connections (typical allowance: 10 m flexible cable; 90 m horizontal plus 7.5 m patch cord and up to three connectors).
Characteristic impedance: Nominal characteristic impedance of a link may be 100 Ω, 120 Ω, or 150 Ω across the specified frequency range. The amendment emphasizes achieving impedance through appropriate cable and connector design.
Return loss and testing: Minimum return loss values at cabling interfaces are specified and must be measured in accordance with IEC 61935-1. Terminations matched to the nominal impedance (100 Ω, 120 Ω or 150 Ω) should be used during testing.
Fire rating: Fire rating requirements for balanced cabling reference IEC 61156, while allowing for local regulatory differences.
Multimode optical fibre: Cable transmission performance parameters are updated. The amendment provides attenuation and modal bandwidth requirements for common wavelengths (e.g., 0.85 μm and 1.3 μm) and notes practical link distance limits (multimode optical links shown up to 2 km; singlemode links up to 3 km within the scope of the standard).
Applications
This amendment supports architects, installers, and network planners involved in:
- Designing structured cabling for office and campus environments
- Specifying outlets and cabling to support balanced and optical applications
- Ensuring cabling meets interoperability requirements for voice, data and emerging services
- Establishing test procedures and acceptance criteria for installed links
Related Standards
- ISO/IEC 11801:1995 (base standard)
- IEC 61935-1 (cabling test methods / return loss measurement)
- IEC 61156 (balanced cable fire rating and construction)
For implementation, consult the full amendment text and the referenced IEC documents to ensure compliance with local regulations and the specific application requirements.
Frequently Asked Questions
ISO/IEC 11801:1995/AMD1:1999 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Amendment 1 - Information technology - Generic cabling for customer premises". This standard covers: Amendment 1 - Information technology - Generic cabling for customer premises
Amendment 1 - Information technology - Generic cabling for customer premises
ISO/IEC 11801:1995/AMD1:1999 is classified under the following ICS (International Classification for Standards) categories: 35.200 - Interface and interconnection equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO/IEC 11801:1995/AMD1:1999 has the following relationships with other standards: It is inter standard links to ISO/IEC 11801:1995, ISO/IEC 11801:2002. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO/IEC 11801:1995/AMD1:1999 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL
ISO/IEC
STANDARD
AMENDMENT 1
1999-02
Amendment 1
Information technology –
Generic cabling for customer premises
Amendement 1
Technologies de l’information –
Câblage générique des locaux d’utilisateurs
ISO/IEC 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any
means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
ISO/IEC Copyright Office Case postale 56 CH-1211 Genève 20 Switzerland
•
Commission
PRICE CODE
C
For price, see current catalogue
– 2 – 11801 Amend. 1 © ISO/IEC:1999(E)
FOREWORD
This amendment has been prepared by subcommittee 25: Interconnection of information
technology equipment, of ISO/IEC Joint Technical Committee 1: Information Technology.
The text of this amendment is based on the following documents:
Text for vote Report on voting
ISO/IEC 11801:1995 ISO/IEC JTC1/SC25 N484
DAM1 and DAM2
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
___________
Page 15
5.5.3 Telecommunications outlet
Replace the third paragraph with:
1)
A minimum of one TO served by 100 Ω or 120 Ω cable shall be provided at each work area
(100 Ω preferred). Other TOs shall be supported by either balanced cable or by optical fibre
2)
cable . In the horizontal cabling, at least one TO shall be configured as specified in item b of
6.1.3 (balanced or optical fibre cable) or at least one TO shall be served by either class D or
3)
optical class, as identified in 7.1.1. When a TO is supported by balanced cable, 2 pairs
or 4 pairs shall be provided at each TO; all pairs shall be terminated. If less than four pairs are
4)
provided, the outlet shall be clearly marked . Emerging balanced cable applications may be
limited by differential delay of pairs that serve a single telecommunications outlet. See clause 9
for TO specifications that correspond to each of the cables listed above.
Footnotes
Replace footnotes with:
1)
When the greatest flexibility is desired, four pair or two quad cable should be used (see Annex G).
2)
When the largest bandwidth is desired the use of optical fibre is recommended.
3)
Installation of 2 pairs not capable of forming class D links may limit the applications supported.
4)
See annex G for number and performance of pairs needed for different applications and their pin assignment.
11801 Amend. 1 © ISO/IEC:1999(E) – 3 –
Page 25
7.1.2 Link classification
Replace table 2 with:
Table 2 – Channel lengths achievable with different categories and types of cabling
Medium Channel length
Class A Class B Class C Class D Optical
class
1)
Category 3 balanced cable (8.1) 2 km 200 m 100 m ––
2)
Category 4 balanced cable (8.1) 3 km 260 m 150 m ––
2) 1)
Category 5 balanced cable (8.1) 3 km 260 m 160 m 100 m –
2) 2)
3 km 400 m 250 m 150 m –
150 Ω balanced cable (8.2)
3)
Multimode optical fibre (8.4) N/A N/A N/A N/A 2 km
4)
Singlemode optical fibre (8.5) N/A N/A N/A N/A 3 km
1)
The 100 m distance includes a total allowance of 10 m of flexible cable for patch cords / jumpers, work
area and equipment connections. Link specifications are
...
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