ISO/IEC TR 14543-2:2000

Information Technology - Home Electronic System (HES) Architecture - Part 2: Device modularity

HES standards address both interoperability requirements, interconnectivity requirements and plug-compatibility requirements. Devices are described as interoperable if the functionality of the higher communication layers is such that commands can be exchanged and result in meaningful action. For interconnectivity it is sufficient to specify mechanical, electrical, and functional (lower layer protocol) characteristics such that devices can be connected on a shared transmission medium. Plug-compatibility includes both interoperability and interconnection. It usually implies that a particular interface is claimed for a particular purpose, where showing a certain interface implies interworking capabilities. This is particularly the case in the consumer environment where the availability of a particular plug on two pieces of equipment is generally understood to mean that the devices can be interconnected and will work together. This part of ISO/IEC 14543 addresses the architectural aspects of interfaces by introducing the concepts of Functional Groupings (FG) and Reference Points (RP). These concepts provide a means to describe modularity of a device, and hence serve as a basis for device interface standards

General Information

• Status: Replaced
• Publication Date: 24-Oct-2000
• ICS: 35.240.67 - IT applications in building and construction industry
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Current Stage: DELPUB - Deleted Publication
• Start Date: 25-Oct-2000
• Completion Date: 13-Feb-2026

Relations

• Replaced By: ISO/IEC 14543-2-1:2006 - Information technology - Home electronic system (HES) architecture - Part 2-1: Introduction and device modularity
• Effective Date: 05-Sep-2023

Standards Content (Sample)

ISO/IEC TR 14543-2
Edition 1.0 2000-10
TECHNICAL
REPORT
Information technology – Home electronic system (HES) architecture –
Part 2: Device modularity
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ISO/IEC 14543-2
Edition 1.0 2000-10
TECHNICAL
REPORT
Information technology – Home electronic system (HES) architecture –

Part 2: Device modularity
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.240.67 ISBN 2-8318-5533-0

– 2 – TR 14543-2 © ISO/IEC:2000(E)

CONTENTS
Page
FOREWORD . 3

INTRODUCTION .5

Clause
1 Scope . 7

2 References . 7

3 Definitions. 7
4 Reference points and functional groupings. 8
4.1 General concepts. 8
4.2 Specific reference points and functional groupings in a home control system. 9
4.3 Functional groupings with specific names . 11
4.4 Requirements for standardization at reference points. 11
5 Position of reference points within the HES. 11
5.1 Position of the UI in HES Class 1 and HES Classes 2 and 3 . 11
5.2 Position of the process interfaces in the HES. 15
Figure 1 – Interoperability domain . 5
Figure 2 – Interconnectivity domain. 5
Figure 3 – Device Modularity through Functional Grouping and Reference Point . 6
Figure 4 – Reference points and functional groupings . 8
Figure 5 – Example of multiple reference points facing away from the network medium. 8
Figure 6 – Example of multiple reference points facing towards the network medium . 9
Figure 7 – Gateway between different parts of a home network. 9
Figure 8 – Location of reference points in the home control system. 10
Figure 9 – Location of standardized interfaces . 11
Figure 10 – Position of the Universal Interface . 12
Figure 11 – Conformance types A and B . 13
Figure 12 – Simplified representation of conformance types A and B. 13

Figure 13 – Examples of detachable, permanent and virtual implementations
of Reference Points. 14
Figure 14 – Position of process interfaces . 15
Table 1 – Functional groupings between reference points . 10

TR 14543-2 © ISO/IEC:2000(E) – 3 –

INFORMATION TECHNOLOGY –
HOME ELECTRONIC SYSTEM (HES) ARCHITECTURE –

Part 2: Device Modularity
FOREWORD
1) ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission) 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

respective organization to deal with particular fields of technical activity. ISO and IEC technical committees
collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental,
in liaison with ISO and IEC, also take part in the work.
2) In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC1.
Draft International Standards adopted by the joint technical committee are circulated to national bodies for
voting. Publication as an International Standard requires approval by at least 75 % of the national bodies
casting a vote.
3) Attention is drawn to the possibility that some of the elements of this Technical Report may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC and ISO technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
report of one of the following types:
• type 1, when the required support cannot be obtained for the publication of an Inter-
national Standard, despite repeated efforts;
• type 2, when the subject is still under technical development of where, for any other reason,
there is the future but not immediate possibility of an agreement on an International Standard;
• type 3, when the technical committee has collected data of a different kind from that which
is normally published as an International Standard, for example ‘state of the art’.
Technical reports of types 1 and 2 are subject to review within three years of publication to
decide whether they can be transformed into International Standards. Technical reports of
type 3 do not necessarily have to be reviewed until the data they provide are considered to be
no longer valid or useful.
ISO/IEC 14543-2, which is a technical report of type 2, was prepared by subcommittee 25:
Interconnection of information technology equipment, of ISO/IEC joint technical committee 1:
Information technology.
This publication was drafted in accordance with ISO/IEC directives, Part 3.

This document is issued in the type 2 technical report series of publications (according to
15.2.2 of the Procedures for the technical work of ISO/IEC JTC 1 (1998)) as a prospective
standard for provisional application in the field of the Home Electronic System (HES),
because there is an urgent requirement for guidance on how standards in this field should be
used.
This document is not to be regarded as an International Standard. It is proposed for provisional
application so that information and experience of its use in practice may be gathered.
Comments on the content of this document should be sent to IEC Central Office.
A review of this type 2 technical report will be carried out not later than three years after its
publication with the option of extension for a further three years of conversion either to an
International Standard or withdrawal.

– 4 – TR 14543-2 © ISO/IEC:2000(E)

ISO/IEC TR 14543: Information technology – Home Electronic system (HES) architecture
consists of three parts:
•
Part 1: Introduction
• Part 2: Device modularity
• Part 3: Communication layers

Additional parts are under preparation.

TR 14543-2 © ISO/IEC:2000(E) – 5 –

INTRODUCTION
This part of ISO/IEC TR 14543, is based on the following considerations.

HES standards address both interoperability requirements, interconnectivity requirements and
plug-compatibility requirements.

Devices are described as interoperable if the functionality of the higher communication layers
is such that commands can be exchanged and result in meaningful action. One or more

intermediate networks may be needed to provide a communication path. Direct plug-

compatibility or a common interface is not required for devices to interoperate (Figure 1).

Figure 1 – Interoperability domain
For interconnectivity it is sufficient to specify mechanical, electrical, and functional (lower
layer protocol) characteristics such that devices can be connected on a shared transmission
medium. The functionality of the interface, or in other words the higher application layer
functions to be conveyed across the interface, that is the functionality of the devices on both
sides of the interface, have no direct relationship to the interface as such (Figure 2).
Figure 2 – Interconnectivity domain
Plug-compatibility includes both interoperability and interconnection. It usually implies that a
particular interface is claimed for a particular purpose, where showing a certain interface
implies interworking capabilities. This is particularly the case in the consumer environment
where the availability of a particular plug on two pieces of equipment is generally understood
to mean that the devices can be interconnected and will work together.

This document on Device Modularity addresses the architectural aspects of interfaces by
introducing the concepts of Functional Groupings (FG) and Reference Points (RP). These
concepts provide a means to describe modularity of a device, and hence serve as a basis for
device interface standards (Figure 3). RPs are introduced in such a way that interfaces can be
defined later on to correspond to RP. An RP provides the basic functionality of potential
interfaces. The dual concept FG similarly provides the basic functionality of devices at both
sides of an interface. Products may comprise concatenated FGs in which case the RPs in
between vanish.
– 6 – TR 14543-2 © ISO/IEC:2000(E)

RP
FG
RP
FG
RP
Transmission medium
Figure 3 – Device Modularity through Functional Grouping and Reference Point
For practical reasons the FGs are defined in terms of the communication layers embodied in a
certain module. Hence the RPs are mapped onto the service boundaries of the
communication stack. This is the logical consequence of the combination of OSI model with
the unrelated concept of FG and RP, and not an intrinsic feature of OSI itself nor of FG or RP.
The OSI based aspects of modular (layered) communication and the interworking aspects of
HES Architecture are covered in the companion document on Communication Layers.

TR 14543-2 © ISO/IEC:2000(E) – 7 –

INFORMATION TECHNOLOGY –
HOME ELECTRONIC SYSTEM (HES) ARCHITECTURE –

Part 2: Device Modularity
1 Scope
This part of ISO/IEC TR 14543 discusses the architecture of a standardized home control
system, called the Home Electronic System, HES.
It also identifies reference points and functional groupings in a home control system. Clause 4
identifies reference points and interfaces to show possible positions of standardized
interfaces. Clause 5 places the reference points and interfaces of the HES in this context.
The detailed issues of addressing and application protocols for the the Home Electronic
System of different classes will be given in related standards.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of ISO/IEC 14543-2. For dated references, subsequent
ame
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