ETSI TS 102 578 V1.2.1 (2008-08)

PowerLine Telecommunications (PLT); Coexistence between PLT Modems and Short Wave Radio broadcasting services

DTS/PLT-00021

General Information

• Status: Published
• Publication Date: 04-Aug-2008
• Technical Committee: PLT - Powerline Telecommunications
• Current Stage: 12 - Completion
• Due Date: 06-Aug-2008
• Completion Date: 05-Aug-2008

Standards Content (Sample)

ETSI TS 102 578 V1.2.1 (2008-08)
Technical Specification


PowerLine Telecommunications (PLT);
Coexistence between PLT Modems
and Short Wave Radio broadcasting services


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2 ETSI TS 102 578 V1.2.1 (2008-08)




Reference
DTS/PLT-00021
Keywords
EMC, powerline, radio
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3 ETSI TS 102 578 V1.2.1 (2008-08)

Contents
Intellectual Property Rights.4
Foreword.4
Introduction .4
1 Scope.5
2 References.5
2.1 Normative references.5
2.2 Informative references.6
3 Definitions and abbreviations.6
3.1 Definitions.6
3.2 Abbreviations.6
4 Detection of the presence of radio broadcasting signals .7
4.1 Noise Floor.8
4.2 Levels and Thresholds.8
4.3 Timings.9
4.4 Frequencies.9
5 Notching the transmitted signals .10
6 Verification of the implementations to the standard .11
6.1 Measurement apparatus.11
6.2 Settings on Spectrum Analyzer .13
6.3 Artificial Signal Ingress.13
6.4 Levels and thresholds at verification-bench .13
6.4.1 Level of signal ingress .13
6.4.2 Level of notch bottom.13
6.5 Test procedure.13
Annex A (normative): Test signals .15
History .16

ETSI

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4 ETSI TS 102 578 V1.2.1 (2008-08)

Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Powerline Telecommunications
(PLT).
Throughout the present document the term "broadcasting services" refers to "short wave radio broadcasting services".
Introduction
State of the art PowerLine Telecommunications (PLT) may cause coexistence limitations with broadcasting services. It
is intended that PLT Modems compliant with the present document will provide less interference or greater
orthogonality between broadcasting services and PLT Modems.
Requirements for the present document are:
• optimum reduction of interference between PLT and short wave radio broadcast;
• minimum impact on data throughput and QoS requirements of PLT.
The presence of broadcasting signals must be detected by PLT Modems by sensing the "noise" (including radio
broadcast picked up on the mains cabling) at an electrical socket. Frequencies where short wave Radio broadcasting
signals are identified must be omitted from the transmitted signal by inserting a notch into the transmitting spectrum.
This automatic process is called "Smart Notching".
ETSI

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5 ETSI TS 102 578 V1.2.1 (2008-08)

1 Scope
The present document specifies a mechanism for PLT modems to avoid possible coexistence difficulties between PLT
and Short Wave radio broadcast.
Frequency allocation of the radio broadcasting services are defined by ITU-R Radio Regulations [1].
The mechanism described here is called "smart notching" whereby the PLT-spectrum mask is adjusted to avoid the use
of frequencies which are found to be coincident with receivable broadcast signals.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] ITU Radio Regulations, edition of 2004.
[2] ETSI ES 201 980 (V2.2.1): "Digital Radio Mondiale (DRM); System Specification".
[3] ITU-R Recommendation 560-3: "Radio-frequency protection ratios in LF, MF and HF
broadcasting".
[4] ITU-R Recommendation BS.1615: ""Planning parameters" for digital sound broadcasting at
frequencies below 30 MHz".
[5] ITU-R Recommendation BS.703: "Characteristics of AM sound broadcasting reference receivers
for planning purposes".
[6] CISPR 16-1-1: "Specification for radio disturbance and immunity measuring apparatus and
methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus".
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6 ETSI TS 102 578 V1.2.1 (2008-08)

[7] CISPR 16-1-2: "Specification for radio disturbance and immunity measuring apparatus and
methods - Part 1-2: Radio disturbance and immunity measuring apparatus - Ancillary equipment -
Conducted disturbances".
[8] CISPR 22: "Information technology equipment - Radio disturbance characteristics - Limits and
methods of measurement".
2.2 Informative references
The following referenced documents are not essential to the use of the present document but they assist the user with
regard to a particular subject area. For non-specific references, the latest version of the referenced document (including
any amendments) applies.
Not applicable.
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
acceptable reception of radio service: human could understand what a speaking voice is trying to say
Class A device: PLT device as defined in CISPR 22 [8]
Class B device: PLT device as defined in CISPR 22 [8]
live: live contact (also known as phase, hot or active) carries alternating current from the power source to the equipment
measurement bandwidth: bandwidth used to specify limits and thresholds
NOTE: The resolution bandwidth a PLT modem uses to derive any signal level is implementation dependent. To
compare the derived levels with the values given in this specification they must be converted to the
measurement bandwidth.
neutral: neutral contact returns current from the equipment back to the power source or distribution panel
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AE Auxiliary Equipment
AM Amplitude Modulation
CE Consumer Electronics
DRM Digital Radio Mondiale
NOTE: See ES 201 980 [2] (http://www.drm.org/).
EUT Equipment Under Test
PLT PowerLine Telecommunications
NOTE: See http://portal.etsi.org/portal_common/home.asp?tbkey1=PLT.
PSD Power Spectral Density
QoS Quality of Service
SW Short Wave
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4 Detection of the presence of radio broadcasting
signals
Radio broadcast signals transmitted with a high power from the antenna of a radio station will electromagnetically
couple onto any wire, e.g. an electrical power grid.

Radio broadcast
transmitter

Figure 1: Example of ingress of radio signals into mains wiring in a house
Within the reception range of the radio broadcast signals the ingress of the broadcast signal can be detected.
Sensing the ingress magnitude at a PLT modem, e.g. at the socket between live and neutral line, enables the PLT
modem to identify the presence of a radio broadcast signal that is receivable by a typical CE radio receiver. Figure 2
shows a "snapshot" measurement of the noise between live and neutral at a socket using a spectrum analyzer. Each
"peak"
...