ISO/IEC 14709-2:1998

INTERNATIONAL
ISO/IEC
STANDARD
14709-2
First edition
1998-05
Information technology –
Configuration of Customer Premises Cabling (CPC)
for applications –
Part 2:
Integrated Services Digital Network (ISDN)
primary rate
Technologies de l'information –
Configuration du câblage dans les locaux d'usagers (CPC)
pour les applications –
Partie 2: Accès primaire au réseau numérique à intégration
de services (RNIS)
Reference number
INTERNATIONAL
ISO/IEC
STANDARD
14709-2
First edition
1998-05
Information technology –
Configuration of Customer Premises Cabling (CPC)
for applications –
Part 2:
Integrated Services Digital Network (ISDN)
primary rate
Technologies de l'information –
Configuration du câblage dans les locaux d'usagers (CPC)
pour les applications –
Partie 2: Accès primaire au réseau numérique à intégration
de services (RNIS)
 ISO/IEC 1998
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– 2 – 14709-2 © ISO/IEC:1998 (E)
CONTENTS
Page
FOREWORD . 3
INTRODUCTION . 4
Clause
1 Scope. 5
2 Normative references. 5
3 Definitions. 6
4 Abbreviations and symbols . 6
4.1 Abbreviations. 6
4.2 Symbols. 7
5 Design requirements. 7
5.1 General. 7
5.2 Insertion loss. 7
5.3 Power feeding. 7
5.4 Electromagnetic environment. 8
5.5 Spurs. 8
5.6 Near-end crosstalk loss (NEXT) . 8
6 Point-to-point configurations. 8
7 Component requirements within dedicated ISDN cabling. 9
7.1 General. 9
7.2 Cables. 9
7.2.1 General. 9
7.2.2 Characteristic impedance. 9
7.2.3 Attenuation. 10
7.2.4 Near-end crosstalk (NEXT) loss . 10
7.2.5 Insulation resistance. 10
7.3 Connectors. 10
7.4 Cords. 10
8 Implementation over generic cabling systems . 10
8.1 General. 10
8.2 Connection of ISDN primary access to generic cabling . 11
8.3 Requirements for ISDN primary access generic cabling adapters. 12
9 Qualification of existing cabling . 12
9.1 General. 12
9.2 Spurs. 13
9.3 Cabling integrity. 13
9.4 Characteristic impedance. 13
9.5 Insertion loss. 13
9.6 Insulation resistance. 13
9.7 Near-end crosstalk (NEXT) loss . 13

14709-2 © ISO/IEC:1998 (E) –   –3
INFORMATION TECHNOLOGY –
CONFIGURATION OF CUSTOMER PREMISES CABLING (CPC)
FOR APPLICATIONS –
Part 2: Integrated Services Digital Network (ISDN) primary rate
FOREWORD
ISO (the International Organization for Standardization) and IEC (the 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.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
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.
International Standard ISO/IEC 14709-2 has been prepared by Joint Technical Committee
ISO/IEC JTC 1: Information technology, Subcommittee SC 25: Interconnection of information
technology equipment.
This standard specifies Customer Premises Cabling for the connection of customer premises
equipment with 1,544 Mbit/s and 2,048 Mbit/s interfaces to ISDN primary access and leased
lines.
The requirements in this standard are derived from ITU-T I.431 (Blue Book, Volume III) and
contain additional requirements as well as modifications of ITU-T I.431 and IEC 60603-7.
The reader is referred to IEC 60950 for general safety requirements.
Other standards in the series are:
ISO/IEC 14709-1:1997, Information technology – Customer Premises Cabling (CPC) for
applications – Part 1: Integrated Services Digital Network (ISDN) basic access
ISO/IEC 14763-1:—, Information technology – Implementation and operation of Customer
1)
Premises Cabling – Part 1: Administration
ISO/IEC 14763-2:—, Information technology – Implementation and operation of Customer
2)
Premises Cabling – Part 2: Planning and installation of copper cabling
ISO/IEC 14763-3:—, Information technology – Implementation and operation of Customer
2)
Premises Cabling – Part 3: Acceptance testing for optical cabling
ISO/IEC 14763-4:—, Information technology – Implementation and operation of Customer
2)
Premises Cabling – Part 4: Testing of balanced copper cabling
________
1)
To be published.
2)
Under consideration.
– 4 – 14709-2 © ISO/IEC:1998 (E)
INTRODUCTION
This part of ISO/IEC 14709 is intended for use by those designing, planning, procuring,
installing or testing cabling for ISDN primary access within a customer's premises. The design
requirements are specified in clause 5; the minimum requirements for the associated
components are specified in clause 7. In addition, guidance is given for the use of generic
cabling in accordance with ISO/IEC 11801.

14709-2 © ISO/IEC:1998 (E) –   –5
INFORMATION TECHNOLOGY –
CONFIGURATION OF CUSTOMER PREMISES CABLING (CPC)
FOR APPLICATIONS –
Part 2: Integrated Services Digital Network (ISDN) primary rate
1 Scope
This part of ISO/IEC 14709 specifies the design and configuration of Customer Premises
Cabling for the connection of primary access ISDN equipment.
It includes
– design requirements for ISDN primary access point-to-point configuration;
– cabling requirements for the installation of new cabling;
– criteria for the use of existing cabling;
– criteria for implementation of ISDN primary access on generic cabling systems according
to ISO/IEC 11801.
This standard applies to the customer premises cabling for the transmission of ISDN primary
access signals as defined by ITU-T I.431. The requirements in this standard apply to the
cabling for both 1,544 Mbit/s and 2,048 Mbit/s interfaces.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute
provisions of this part of ISO/IEC 14709. At the time of publication, the editions indicated were
valid. All standards are subject to revision, and parties to agreements based on this part of
ISO/IEC 14709 are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below. Members of IEC and ISO maintain registers of
currently valid International Standards.
IEC 60603-7:1996, Connectors for frequencies below 3 MHz for use with printed boards –
Part 7: Detail specification for connectors, 8-way, including fixed and free connectors with
common mating features, with assessed quality
IEC 60807-8:1992, Rectangular connectors for frequencies below 3 MHz – Part 8: Detail
specification for connectors, four-signal contacts and earthing contacts for cable screen
CISPR 22:1997, Information technology equipment – Radio disturbance characteristics – Limits
and methods of measurement
CISPR 24:1997, Information technology equipment – Immunity characteristics – Limits and
methods of measurement
ISO/IEC 11801:1995, Information technology – Generic cabling for customer premises
ISO/IEC 14709-1:1997, Information Technology – Customer Premises Cabling (CPC) for
applications – Part 1: Integrated Services Digital Network (ISDN) basic access
ITU-T I.431: (Blue Book) Integrated Services Digital Network (ISDN) – Primary user-network
interface – Layer 1
– 6 – 14709-2 © ISO/IEC:1998 (E)
3 Definitions
For the purposes of this part of ISO/IEC 14709 the definitions of ISO/IEC 14709-1 and ISO/
IEC 11801 apply, of which the following are repeated below.
3.1
cable unit
single assembly of one or more cable elements usually of the same type or category. The cable
unit may have a screen
NOTE – A binder group is an example of a cable unit.
[3.1.8 of ISO/IEC 11801:1995]
3.2
channel
end-to-end transmission path connecting any two pieces of application-specific equipment.
Equipment cables and work area cables are included in the channel
[3.1.13 of ISO/IEC 11801:1995]
3.3
spur
multiple appearances of the same conductor or conductors continuing past the point of
termination. Otherwise known as bridged taps
4 Abbreviations and symbols
4.1 Abbreviations
BD Building distributor
CD Campus distributor
DC Direct current
EMC Electromagnetic compatibility
FD Floor distributor
GC Generic cabling
ISDN Integrated services digital network
NEXT Near-end crosstalk loss
NT Network termination
PBX Private branch exchange
TE Terminal equipment
14709-2 © ISO/IEC:1998 (E) –   –7
4.2 Symbols
Cable
NT Network Termination
Dedicated cabling socket
Dedicated cabling plug
Generic cabling socket
(i.e. telecommunications outlet)
Generic cabling plug
5 Design requirements
5.1 General
Signals passing between the NT1/NT2 and TE or signals passing between the NT1 and NT2
are subject to attenuation, distortion and induced noise. These signals may also cause
electromagnetic radiation. Cabling components (including extension cords, adapters, cross-
connect components, sockets, junction boxes etc.) and cable all contribute to these effects.
5.2 Insertion loss
The insertion loss is measured from the NT1 to the TE, or from NT1 to NT2 at
– 0,772 MHz with 100 Ω non-reactive source and load impedances for 1,544 Mbit/s
transmission rate;
– 1,024 MHz with 120 Ω non-reactive source and load impedances for 2,048 Mbit/s
transmission rate.
The maximum insertion loss shall not exceed 6 dB in accordance with the system requirements
of ITU-T I.431.
5.3 Power feeding
In some cases power can be supplied via the cabling from the TE to the NT1 or from the NT2
to the NT1. In these cases a separate pair dedicated to power feeding is required.

– 8 – 14709-2 © ISO/IEC:1998 (E)
5.4 Electromagnetic environment
The performance of the ISDN primary access may be degraded by interference from external
sources of electromagnetic radiation (such as motors), and from electrical signals from other
applications carried under the same cable sheath. These effects can be minimized by
employing good installation practice.
The impulsive noise generated by circuits carrying, for instance, analogue telephone signals or
some unbalanced data transmission, can cause interference with signals carried on the ISDN
cabling. Interference by crosstalk can be limited by putting pairs or quads for ISDN primary
access in separate cables or cable units in the same cable.
EMC, emission and immunity to interference from the environment also have to be considered.
EMC can be improved by screening, balancing of equipment, balance of cabling, filtering or a
combination of these. However, all equipment and systems shall meet the requirements of EMC
standards. The current relevant standards are CISPR 22 for emi
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