TECHNICAL REQUIREMENTS FOR
ELECTROMAGNETIC DISTURBANCE EMITTED FROM
TELECOMMUNICATIONS EQUIPMENT
TR NO.550004 Edition 4.1
1st, April, 2015
Nippon Telegraph and Telephone Corporation
Nippon Telegraph and Telephone Corp.
NOTICE
This document provides a summary of the basic technical requirements for the limits, test
methods, etc. for the electromagnetic disturbance emitted from telecommunications equipment
used and provided by Nippon Telegraph and Telephone Corporation (NTT). This document is
intended as reference material to be used by telecommunication equipment designers and
manufacturers.
The content of this document may be changed without notice when related standards are
revised, new equipment technology is introduced, or equipment requirements are modified.
If you have any questions about the content of this document, please contact the following
sections.
NTT Network Technology Laboratories
Environmental Technology and Management Project
EMC Technology Group
Telephone:
+81-422–59–7655
Fax:
+81-422–59–5681
E–mail: emc.spec@lab.ntt.co.jp
© 2015 NTT
This document may not be copied or reproduced in any form without written permission from
NTT.
Nippon Telegraph and Telephone Corp.
Contents
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1
1.1 Purpose
・・・・・・・・・・・・
1
1.2 Outline
・・・・・・・・・・・・
1
1.3 Applicability
・・・・・・・・・・・・
1
・・・・・・・・・・・・
2
2.1 References
・・・・・・・・・・・・
2
2.2 Terminology
・・・・・・・・・・・・
3
3. Technical requirements
・・・・・・・・・・・・
5
・・・・・・・・・・・・
5
3.1.1 Limits
・・・・・・・・・・・・
5
3.1.2 Test methods and test facilities
・・・・・・・・・・・・
10
・・・・・・・・・・・・
11
3.2.1 Limits
・・・・・・・・・・・・
11
3.2.2 Test methods and test facilities
・・・・・・・・・・・・ 14
1. Overview
2. References and terminology
3.1 Requirements for customer-premises equipment
and outdoor-locations equipment
3.2 Requirements for telecom-center equipment
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Nippon Telegraph and Telephone Corp.
1. Overview
1.1 Purpose
To control the radiated and conducted disturbance emitted from telecommunications
equipment, this document prescribes limits and measurement methods for electromagnetic
disturbances emitted from the following equipment: l) telecommunications equipment containing
digital circuits, microprocessors, or switching power supplies that are used in a telecommunication
center controlled by a telecommunication provider and 2) information technology equipment
installed and used in outdoor-locations and customer- premises .
NOTE: Equipment reporting compliance with the VCCI regulations or already regulated by other
standards, such as the Electrical Appliance and Material Control Law, Radio Law, and ARIB
STD-T57, is excluded from the scope of this document.
1.2 Outline
Section 2 describes key terms used and laws and regulations referred to in this document and
some information that is relevant when this document is used.
Section 3 describes requirements related to limits and measurement methods for
electromagnetic disturbances emitted from customer-premises equipment, outdoor-locations
equipment, and telecom-center equipment.
1.3 Applicability
This document shall be applied when the specifications are enacted or revised with changes of
the circuits in customer-premises, outdoor-locations, and telecom-center equipment from April 1,
2010. For radiated disturbance above 1 GHz, this document shall be applied when the
specifications are enacted or revised with changes of the circuits in customer-premises,
outdoor-locations, and telecom-center equipment from October 1, 2010.
The TR No. 550004 edition 3 may be applied in the following conditions.
1) Procure equipment reporting compliance with the VCCI regulations by March 31, 2010 without
change of circuits for customer-premises and outdoor-locations equipment.
2) Procure telecom-center equipment from April 1, 2010 to March 31, 2011.
Equipment classifications are shown in Table 1. Equipment is subdivided into two categories,
denoted Class A and Class B.
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Table 1 Classification of equipment limits and adaptation
Radiated disturbance
Conducted disturbance
≦ 1 GHz
> 1 GHz
Mains ports
Telecom. ports
Telecom-center
Class A
Class A
Class A
Class A
Outdoor-locations
Class B
Class B
Class B
Class B
Customer-premises*
Class A/B
Class A/B
Class A/B
Class A/B
* Class A or Class B can be selected due to the location of the customer-premises equipment.
2. References and terminology
2.1 References
[1] Report from Telecommunication Technology Council: 2007, Partial Reply to Inquiry No.
3 “About Various Standards of International Special Committee on Radio Interference (CISPR)”:
“Limits and Measurement Methods of Radio Disturbance Characteristics of the ITE” (in Japanese)
[2] VCCI rules for voluntary control measures, V-2: 2009 (original in Japanese)
[3] CISPR 22, edition 5.2: 2006, Information technology equipment – Radio disturbance
characteristics – limits and methods of measurement
[4] EN55022: 2006, Information technology equipment – Radio disturbance characteristics –
limits and methods of measurement
[5]
ETS300 386-1: 1994, 1997, Equipment engineering (EE); Public telecommunications
network equipment electromagnetic compatibility (EMC) requirements; Part 1: Product family
overview, compliance criteria and test levels
[6] FCC Part 15: 2000
[7] ARIB STD-T57: 1999, EMC standard for radio-communication equipment (in Japanese)
[8] 3GPP TS 25.113: 1999, Technical Specification Group Radio Access Network; Base Station
(BS) and repeater ElectroMagnetic Compatibility (EMC)
[9] 3GPP TS 36.113: 1999, Evolved Universal Terrestrial Radio Access (E-UTRA); Base
Station (BS) and repeater ElectroMagnetic Compatibility (EMC)
[10] ITU-T K.38; 1996, Radiated emission test procedure for physically large systems
[11] TTC JT-K38: 1998, Radiated emission test procedure for physically large systems (in
Japanese)
[12] ITU-T K.48; 2006, EMC requirements for each telecommunication network equipment
[13] TTC JT-K48: 2004, EMC requirements for each telecommunication network equipment
(in Japanese)
[14]
CISPR 16-1-1 edition 2.1: 2006, Specification for radio disturbance and immunity
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measuring apparatus and methods – Part 1-1: Radio disturbance and immunity measuring
apparatus – Measuring apparatus
[15]
CISPR 16-1-2 edition 1.2: 2006, Specification for radio disturbance and immunity
measuring apparatus and methods – Part 1-2: Radio disturbance and immunity measuring
apparatus – Ancillary equipment – Conducted disturbances, Amendment 1
[16]
CISPR 16-1-4 edition 2: 2007, Specification for radio disturbance and immunity
measuring apparatus and methods – Part 1-4: Radio disturbance and immunity measuring
apparatus – Ancillary equipment – Radiated disturbances
[17]
CISPR 16-2-3 edition 2: 2006, Specification for radio disturbance and immunity
measuring apparatus and methods – Part 2-3: Methods of measurement of disturbances and
immunity – Radiated disturbance measurements
[18]
CISPR 16-4-2: 2003, Specification for radio disturbance and immunity measuring
apparatus and methods – Part 4-2: Uncertainties, statistics and limit modeling – Uncertainty in
EMC measurement
The outside references quoted in this document are the latest editions.
2.2 Terminology
(1) information technology equipment (ITE): Equipment with a rated power supply voltage
not exceeding 600 V, whose primary function is any of the following or a combination of any of the
following: entry, storage, display, retrieval, transmission, processing, switching, or control of data
and of telecommunication messages. ITE might have one or more terminal ports typically operated
for information transfer.
(2) telecom-center equipment: Telecommunications equipment or facilities used only within
buildings that are supervised by telecommunications operators. The equipment is classified as
Class-A ITE.
(a) Switching, transmission, power supply, and radio equipment.
(b) Peripheral equipment directly connected to or used with the equipment listed in (a),
e.g., workstations controlling the equipment listed in (a).
(c) Equipment mounted on vehicles (excluding vehicle components and components designed
as part of telecommunications equipment),
e.g., radio transmitting and receiving equipment on radio-relay vehicles.
(3) outdoor-locations equipment: ITE used for telecommunications in outdoor-locations (e.g.,
telegraph pole, roadside, basement, outside wall, and so on). The equipment is classified as Class-B
ITE.
(4)
customer-premises equipment: ITE used for telecommunications other than
"telecom-center equipment" and "outdoor-locations equipment". The equipment is classified as
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either Class-A or Class-B ITE based on the installation environment. Class-A and Class-B ITE are
defined in (5).
(5) Class-A/Class-B ITE: Class-A ITE is equipment that satisfies the Class-A ITE disturbance
limits but not the Class-B disturbance limits. Class-B ITE is equipment that satisfies the Class-B
ITE disturbance limits. It is intended primarily for use in a domestic environment and may include
the following.
(a) Equipment with no fixed place of use, e.g., portable equipment powered by built-in
batteries.
(b) Telecommunication terminal equipment powered from a telecommunication network.
(c) A personal computer or portable word processor, as well as peripheral equipment
connected to it.
(d) Facsimile equipment.
Note: A domestic environment is an environment where broadcast radio and television
services might be used within a distance of 10 m from the ITE concerned, i.e., a residential
environment.
(6) electric-field strength of radiated disturbance: The electric field strength of the disturbance
radiated from the equipment directly into the air.
(7) disturbance voltage at mains ports: The voltage of the radio frequency disturbance
induced at power ports.
(8) disturbance at telecommunication ports: The voltage or current of the radio frequency
disturbance induced at telecommunication ports.
(9)
VCCI: Abbreviation for "Voluntary Control Council for Interference by Information
Technology Equipment". It was established to voluntarily control the disturbance radiated from
ITE in Japan.
(10) CISPR: French acronym meaning "International Special Committee on Radio Interference".
This special committee was established by the International Electrotechnical Commission to study
standards for limits, test methods, and test facilities with regard to radiated emission.
(11) EN: European norms established by CENELEC (Comite Europeen de Normalisation
Electrotechnique).
(12) ETS: European telecommunications standards established by ETSI (European
Telecommunications Standards Institute).
(13) FCC: Abbreviation for "Federal Communications Commission" in the United States.
(14) ARIB: Abbreviation for "Association of Radio Industries and Businesses" in Japan.
(15) ITU-T: Abbreviation for "International Telecommunication Union-Telecommunication
standardization sector".
(16) TTC: Abbreviation for "Telecommunication Technology Committee" in Japan.
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3. Technical requirements
3.1 Requirements for customer-premises equipment and outdoor-locations equipment
3.1.1 Limits
Limits for the disturbances emitted from customer-premises equipment and outdoor-locations
equipment are as follows.
Electric-field strength of radiated disturbance
A) Limits below 1 GHz
Quasi-peak values for the electric-field strength of the radiated disturbance should be no
greater than the values at the specified distance given in Tables 2 and 3. Table 2 gives the limits for
Class-A ITE and Table 3 for Class-B ITE.
Table 2 Limits for electric-field strength of radiated disturbance
from Class-A ITE (quasi-peak values)
Measurement distance
10 m
Frequency range
30 MHz to 230 MHz
40 dBμV/m
230 MHz to 1 GHz
47 dBμV/m
Note l: 1 μV/m is taken to be 0 dB.
Note 2: The lower limit shall apply at the transition frequency.
Note 3: Add 10 dB to the limit when the measurement distance is 3 m.
Subtract 10 dB from the limit when the measurement distance is 30 m.
Table 3 Limits for electric-field strength of radiated disturbance
from Class-B ITE (quasi-peak values)
Measurement distance
10 m
Frequency range
30 MHz to 230 MHz
30 dBμV/m
230 MHz to 1 GHz
37 dBμV/m
Note l: 1 μV/m is taken to be 0 dB.
Note 2: The lower limit shall apply at the transition frequency.
Note 3: Add 10 dB to the limit when the measurement distance is 3 m.
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B) Limits above 1 GHz
The electric-field strength of the radiated disturbance should be no greater than the values at
the specified distance given in Tables 4 and 5 when measured in accordance with the method and
conditional testing procedure described below. Tables 4 and 5 give the limits for Class-A ITE and
Class-B ITE, respectively.
Table 4 Limits for electric-field strength of radiated disturbance from Class-A ITE
Measurement distance
3m
Frequency range
Average
Quasi-peak
1 to 3 GHz
56 dBμV/m
76 dBμV/m
3 to 6 GHz
60 dBμV/m
80 dBμV/m
Note: The lower limit shall apply at the transition frequency.
Table 5 Limits for electric-field strength of radiated disturbance from Class-B ITE
Measurement distance
3m
Frequency range
Average
Quasi-peak
1 to 3 GHz
50 dBμV/m
70 dBμV/m
3 to 6 GHz
54 dBμV/m
74 dBμV/m
Note: The lower limit shall apply at the transition frequency.
<Conditional testing procedure>
The highest internal source of an EUT is defined as the highest frequency generated or used within
the EUT or on which the EUT operates or tunes.
If the highest frequency of the internal sources of the EUT is less than 108 MHz, the measurement
shall only be made up to 1 GHz.
If the highest frequency of the internal source of the EUT is between 108 MHz and 500 MHz, the
measurement shall only be made up to 2 GHz.
If the highest frequency of the internal source of the EUT is between 500 MHz and 1 GHz, the
measurement shall only be made up to 5 GHz.
If the highest frequency of the internal source of the EUT is above 1 GHz, the measurement shall
be made up to 5 times the highest frequency or 6 GHz, whichever is less.
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Disturbance voltage at AC mains ports
The quasi-peak and average disturbance voltages at AC mains ports should be no greater than
the values specified in Tables 6 and 7. Table 6 gives the limits for Class-A ITE and Table 7 for
Class-B ITE.
Table 6 Limits for disturbance voltage at Class-A ITE AC mains ports
Detection type
Quasi-peak value Average value
Frequency range
150 kHz to 500 kHz
79 dBμV
66 dBμV
500 kHz to 30 MHz
73 dBμV
60 dBμV
Note 1: 1 μV is taken to be 0 dBμV.
Note 2: If the quasi-peak value of the measurement is less than the limit
specified for average-value detection, the equipment shall be deemed to meet
both limits and there is no need to take an average-value measurement.
Note 3: The lower limit shall apply at the transition frequency.
Table 7 Limits for disturbance voltage at Class-B ITE AC mains ports
Detection
Type
Quasi-peak value
Average value
Frequency range
150 kHz to 500 kHz
66 – 56 dBμV
56 – 46 dBμV
500 kHz to 5 MHz
56 dBμV
46 dBμV
5 MHz to 30 MHz
60 dBμV
50 dBμV
Note 1: 1μV is taken to be 0 dBμV.
Note 2: If the quasi-peak value of the measurement is less than the limit
specified for average-value detection, the equipment shall be deemed to meet
both limits and there is no need to take an average-value measurement.
Note 3: The limit shall decrease linearly with the logarithm of the frequency
in the range of 150 kHz to 500 kHz.
Note 4: The lower limit shall apply at the transition frequency.
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Disturbance voltage at DC mains ports
The quasi-peak and average disturbance voltages at DC mains ports should be no greater than
the values specified in Tables 8 and 9. Table 8 gives the limits for Class-A ITE and Table 9 for
Class-B ITE.
Table 8 Limits for disturbance voltage at Class-A ITE DC mains ports
Detection type
Quasi-peak value Average value
Frequency range
150 kHz to 500 kHz
79 dBμV
66 dBμV
500 kHz to 30 MHz
73 dBμV
60 dBμV
Note 1: 1 μV is taken to be 0 dBμV.
Note 2: If the quasi-peak value of the measurement is less than the limit
specified for average-value detection, the equipment shall be deemed to meet
both limits and there is no need to take an average-value measurement.
Note 3: The lower limit shall apply at the transition frequency.
Table 9 Limits for disturbance voltage at Class-B ITE DC mains ports
Detection type
Quasi-peak value Average value
Frequency range
150 kHz to 500 kHz
66 - 56 dBμV
56-46 dBμV
500 kHz to 5 MHz
56 dBμV
46 dBμV
5 MHz to 30 MHz
60 dBμV
50 dBμV
Note 1: 1 μV is taken to be 0 dBμV.
Note 2: If the quasi-peak value of the measurement is less than the limit
specified for average-value detection, the equipment shall be deemed to meet
both limits and there is no need to take an average-value measurement.
Note 3: The lower limit shall apply at the transition frequency.
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Disturbance voltage (current) at telecommunication ports
The quasi-peak and average disturbance voltages or currents at telecommunication ports
should be no greater than the values specified in Tables 10 and 11. Table 10 gives the limit for
Class-A ITE and Table 11 for Class-B ITE.
Table 10 Limits for disturbance voltage (current) at Class-A ITE telecommunication ports
Voltage dB(μV)
Current dB(μA)
Frequency range
MHz
Quasi-peak
Average
Quasi-peak
Average
0.15 to 0.5
97-87
84-74
53-43
40-30
0.5 to 30
87
74
43
30
Note 1: The limits shall decrease linearly with the logarithm of the frequency range 150
kHz to 500 kHz.
Note 2: Conversion factor between voltage and current limits is 20log10 150 = 44 dB
Note 3: This table is adopted in accordance with clause 1.3.
Table 11 Limits for disturbance voltage (current) at Class-B ITE telecommunication ports
Voltage dB(μV)
Current dB(μA)
Frequency range
MHz
Quasi-peak
Average
Quasi-peak
Average
0.15 to 0.5
84-74
74-64
40-30
30-20
0.5 to 30
74
64
30
20
Note 1: The limits shall decrease linearly with the logarithm of the frequency range 150
kHz to 500 kHz.
Note 2: Conversion factor between voltage and current limits is 20log10 150 = 44 dB
Note 3: This table is adopted in accordance with clause 1.3.
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3.1.2 Test methods and test facilities
Disturbances emitted from customer-premises equipment should be measured using the test
site and test method specified in the applicable standards listed below. Class-A ITE may be
measured for electric-field strength of the radiated disturbance at the user’s installation site if the
equipment is restricted in its installation environment.
(1) VCCI rules for voluntary control measures
(2) CISPR 22, edition 5.2.
(3) EN55022
(4) ETS300 386-1
(5) FCC part 15
(6) ARIB STD-T57
(7) 3GPP TS 25.113
(8) 3GPP TS 36.113
(9) ITU-T K.38
(10) TTC JT-K38
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3.2 Requirements for telecom-center equipment
3.2.1 Limits
Limits for the disturbances emitted from telecom-center equipment are as follows.
Electric-field strength of radiated disturbance
A) Limits below 1 GHz
Quasi-peak values for the electric-field strength of the radiated disturbance should be no
greater than the values at the specified distance given in Table 12.
Table 12 Limits for electric-field strength of radiated disturbance (quasi-peak values)
Measurement distance
10 m
Frequency range
30 MHz to 230 MHz
40 dBμV/m
230 MHz to 1 GHz
47 dBμV/m
Note l: 1 μV/m is taken to be 0 dB.
Note 2: The lower limit shall apply at the transition frequency.
Note 3: Add 10 dB to the limit when the measurement distance is 3 m.
Subtract 10 dB from the limit when the measurement distance is 30 m.
B) Limits above 1 GHz
The electric-field strength of the radiated disturbance should be no greater than the values at
the specified distance given in Table 13 when measured in accordance with the method and
conditional testing procedure described below. Table 13 gives the limits for Class-A ITE.
Table 13 Limits for electric-field strength of radiated disturbance from Class-A ITE
Measurement distance
3m
Frequency range
Average
Quasi-peak
1 to 3 GHz
56 dBμV/m
76 dBμV/m
3 to 6 GHz
60 dBμV/m
80 dBμV/m
Note: The lower limit shall apply at the transition frequency.
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<Conditional testing procedure>
The highest internal source of an EUT is defined as the highest frequency generated or used within
the EUT or on which the EUT operates or tunes.
If the highest frequency of the internal sources of the EUT is less than 108 MHz, the measurement
shall only be made up to 1 GHz.
If the highest frequency of the internal source of the EUT is between 108 MHz and 500 MHz, the
measurement shall only be made up to 2 GHz.
If the highest frequency of the internal source of the EUT is between 500 MHz and 1 GHz, the
measurement shall only be made up to 5 GHz.
If the highest frequency of the internal source of the EUT is above 1 GHz, the measurement shall
be made up to 5 times the highest frequency or 6 GHz, whichever is less.
Disturbance voltage at AC mains ports
The quasi-peak and average disturbance voltages at AC mains ports should be no greater than
the values specified in table 14.
Table 14 Limits for disturbance voltage at AC mains ports
Detection type
Quasi-peak value Average value
Frequency range
150kHz to 500kHz
79 dBμV
66 dBμV
500kHz to 30MHz
73 dBμV
60 dBμV
Note 1: 1 μV is taken to be 0 dB.
Note 2: If the quasi-peak value of the measurement is less than the limit specified
for average-value detection, the equipment shall be deemed to meet both limits
and there is no need to take an average-value measurement.
Note 3: The lower limit shall apply at the transition frequency.
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Disturbance voltage at DC mains ports
The quasi-peak and average disturbance voltages at DC mains ports should be no greater than
the values specified in Table 15.
Table 15 Limits for disturbance voltage at DC mains ports
Detection type
Quasi-peak value Average value
Frequency range
150 kHz to 500 kHz
79 dBμV
66 dBμV
500 kHz to 30 MHz
73 dBμV
60 dBμV
Note 1: 1 μV is taken to be 0 dB.
Note 2: If the quasi-peak value of the measurement is less than the limit specified
for average-value detection, the equipment shall be deemed to meet both limits
and there is no need to take an average-value measurement.
Note 3: The lower limit shall apply at the transition frequency.
Disturbance voltage (current) at telecommunication ports
The quasi-peak and average disturbance voltages or currents at telecommunication ports
should be no greater than the values specified in Table 16.
Table 16 Limits for disturbance voltage (current) at telecommunication ports
Voltage dB(μV)
Current dB(μA)
Frequency range
MHz
Quasi-peak
Average
Quasi-peak
Average
0.15 to 0.5
97-87
84-74
53-43
40-30
0.5 to 30
87
74
43
30
Note 1: The limits shall decrease linearly with the logarithm of the frequency range 150
kHz to 500 kHz.
Note 2: Conversion factor between voltage and current limits is 20log10 150=44 dB
Note 3: This table is adopted in accordance with clause 1.3.
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3.2.2 Test methods and test facilities
The disturbances emitted from the telecom-center equipment should be measured using the
test site and test method specified in the applicable standards listed below. The electric-field
strength of the radiated disturbance may be measured at the user’s installation site.
(1) VCCI rules for voluntary control measures
(2) CISPR 22, edition 5.2.
(3) EN55022
(4) ETS300 386-1
(5) FCC part 15
(6) ARIB STD-T57
(7) 3GPP TS 25.113
(8) 3GPP TS 36.113
(9) ITU-T K.38
(10) TTC JT-K38
(11) ITU-T K.48
(12) TTC JT-K48
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