ISO/IEC 15018:2004/Amd 1:2009

ISO/IEC 15018
Edition 1.0 2009-04
INTERNATIONAL
STANDARD

AMENDMENT 1
Information technology – Generic cabling for homes



ISO/IEC 15018:2009/A1:2009(E)

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ISO/IEC 15018
Edition 1.0 2009-04
INTERNATIONAL
STANDARD

AMENDMENT 1
Information technology – Generic cabling for homes



INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
C
ICS 35.200 ISBN 2-8318-1036-9

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– 2 – 15018 Amend. 1 © ISO/IEC:2009(E)

FOREWORD
Amendment 1 to International Standard ISO/IEC 15018 was prepared by subcommittee 25:
Interconnection of information technology equipment, of ISO/IEC joint technical committee 1:
Information technology.
_______________

2 Normative references
Add the following new reference:
IEC 60728-1:2007, Cable networks for television signals, sound signals and interactive
services – Part 1: System performance for forward paths
3 Terms, definitions and abbreviations
3.1 Terms and definitions
Add, after 3.1.39, the following new terms and definitions:
3.1.40
balun
device to provide impedance transformation between balanced and unbalanced components
3.1.41
external network interface
ENI
connexion device between external network and network access cabling.
NOTE For example, equipment comprising HNI, and baluns where applicable, complies with this definition.
3.1.42
home network interface
HNI
interface for access to the network for distribution of television signal, sound signals and
interactive services inside a home (single dwelling)
3.1.43
system outlet
SO
device for interconnecting a subscriber feeder and a receiver lead
[IEC 60728-1, 3.1.90]
3.2 Abbreviations
Add the following abbreviations in alphabetical order:
HF High frequency
UHF Ultra-high frequency
VHF Very high frequency

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15018 Amend. 1 © ISO/IEC:2009(E) – 3 –
Add, after Annex D, the following new Annex E:

Annex E
(informative)

Reference implementation of TV and radio applications –
Usage of baluns
E.1 Types and locations of baluns
E.1.1 General
The connection of a BCT-B channel to equipment that has a 75 Ω coaxial connection requires
the use of a balun.
Also the connection of a balanced BCT-B channel to a CATV network or any feeding coaxial
system requires the use of a balun at the HNI (Home Network interface).
Figures E.1 through to E.4 illustrate the location where a balun can be found in a home
(single dwelling).
NOTE By the use of baluns it is possible to run BCT applications via ICT permanent links in accordance with the
manufacturer’s instructions.

E.1.2 Baluns at the external network interface and baluns at the equipment interface
toward the PHD

PHD
ENI
Balanced
splitter
BCT-B permanent link
HNI Balun

Figure E.1 – Balun at the ENI (External Network Interface)
Figure E.1 illustrates a configuration where the home is fed with a coaxial system. A balun is
used to connect this coaxial system to balanced cabling including the Primary Home
Distributor (PHD).
It is assumed that in this case the balun belongs to the application dependent equipment and
therefore meets the application specific requirements to provide the home with signals
complying with IEC 60728 (see Figure E.5 below).
If the balun cannot cover the frequency range of forward (47 MHz to 862 MHz) and return
path (5 MHz to 65 MHz), two types of baluns should be used, each one in the appropriate
path.

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