SC 25

Revision April 2019

ISO/IEC JTC 1/SC 25 Interconnection of information technology equipment


ISO/IEC JTC 1/SC 25 Interconnection of information technology equipment is a standardization subcommittee of the Joint Technical Committee ISO/IEC JTC 1, of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), which develops and facilitates standards within the field of interconnection of information technology equipment. The international secretariat of ISO/IEC JTC 1/SC 25 is the Deutsches Institut für Normung (DIN) located in Germany.

ISO/IEC JTC 1/SC 25 was formed in 1989 after the creation of ISO/IEC JTC 1. When ISO and IEC decided to create the joint technical committee, JTC 1, in 1988, there was a reorganization of the structure. Eventually in 1989, IEC SC 83: Information technology equipment and ISO/IEC JTC 1/SC 13: Interconnection of equipment, were joined to form the current subcommittee, ISO/IEC JTC 1/SC 25: Interconnection of information technology equipment. The new subcommittee also adopted the standardization activity of ISO/IEC JTC 1/SC 26, under ISO/IEC JTC 1/SC 25/WG 4.

Working groups in SC 25

ISO/IEC JTC 1/SC 25/WG 1   Home electronic systemsWG 1 Convenor & Members

WG 1 is responsible for the Home Electronic System1 (HES) series of standards. WG 1, develops standards for the interconnection of electrical and electronic equipment and products for homes and small buildings. The primary markets for WG 1 standards are developers, manufacturers, and installers of these products and related services.

WG1 standards for HES enable home and building occupants

  • to live more comfortably in the home,
  • to be more protected and feel safe in the home,
  • to work productively in smart buildings, and
  • to live and work more economically by reducing energy consumption and/or

producing and storing or selling excess energy.

WG 1 standards facilitate consumer electronic products, networks, and services to interoperate or to operate, where feasible, as a single coherent system. This system benefits all stakeholders including product developers, manufacturers, service providers, installers, utilities, and consumers. HES consists of a network of networks that enables interoperation among consumer products, sensors, control devices, and user interfaces in

WG 1 is pursuing projects that foster seamless delivery of applications developed linking home, apartment, enterprise and public networks. Standards for remote access and management of home equipment are being developed. Extensions to cloud-based services for home applications using the Internet of Things are being discussed. Therefore, standards developed in WG 1 are important for this emerging IoT market.

Homes are made intelligent with interconnected sensors, actuators, user interfaces, and controllers, which may be embedded in smart consumer appliances. The interconnection of public networks with home networks poses risks for consumer privacy, safety, and security, which are being addressed.

ISO/IEC JTC 1/SC 25/WG 3   Customer premises cabling

WG 3 is working on generic cabling system standards. The previously independent standards for office, industrial, homes and data centres have been brought into a series of ISO/IEC 11801 standards to improve the technical coherence of their contents and ease future maintenance; including work on distributed building services. Related to this activity, the revision of ISO/IEC TR 11801-9903 on matrix modelling of channels and links has been initiated. Project ISO/IEC 14763-4 (DIS was recently approved) specifies the pertinent measurement requirements of end-to-end links.

In support of the IEEE 802.3 activities, Technical Report ISO/IEC TR 11801-9905 is being developed to provide guidelines for the use of installed cabling to support 25GBASE-T and application.

In addition WG 3 has initiated work on a 1-pair cabling project to service emerging applications for Ethernet over one pair.

WG 3 has started the revision of ISO/IEC 14763-2 on installation of IT cabling to take into account requirements on new remote powering and other delayed topics.

For ISO/IEC 14763-3, an amendment is under preparation to update requirements for testing of optical fibre channels and visual inspection and cleaning of optical fibre interfaces.

ISO/IEC JTC 1/SC 25/WG 4   Interconnection of computer systems and attached equipment

WG4 standards are used in almost every computing platform around the world.    standardization work relies heavily on work done with the support and involvement of multinational corporations.

ISO/IEC JTC 1/SC 25/Project Team: Taxonomy and Terminology (PTTT)

The project team PT TT was established after JTC 1 asked SC 25 to take the lead in co-ordinating the standardisation activities for intelligent homes and held its first meeting in the year 2007. PT TT has two projects, one on taxonomy (Information technology – Intelligent homes – Taxonomy of specifications) and the other on terminology (Information technology – Terminology for intelligent homes). These are expected to greatly help SC 25 in their co-ordination activities.

The Taxonomy project consists of two parts. The first part (ISO/IEC TR 29107-1 Information technology – Intelligent homes – Taxonomy of specifications – Part 1: The taxonomy method) describes the taxonomy scheme by which specifications are characterized, and the second provides tables listing the specifications according to this scheme.

The Terminology project handles terms and definitions for intelligent homes. It collects terms and definitions from specifications not only from JTC 1 but also from other standards. When a term has more than one definition, these definitions are sorted according to quality, and for terms with no appropriate definition found, new definitions are created.

JTC 1/SC 25 Meetings:

JTC 1/SC 25 Beijing, China, September 2014

JTC 1/SC 25 in Milano, Italy, September 2015

JTC 1/SC 25 in Reutlingen, Germany, September 2016

JTC 1/SC 25 in Bruges, Belgium, September 2017

JTC 1 / SC 25 in Falls Church, Virginia, USA, September 2018.

Participating countries            28

Observer Countries                 17


ISO/IEC JTC 1/SC 25 – Secretariat DIN Germany

DIN Deutsches Institut für Normung e.V.

Am DIN-Platz
Burggrafenstrasse 6
D-10787 Berlin

Tel: +49 30 26 01-0

Fax: +49 30 26 01 12 31



Secretariat direct:

Mr Jürgen Tretter