SIST EN 50173:1997/A1:2000
(Amendment)Information technology - Generic cabling systems - Amendment A1
Information technology - Generic cabling systems - Amendment A1
Corrigendum to A1 issued March 2000 * Superseded by EN 50173-1:2002
Informationstechnik - Anwendungsneutrale Verkabelungssysteme
Technologies de l'information - Systèmes génériques de câblage
Information technology - Generic cabling systems - Amendment A1
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50173:1997/A1:2000
01-junij-2000
Information technology - Generic cabling systems - Amendment A1
Information technology - Generic cabling systems - Amendment A1
Informationstechnik - Anwendungsneutrale Verkabelungssysteme
Technologies de l'information - Systèmes génériques de câblage
Ta slovenski standard je istoveten z: EN 50173:1995/A1:2000
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
35.110 Omreževanje Networking
SIST EN 50173:1997/A1:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50173:1997/A1:2000
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SIST EN 50173:1997/A1:2000
EUROPEAN STANDARD EN 50173/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM January 2000
ICS 33.040.50
English version
Information technology - Generic cabling systems
Technologies de l'information Informationstechnik Anwendungsneutrale
Systèmes génériques de câblage Verkabelungssysteme
This amendment A1 modifies the European Standard EN 50173:1995; it was approved by CENELEC on
2000-01-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This amendment exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and United Kingdom.
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
CENELEC
© 2000 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
European Committee for Electrotechnical Standardization
Ref. No. EN 50173:1995/A1:2000 E
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
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EN 50173:1995/A1:2000
Foreword
This amendment was prepared by CENELEC Technical Committee TC 215 “Electrotechnical aspects of
telecommunication equipment” under the framework of Mandate M/212 on telecommunication cables and
cabling systems.
The text of the draft was submitted to the formal vote and was approved by CENELEC as amendment A1 to
EN 50173 on 2000-01-01.
The following dates were fixed:
- latest date by which the amendment has to be
implemented at national level by publication of an
identical national standard or by endorsement (dop) 2001-01-01
- latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2002-01-01
_____________________________
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EN 50173:1995/A1:2000
Foreword of EN 50173
Replace twice “TC 115” by “TC 215” and replace “prEN 50098-2” by “EN 50098-2”
Clause 2
Add after EN 50082-1 the following references:
EN 50174-1 Information technology – Cabling installation - Part 1: Specification and quality assurance
EN 50289-1-6 (in preparation) Communication cables - Specifications for test methods - Part 1-6:
Electrical test methods - Electromagnetic performance
and
EN 50289-1-9 (in preparation) Communication cables - Specifications for test methods – Part 1-9:
Electrical test methods - Longitudinal conversion loss (unbalance attenuation)
Amend reference to EN 55022 to read: „(IEC/CISPR 22:1997)“
Add after EN 55022 the following reference:
EN 55024 Information technology equipment - Immunity characteristics - Limits and methods of
measurement (IEC/CISPR 24:1997)
Amend reference to EN 60603-7 to read: „(IEC 60603-7:1996)“
Add after EN 60825-2 the following reference:
EN 61935-1 (in preparation) Generic specification for the testing of balanced generic cabling in
accordance with ISO/IEC 11801 – Part 1: Test methods (IEC 61935-1)
Replace HD 323.2.14 by:
EN 60068-2-14 Environmental testing - Part 2: Tests - Test N: Change of temperature
(IEC 60068-2-14:1984 + A1:1986)“
Replace HD 323.2.38 by
EN 60068-2-38 Environmental testing - Part 2: Tests – Test Z/AD: Composite temperature/humidity cyclic
test (IEC 60068-2-38:1974)“
Add “60000” to any IEC number.
Subclause 3.2
Add the following abbreviations:
ELFEXT Equal level far-end crosstalk loss
FEXT Far-end crosstalk loss
PSACR Power sum attenuation to crosstalk loss ratio
PSELFEXT Power sum equal level far-end crosstalk loss
PSNEXT Power sum near-end crosstalk loss
Subclause 5.1
th
Replace the 5 paragraph by:
100 Ω and 120 Ω connecting hardware shall only provide a single direct onward connection for each
conductor and shall not provide any electrical contact between conductors. For example bridged taps shall
not be used.
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EN 50173:1995/A1:2000
Subclause 5.2.1
Replace the existing subclause 5.2.1 by the following text (including figures):
5.2.1 Horizontal distances
The maximum horizontal cable length shall be 90 m independent of medium (see figure 6). This is the cable
length from the mechanical termination of the cable in the floor distributor to the telecommunications outlet in
the work area.
In establishing the maximum length of the horizontal channel, the optional use of a crossconnect or an
interconnect places different requirements on the total length of the flexible cables used.
Figure 7 shows examples of horizontal channel implementations which reflect these differing requirements of
maximum cable length.
In Figure 7a, the maximum total length of work area cable, equipment cable and patch cord is 9 m based
upon flexible cables with 50% greater attenuation (dB/m) than the horizontal cable and includes a
crossconnect in the floor distributor.
In Figure 7b, the maximum total length of work area cable and equipment cable is 10 m also based upon
flexible cables with 50% greater attenuation (dB/m) than the horizontal cable and includes an interconnect in
the floor distributor.
In both cases the transition point is optional. It is required that the performance of the horizontal cabling is
not degraded by the inclusion of the transition point.
For optical fibre, the implementation is shown in Figure 7c. An optical fibre splice, in accordance with
clause 8, is allowed at both ends of the horizontal cable.
See clause 8 and Annex C for requirements for patch cords and other flexible cables. In all cases, equipment
cables that meet or have better performance characteristics than patch cord requirements are recommended.
BD FD
CD
EQP EQP
EQP
Terminal
F E
G
Equipment
TP TO
500 m 90 m
DCCampus BuildingB Horizontal cable A
backbone backbone
cable cable
2000 m
C, D = 20 m
F, G = 30 m
A, B, E see Figure 7
EQP application specific equipment
TP Transition Point
NOTE All lengths are mechanical
Figure 6 - Maximum cable lengths
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Channel
Permanent link
A+B+E = 9 m max.
EQP C C C C C TE
TP TO
FD
90 m max.
EB A
a) Balanced copper horizontal cabling (with crossconnect)
Channel
Permanent link
A+E = 10 m max.
EQP C C C C TE
TP TO
FD
90 m max.
E A
b) Balanced copper horizontal cabling (with interconnect)
Channel
Permanent link
A+E = 10 m max.
EQP C C s s C C TE
TO
FD
90 m max.
E A
c) Optical fibre cabling (with interconnect)
C connection (e.g. plug and jack or mated optical connection)
S optical fibre splice
EQP application specific equipment
NOTE 1 All lengths are mechanical lengths
NOTE 2 See Annex C for further information on flexible cables
Figure 7 - Examples of horizontal channel implementation
For balanced cabling the design of the channel should also take into account the effect of elevated operating
temperatures on attenuation.
NOTE Copper cable attenuation (dB/m) increases by approximately 2% for screened cable and 4% for unscreened
cable for a temperature increase of 10 °C.
Subclause 5.2.3
Amend the Note as follows:
NOTE See 8.2.5, 8.3.5 and 8.4.4 for telecommunications outlets requirements that correspond to each of the cables
listed above.
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Clause 6
Replace clause 6 by the following text:
6 Permanent link and channel specifications
6.1 Permanent links and channels
6.1.1 General
This clause defines the permanent link and channel performance requirements of installed generic cabling.
The performance of the cabling is specified for individual permanent links and channels and for two different
media types (balanced cables and optical fibre). A tutorial on the material in this clause is provided in
annex E.
The design rules of clause 5 can be used to create generic cabling links and channels containing
components according to clauses 7 and 8. It is not necessary to measure every parameter specified in this
clause as conformance may also be proved by suitable design. The permanent link and channel
specifications in this clause allow for the transmission of defined classes of applications over distances other
than those of clause 5, and/or using media and components with different transmission performance than
those of clauses 7 and 8.
Each permanent link and channel shall conform to the complete set of performance requirements defined for
that class of cabling.
The performance requirements described in this clause may be used as the basis for verification tests for any
implementation of this European Standard using the test methods defined, or referred to, by this clause. The
permanent link requirements are primarily intended to provide a basis for the acceptance testing of installed
cabling. The channel requirements are primarily for application developers but are able to be used for
troubleshooting or where application support is under development.
Permanent link and channel performance specifications shall be met for all temperatures at which the cabling
is intended to operate. Performance testing may be carried out at ambient temperature, but there shall be
adequate margins to account for temperature dependence of cabling components as per manufacturer's
specifications. The effects of ageing should also be taken into account. In particular, consideration should be
given to measuring performance at worst case temperatures, or calculating worst case performance based
on measurements made at other temperatures.
Care should be exercised in the interpretation of any results obtained from alternative test methods or
practices. When needed, correlation factors should be identified and applied.
6.1.2 Permanent links
The performance of a permanent link is specified at and between interfaces to the link. The permanent link
comprises only passive sections of cable and connecting hardware. A transition point may also be included in
the horizontal subsystem. The interface of the permanent link is the far end of the plug or connecting block,
where the flexible cable enters. The cable connected outside of the plug is not part of the permanent link
(see figure 11a).
Active and passive application-specific hardware is not addressed by this European Standard.
Figure 11b shows an example of terminal equipment in the work area connected to a host using three links;
two optical fibre links and a balanced cable link. The optical fibre and balanced cable links are connected
together using an optical fibre-to-balanced-cable converter, a cross connect and two equipment cables.
Interfaces to the cabling are at each end of a permanent link. Interfaces to the cabling are specified at the
telecommunications outlet and at any point where application specific equipment is connected to the cabling;
the work area and equipment cables are not included in the permanent link.
6.1.3 Channels
The performance of a balanced cabling channel is specified at and between connections to active equipment.
The cabling comprises only passive sections of cable, connecting hardware, work area cables, equipment
cables and patch cords.
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FD
TP
TO
Permanent Link
a) Permanent link
Terminal
CD BD FD
equipment
TO
TP
Optical fibre Balanced cable
Optical fibre
permanent link
permanent
permanent
link link
Host
Opto-electronic
converter
Interface to the generic cabling
Optional interface when using a crossconnection
b) Location of cabling interfaces and extent of associated permanent links
Terminal
FD
CD
BD TO
equipment
Balanced cable channel
Optical fibre
channel
Host
Opto-electronic
converter
Interface to the generic cabling
c) Location of cabling interfaces and extent of associated channels
FD
TP
TO
C
A
Horizontal cable
B
A + B + C = 9 m
(90 m)
NOTE For balanced cabling, the 9 m total length of work area, equipment, and patch cable is based on flexible
cables with 50% greater attenuation (dB/m) than the horizontal cable and allows for a cross-connection in the floor
distributor. This example results in a calculated channel attenuation of 24,0 dB at 100 MHz using category 5
component requirements. A longer channel length may be achieved using flexible cable lengths with lower attenuation
performance.
d) Class D channel implementation (with cross-connection)
FD
TP TO
5 m 5 m
Horizontal cable
(90 m)
NOTE For balanced cabling, the 10 m total length of work area and equipment cable is based on flexible cables
with 50% greater attenuation (dB/m) than the horizontal cable. This example results in a calculated channel
attenuation of 23,9 dB at 100 MHz using category 5 component requirements.
e) Class D channel implementation (with interconnection)
Figure 11: Examples of cabling systems
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EN 50173:1995/A1:2000
The interface of the channel is the far end of the work area or equipment cable just before the plug which is
connected to the equipment.
Figure 11c shows an example of terminal equipment in the work area connected to a host using two
channels; an optical fibre channel and a balanced cabling channel. The optical fibre and balanced cabling
channels are connected together using an optical fibre to balanced cable converter. There are four channel
interfaces; one at each end of the copper channel, and one at each end of the optical fibre channel.
Equipment connections are not considered to be part of the channel. All work area cables, equipment cables
and patch cords are included in the channel.
Figures 11d and 11e show examples of class D channel implementations with cross-connection and with
interconnection.
6.2 Classification of applications, links and channels
6.2.1 Application classification
Five application classes for cabling have been identified for the purposes of this European Standard. This
ensures that the limiting requirements of one system do not unduly restrict other systems.
The application classes are:
Application class A Includes speech band and low frequency applications. Copper cabling permanent
links and channels supporting class A applications are referred to as class A
permanent links and class A channels, respectively.
Application class B Includes medium bit rate data applications. Copper cabling permanent links and
channels supporting class B applications are referred to as class B permanent
links and class B channels, respectively.
Application class C Includes high bit rate data applications. Copper cabling permanent links and
channels supporting class C applications are referred to as class C permanent
links and class C channels, respectively.
Application class D Includes very high bit rate data applications. Copper cabling permanent links and
channels supporting class D applications are referred to as class D permant links
and class D channels, respectively.
Optical application class Includes high and very high bit rate data applications. Optical fibre permanent links
and channels supporting this application class are referred to as optical class
permanent links and optical class channels, respectively.
NOTE Permanent link specifications are provided for field test verification and channel values provide minimum
requirements for application support.
Annex F gives examples of applications that fall within the various application classes.
6.2.2 Link and channel classification
Generic cabling, when configured to support particular applications, comprises one or more permanent links
and channels. Five permanent link and channel classes are defined, which relate to the application classes
as indicated in 6.2.1.
Permanent link / channel class A is specified up to 100 kHz.
Permanent link / channel class B is specified up to 1 MHz.
Permanent link / channel class C is specified up to 16 MHz.
Permanent link / channel class D is specified up to 100 MHz.
Optical permanent link / channel class is specified to support applications specified at 10 MHz and above.
For copper cabling links, permanent link or channel classes A to D are specified such that they will provide
the minimum transmission performance to support applications of the related application class. Links and
channels of a given class will support all applications of a lower class. Class A is regarded as the lowest
class.
Optical parameters are specified for singlemode and multimode optical fibre links and channels.
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Class C and D permanent links and channels correspond to full implementations of category 3 and
category 5 horizontal cabling subsystems respectively, as specified in 5.2.
Table 2 relates the permanent link and channel classes to the cabling component categories of clauses 7
and 8. This table indicates the channel length over which the various applications may be supported.
The distances presented are based on near-end crosstalk loss (for copper cables), bandwidth (for optical
fibre cables) and attenuation limits for various classes. Other characteristics of applications, for example
propagation delay, may further limit these distances.
Consideration should be given, when specifying and designing cabling, to the possible future connection of
cabling subsystems to form longer links and channels. The performance of these longer links and channels
will be lower than that of any of the individual subsystem links and channels from which they are constructed.
Measurement of permanent links and channels should be made initially, upon installation of each cabling
subsystem. Testing of combined subsystems should be performed as required by the application.
Table 2 - Channel lengths achievable with different categories and types of cabling
Medium Channel length for link class
m
A B C D Optical
1)
Category 3 balanced cable (see 7.2) 2000 200 100 - -
2) 1)
Category 5 balanced cable (see 7.2) 3000 260 160 100 -
2) 2)
3000 400 250 150 -
150 Ω balanced cable (see 7.2)
3)
Multimode optical fibre (see 7.4) N/A N/A N/A N/A 2000
4)
Singlemode optical fibre (see 7.5) N/A N/A N/A N/A 3000
1) The 100 m distance includes a 90 m length permanent link and a maximum allowance of 10 m of flexible cable for
patch cords or jumpers, work area and equipment connections.
2) Applications limited by propagation delay may not be supported over lengths greater than 100 m. Application
standards should be consulted.
3) The minimum bandwidth for a 2000 m multimode optical channel is specified in 6.4.3. Multimode applications may
be limited to distances shorter than 2000 m. Consult application standards for limitations.
4) 3000 m is a limit defined by the scope of this European Standard and not a medium limitation.
6.3 Balanced permanent links and channels
6.3.1 General
The parameters specified in this subclause apply to permanent links with screened or unscreened cable
elements, with or without an overall screen, unless explicitly stated otherwise. Unless stated otherwise,
outline test configurations for all measurements on balanced cabling are given in annex A. Specialised test
instruments are required for high frequency field measurements on balanced cabling. The maximum
application frequencies are based on required permanent link
...
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