ISO/IEC 14709-2:1998
(Main)Information technology — Configuration of customer premises cabling (CPC) for applications — Part 2: Integrated Services Digital Network (ISDN) primary rate
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 applications — Partie 2: Accès primaire au réseau numérique à intégration de services (RNIS)
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Standards Content (Sample)
INTERNATIONAL ISOAEC
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 I ’informa tion -
Configuration du cablage dans /es locaux d ’usagers (CPC)
pour /es applications -
Partie 2: Acc& primaire au r&eau numerique a integration
de Services (RNIS)
0 ISOAEC 1998
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-2- 14709-2 0 ISO/IEC: 1998 (E)
CONTENTS
Page
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~. 3
FOREWORD
4
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clause
5
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Normative references
3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
........................................................................................ 6
4 Abbreviations and Symbols
Abbreviations . . 6
4.1
7
4.2 Symbols .
................................................................................................. 7
5 Design requirements
7
5.1 General .
Insertion loss . . . 7
5.2
7
5.3 Power feeding .
........................................................................... 8
5.4 Electromagnetit environment
8
5.5 Spurs .
5.6 Near-end crosstalk loss (NEXT) . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Point-to-Point configurations
Component requirements within dedicated ISDN cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.1 General
7.2 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.2.1 General
7.2.2 Characteristic impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.2.3 Attenuation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.2.4 Near-end crosstalk (NEXT) loss
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.2.5 Insulation resistance
7.3 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*. 10
7.4 Cords
10
8 Implementation over generic cabling Systems .
............................................................................................................ 10
8.1 General
..................................... 11
8.2 Connection of ISDN primary access to generic cabling
8.3 Requirements for ISDN primary access generic cabling adapters. . 12
9 Qualification of existing cabling . 12
............................................................................................................ 12
9.1 General
9.2 Spurs . 13
9.3 Cabling integrity . 13
................................................................................. 13
9.4 Characteristic impedance
................................................................................................... 13
9.5 Insertion loss
........................................................................................ 13
9.6 Insulation resistance
Near-end crosstalk (NEXT) loss . 13
9.7
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14709-2 0 ISOAEC: 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, lSO/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 tSO/IEC 14709-2 has been prepared by Joint Technical Committee
ISOAEC 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 1.431 (Blue Book, Volume Ill) and
contain additional requirements as well as modifications of ITU-T 1.431 and IEC 60603-7.
The reader is referred to IEC 60950 for general safety requirements.
Other Standards in the series are:
ISOAEC 14709-1 :1997, Information technology - Customer Premises Cabling (CPC) for
- Part 1: Integrated Services Digital Network (ISDN) basic access
applica tions
ISOAEC 14763-l :-, Information technology - Implementation and Operation of Customer
Part 1: Administration 1)
Premises Cabling -
ISOAEC 14763-2:-, Information technology - Implementation and Operation of Customer
Premises Cabling - Part 2: Planning and installation of topper cabling 2)
Information technology - lmplementa tion and Operation of Customer
ISOAEC 14763-3:-,
Premises Cabling - Part 3: Acceptance testing for Optical cabling2)
Information technology - Implementa tion and Operation of Customer
ISOAEC 14763-4:-,
Premises Cabling - Part 4: Testing of balanced topper cabling 2)
_--em-
‘) To be published.
2) Under consideration.
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-4- 14709-2 0 ISO/IEC:1998 (E)
INTRODUCTION
This part of ISOAEC 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 ISOAEC 11801.
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14709-2 0 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.
lt 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 1.431. The requirements in this Standard apply to the
cabling for both 1,544 Mbitk 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, ßectangular connectors for frequencies below 3 MHz - Part 8: Detail
specification for connectors, four-Signal contacts and earthing contacts for cable Screen
C I SP R 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
ISOAEC 11801: 1995, Information technology - Generic cabling for customer premises
ISOIIEC 14709-1 :1997, Information Technology - Customer Premises Cabling (CPC) for
Part 1: Integrated Services Digital Network (ISDN) basic access
applica tions -
ITU-T 1.431: (Blue Book) Integrated Services Digital Network (ISDN) - Primary user-network
interface - Layer 1
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14709-2 0 ISOIIEC: 1998 (E)
3 Definitions
For the purposes of this part of ISOAEC 14709 the definitions of ISOAEC 14709-1 and ISO/
IEC 11801 apply, of which the following are repeated below.
31
cible 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 ISOAEC 11801 :1995]
32
cfannel
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 ISOAEC 11801:1995]
33
Spul
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
Electromagnetit compatibility
EMC
FD Floor distributor
GC Generic cabling
ISDN Integrated Services digital network
NEXT Near-end crosstal k loss
NT Network termination
PBX Private branch exchange
TE Terminal equipment
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14709-2 0 ISO/IEC:1998 (E)
4.2 Symbols
Cabie
Network Termination
Dedicated cabling socket
Dedicated cabling plug
Generic cabling socket
(i.e. telecommunications outlet)
El
Generic cabling plug
5 Design requirements
5.1 General
Signals passing between the NTl/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 Q non-reactive Source and load impedances for 1,544 Mbit/s
transmission rate;
-
1,024 MHz with 120 Q 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 1.431.
5.3 Power feeding
In some cases power tan be supplied via the cabling from the TE to the NT1 or from the NT2
to the NTI. In these cases a separate pair dedicated to power feeding is required.
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-8- 14709-2 0 ISOAEC: 1998 (E)
5.4 Electromagnetit 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 tan be minimized by
employing good installation practice.
The impulsive noise generated by circuits carrying, for instance, analogue telephone Signals or
some unbalanced data transmission, tan Cause interference with Signals carried on the ISDN
cabling. Interference by crosstalk tan 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 tan 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 emission and CISPR 24 for immunity.
5.5 Spurs
There shall be no spurs in the ISDN primary access cabling.
5.6 Near-end crosstalk loss (NEXT)
The NEXT of the cabling shall be greater than 25 dB at frequencies up to 1,0 MHz in
accordance with the Class B link requirements of ISOAEC 11801 and the System requirements
of ITU-T 1.431.
6 Point-to-Point configurations
Point-to-Point configurations are illustrated in figure 1.
1
4
NT1
’ or
NT2
/ .
NT1
TE ,
I or
NT2
\ *
c f
NT2
NT1
d, is the distance between the NT1 and the Point of connection of the customer ’s terminal
equipment. d, also applies to the distance between NT1 and NT2.
Figure 1 - Point-to-Point configurations
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14709-2 0 ISO/IEC:1998 (E) 9
Figure 1 is also relevant for the connection of an NT1 to an NT2.
The TE tan be connected to the cabling in one of three ways
-
via a plug at the end of a cord connected to the TE;
-
hardwired, e.g. by the use of insulation displacement connectors incorporated in the TE;
- via a socket within the TE.
The insertion loss is measured over the distance d, in figure 1 and shall not be greater than
specified in 5.2.
Two pairs shall be available: one for the transmit circuit and one for the receive circuit.
It is recommended that the polarity of each wire be maintained throughout the length of the
cabling to facilitate testing and provide more effective cable management.
7 Component requirements within dedicated ISDN cabling
7.1 General
Cabling specifically designed to support ISDN primary rate Services shall comprise components
which meet the requirements of 7.2, 7.3 and 7.4.
The implementation of ISDN primary rate applications over generic cabling in accordance with
ISOAEC 11801 is defined in clause 8.
7.2 Cables
7.2.1 General
Balanced cables (twisted pair or star quads) shall be used. The cable or cable elements may
be screened or unscreened (see 5.4).
7.2.2 Characteristic impedance
The characteristic impedance of the cable shall be in accordance with table 1.
Table 1 - Characteristic impedance requirements
Transmission rate
I
1,544 Mbit/s 2,048 Mbitk
/ I
Chatacteristic impedance
Frequency
MHz i-2
0,200 - 0,772 100 Zl: 20
0,772
100 I!I 10 12Ok24
Not specified
0,772 - 1
1 Not specified 120 Ik 12
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14709-2 0 ISO/IEC:1998 (E)
-lO-
7.2.3 Attenuation
The attenuation of the cable shall be such that the requirements of 5.2 are met.
7.2.4 Near-end crosstalk (NEXT) loss
The NEXT loss for 100 m of cable shall be greater than 43 dB at frequencies up to 0,772 MHz
and 41 dß at frequencies up to 1,O MHz.
7.2.5 Insulation resistance
The insulation resistance of the cable shall be greater than 50 MQ x km when measured at
20 “C and 500 V dc. A measurement of the insulation resistance of existing cabling at 50 V d.c.
tan be used to indicate the likely presence of cable defects (see 9.5).
7.3 Connectors
The socket used to connect the terminal equipment to the cabling shall be in accordance with
t
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