ISO IEC TS 11801-9903-2021 PDF

Full title and description

St ISO IEC TS 11801-9903-2021 — Information technology — Generic cabling systems for customer premises — Part 9903: Matrix modelling of channels and links. This Technical Specification establishes a matrix-model for formulating limits for mixed‑mode parameters within and between two pairs of balanced cabling to support improved balanced cabling channel and link specifications.

Abstract

ISO/IEC TS 11801-9903:2021 defines a matrix-based modelling approach for mixed‑mode transmission parameters (including differential, common and mixed‑mode interactions) in two‑pair balanced cabling. The model is intended to support specification development and performance limits for channels and links in the ISO/IEC 11801 family.

General information

• Status: Withdrawn / superseded (see revised edition published 2025).
• Publication date: 17 March 2021 (Edition 1.0).
• Publisher: Joint ISO/IEC publication (prepared by ISO/IEC JTC 1/SC 25).
• ICS / categories: 35.200 — Interface and interconnection equipment.
• Edition / version: Edition 1.0 (2021).
• Number of pages: 48 pages.

Scope

This Technical Specification provides a formal matrix model and associated terminology for calculating and expressing limits for mixed‑mode transmission parameters within and between two pairs of balanced cabling. The scope covers formulation of limits for parameters such as return loss, insertion loss and near/far‑end crosstalk in mixed‑mode form, and is intended to support development of channel and link specifications in the ISO/IEC 11801 series.

Key topics and requirements

• Matrix modelling of two‑pair balanced cabling channels and links (S‑parameter / mixed‑mode representation).
• Formulation of limits for mixed‑mode parameters: insertion loss, return loss, near‑end and far‑end crosstalk in mixed‑mode terms.
• Definitions and modelling methods to derive complete differential‑, mixed‑ and common‑mode link and channel models.
• Support for development of updated channel and link specifications within the ISO/IEC 11801 family.

Typical use and users

Engineers and designers of structured cabling systems, cabling and connector manufacturers, test‑laboratories and certification bodies, system integrators, and standards committees use this specification as a modelling reference when developing or validating channel and link performance limits and test approaches for two‑pair balanced cabling in customer premises environments.

Related standards

Part of the ISO/IEC 11801 family (generic cabling systems for customer premises). This TS replaces earlier TR 11801‑9903:2015 and was subsequently revised by ISO/IEC TS 11801‑9903:2025 (second edition). Implementers should consider the other parts of ISO/IEC 11801 for cabling classes, channel/link definitions and test methods.

Keywords

matrix model, mixed‑mode, two‑pair, balanced cabling, S‑parameters, insertion loss, return loss, near‑end crosstalk, far‑end crosstalk, ISO/IEC 11801, channel modelling, link modelling.

FAQ

Q: What is this standard?

A: It is ISO/IEC TS 11801‑9903:2021, a Technical Specification that provides a matrix modelling approach for mixed‑mode parameters in two‑pair balanced cabling and supports the ISO/IEC 11801 family.

Q: What does it cover?

A: It covers the mathematical and conceptual model (matrix/S‑parameter based) for representing and setting limits for mixed‑mode transmission parameters (insertion loss, return loss, near/far‑end crosstalk and related quantities) within and between two pairs of balanced cabling.

Q: Who typically uses it?

A: Cabling designers and manufacturers, test laboratories and certification bodies, systems integrators, and standards developers use it to derive, validate or harmonize channel and link specifications and to model multi‑mode interactions in two‑pair cabling.

Q: Is it current or superseded?

A: The 2021 edition has been superseded by a revised second edition published in 2025; the 2021 version is designated as withdrawn in the ISO lifecycle. Users should consult the 2025 revision for the latest technical content.

Q: Is it part of a series?

A: Yes — it is a sub‑part (9903) of the ISO/IEC 11801 series (generic cabling for customer premises) and follows earlier technical reports and specifications in that family.

Q: What are the key keywords?

A: Matrix modelling, mixed‑mode, S‑parameters, two‑pair, balanced cabling, crosstalk, insertion loss, return loss, ISO/IEC 11801.