ETSI TR 101 562 V1.1.1 (2011-05)

Technical Report
PowerLine Telecommunications (PLT);
MIMO PLT Universal Coupler,
Operating Instructions - Description

2 ETSI TR 101 562 V1.1.1 (2011-05)

Reference
DTR/PLT-00033
Keywords
coupling, MIMO, powerline
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3 ETSI TR 101 562 V1.1.1 (2011-05)
Contents
Intellectual Property Rights . 4
Foreword . 4
Introduction . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Symbols and abbreviations . 5
3.1 Symbols . 5
3.2 Abbreviations . 6
4 Major Project Phases . 6
5 Motivation . 6
6 MIMO PLT Universal Coupler . 7
7 Safety note . 8
8 Objectives of the MIMO PLT (STF 410) design . 8
9 Technical Data of Couplers . 9
9.1 Impedance conditions . 9
9.2 Insertion Loss . 10
10 Operation . 10
10.1 SISO transmit and SISO receive (example P-N to P-N) . 10
10.2 MIMO symmetric transmit (example N-E), MIMO receive star plus CM . 11
10.3 MIMO asymmetric transmit (example N-E), MIMO receive star plus CM . 11
10.4 SISO common mode transmit and SISO common mode receive . 12
10.5 Alternative MIMO mode using dual wire feed. 13
11 Circuit diagram . 15
12 Measurement Results . 17
12.1 SISO . 17
12.2 MIMO symmetric . 18
12.3 MIMO Delta transmit to star receive . 19
12.4 Common mode Reception . 21
12.5 Alternative MIMO modes (dual wire feed) . 22
Annex A: Bibliography . 23
History . 24

ETSI
4 ETSI TR 101 562 V1.1.1 (2011-05)
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 Report (TR) has been produced by ETSI Technical Committee Powerline Telecommunications (PLT).
Introduction
In order to study and compare MIMO (Multiple Input Multiple Output) characteristics of the LVDN network in
different countries the STF 410 (Special Task Force) was set up. The present document is one of three TRs which
present the result of the work of STF 410. The present document describes the universal couplers used for feeding and
receiving MIMO PLT signals. The other TRs created by STF410 utilize the couplers described here.
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5 ETSI TR 101 562 V1.1.1 (2011-05)
1 Scope
The present document is a description of the MIMO PLT couplers used for feeding and receiving signals to and from
the mains grid.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
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 necessary for the application of the present document.
Not applicable.
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] Sartenaer, T. & Delogne, P.: "Powerline Cables Modelling for Broadband Communications",
ISPLC 2001, pp. 331-337.
[i.2] R. Hashmat (1), P. Pagani (1), T. Chonavel (2), (1: Orange Labs, France), (2: Telecom Bretagne,
France), "MIMO Capacity of Inhome PLC Links up to 100 MHz", Workshop on PLC 2009 -
Udine - Italy.
[i.3] A. Schwager: "Powerline Communications: Significant Technologies to become Ready for
Integration" Doctoral Thesis at University of Duisburg-Essen, May 2010.
3 Symbols and abbreviations
3.1 Symbols
For the purposes of the present document, the following symbols apply:
dB decibel (logarithmic unit)
dBm 10 * log (P / 1 mW)
Hz Hertz
L Inductance
m meter
MHz Mega Hz
nF nanoFarads
nH nanoHenry
Ω Ohm
Z Impedance
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6 ETSI TR 101 562 V1.1.1 (2011-05)
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
BNC Bayonet Nut Connector
C "Center point" of the coupler
CM Common Mode
DM Differential Mode
E protective Earth
EP connection E to P
LVDN Low Voltage Distribution Network
MIMO Multiple Input Multiple Output
N Neutral
NE connection N to E
P Phase
PE Protective Earth
PLT PowerLine Telecommunications
PN connection P to N
Rx Receive
S Switch
SISO Single Input Single Output
STF Special Task Force
sym symmetrical
t Turns
T Transformer
TR Technical Report
Tx Transmit
4 Major Project Phases
Table 1
No. Period Topic Event
st
01 Jan. 2010 1 version of the present document for 14 identical couplers are manufactured and
STF 410 internal use shipped to the STF experts.
02 Feb 2010 and Verification of couplers Couplers are used by STF410 expert in
later field measurements in private homes.

5 Motivation
PLT systems available today use only one transmission path between two outlets. It is the differential channel between
live and neutral contact. Such systems are called SISO (Single Input Single Output) modems. MIMO PLT systems do
not use one transmission path only. The utilisation of the third wire, the PE (Protective Earth) wire allows several
combinations to feed and receive signals into and from the LVDN. Various research publications [i.1], [i.2] or [i.3]
describe that up to 8 transmission paths might be used simultaneously.
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7 ETSI TR 101 562 V1.1.1 (2011-05)
Further descriptions of:
• motivation for MIMO PLT;
• installation types and the existence of the PE wire in private homes;
• measurement setup description to record throughput communication parameters and their result;
can be found in the further documents published by STF410.
6 MIMO PLT Universal Coupler
Figure 1: Photograph of coupler from top

Figure 2: Photograph of coupler, case opened
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8 ETSI TR 101 562 V1.1.1 (2011-05)
7 Safety note
• STF 410 MIMO coupler are designed and built with great care.
• STF 410 couplers have to be used exclusively for tests carried out by instructed personnel.
• It is recognized that the connection of the Protective Earth of the STF 410 MIMO couplers does not comply
with safety standards for commercial products.
• For best protection of the connected instruments, it is recommended:
- to first switch off all interfaces;
- then to connect the instruments;
- then to connect the coupler to the mains; and
- then switch on whatever is required for the operation (see clause 9).
8 Objectives of the MIMO PLT (STF 410) design
General requirements:
• Safety for field use by instructed personnel (but no formal safety test).
• Safety for connected test equipment (50 Hz level, surge protection).
• Well defined electrical characteristics to get reproducible measurement res
...