BroadR-Reach®

Definitions for
Communication Channel
Version 2.0

Author & Company Dr. Bernd Körber, FTZ Zwickau

Title Definitions for Communication Channel
Version 2.0
Date November 28, 2014
Status Final version
Restriction Level Public

This measurement specification shall be used as a standardized common scale for evaluation of
general RF requirements for a physical layer communication channel to enable BroadR- Reach™
100Mbps Technology.
OPEN Alliance

AUTHORS

Daimler (Dr. Stefan Buntz), FTZ Zwickau (Dr. Bernd Körber), Leoni (Rainer Pöhmerer), Rosenberger
(Thomas Müller), TE Connectivity (Jens Wülfing)

CONTRIBUTORS

Broadcom (Mehmet Tazebay, Neven Pischl), Delphi (Michael Rucks), Ford Motor Company, Jaguar Land
Rover (John Leslie, Efstathios Larios), Molex (Mike Gardner, Sasha Babenko), NXP Semiconductors (Steffen
Lorenz), PSA Peugeot Citroen (Nicolas Morand), STMicroelectronics (Edoardo Lauri, Stefano Valle), Yazaki
(Matthias Jaenecke, Richard Orosz), Yazaki Systems Technologies GmbH (Dietrich v. Knorre, Vimalli
Raman)

These materials are reprinted with permission from Broadcom Corp., © 2013 Broadcom Corporation. The
implementation of the Broad-R Reach Physical Layer Transceiver Specification For Automotive
Applications may be covered by various Broadcom patents and other intellectual property rights in various
jurisdictions worldwide, which requires a license from Broadcom Corp. Redistribution of any portion of
the BroadR-Reach Specification is only permitted with the express written permission of Broadcom Corp.

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OPEN Alliance

Disclaimer

The OPEN Specifications (including any part thereof) are intended to be used as an information source to
enable to manufacture and test products which comply with the OPEN Specification.

All OPEN Specifications are provided on “as is” basis and all warranties, either explicit or implied, are
excluded unless mandatory under law. Accordingly, the OPEN Alliance Members who have contributed to
the OPEN Specifications make no representations or warranties with regard to the OPEN Specifications or
the information (including any software) contained therein, including any warranties of merchantability,
fitness for purpose, or absence of third party rights and make no representations as to the accuracy or
completeness of the OPEN Specifications or any information contained therein.

The OPEN Alliance Members who have contributed to the OPEN Specifications will not be liable for any
losses, costs, expenses or damages arising in any way out of use or reliance upon any OPEN Specification
or any information therein. Nothing in this document operates to limit or exclude any liability for fraud or
any other liability which is not permitted to be excluded or limited by operation of law.

The material contained in OPEN Specifications is protected by copyright and may be subject to other types
of Intellectual Property Rights. OPEN Specifications (or any part thereof) shall be distributed only among
those bound by the confidentiality defined for the OPEN Specification and as announced in the OPEN
Specification documents.

The distribution of OPEN Specifications shall not operate as an assignment or license to any recipient of
any OPEN Specification of any patents, registered designs, unregistered designs, trademarks, trade names
or other rights as may subsist in or be contained in or reproduced in any OPEN Specification. The
commercial exploitation of the material in this document may require such a license, and any and all
liability arising out of use without such a license is excluded.

OPEN Specification documents may be reproduced in electronic or paper form or utilized in order to
achieve the Scope only. Reproduction or utilization for any other purposes as well as any modification of
the Specification document, in any form or by any means, electronic or mechanical, including
photocopying and microfilm, is explicitly excluded.

Without prejudice to the foregoing, the OPEN Alliance Specifications have been developed for automotive
applications only. They have neither been developed, nor tested for non-automotive applications.

OPEN Alliance reserves the right to withdraw, modify, or replace any OPEN Specification at any time,
without notice.

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OPEN Alliance

Contents
1 Introduction .......................................................................................................................................... 6
1.1 Scope ............................................................................................................................................. 6
1.2 References .................................................................................................................................... 7
1.3 List of abbreviations and definitions............................................................................................. 8
2 General Definitions and Requirements................................................................................................. 9
3 Model for Communication Channel and Environment System .......................................................... 10
4 Test and Measurement definitions ..................................................................................................... 12
4.1 General definitions...................................................................................................................... 12
4.2 VNA measurement precautions and recommended settings .................................................... 12
4.3 Presentation of measurement results ........................................................................................ 13
4.4 Cable evaluation ......................................................................................................................... 14
4.4.1 General ................................................................................................................................ 14
4.4.2 Adaptation and matching ................................................................................................... 14
4.4.3 Definition of Measurement Reference Plane for Cable Tests ............................................ 15
4.5 Connector evaluation.................................................................................................................. 16
4.5.1 General ................................................................................................................................ 16
4.5.2 Definition of Measurement Reference Plane for Connector Tests..................................... 16
4.6 Whole Communication Channel evaluation ............................................................................... 17
4.6.1 General ................................................................................................................................ 17
4.6.2 Enhanced definitions for test set-up................................................................................... 17
4.6.3 Definition of Measurement Reference Plane for Tests at WCC Configurations ................. 18
5 Requirements ...................................................................................................................................... 19
5.1 Basic Requirements for Standalone Communication Channel (SCC).......................................... 20
5.1.1 Requirements for Cables (SCC) ........................................................................................... 20
5.1.2 Requirements for Connectors (SCC) ................................................................................... 22
5.1.3 Requirements for Whole Communication Channel Configuration (SCC part including
Assembly) ............................................................................................................................................ 23
5.2 Additional Requirements for Standalone Communication channel and Environment System
(ES) .................................................................................................................................................... 24
5.2.1 Requirements for Cables (ES).............................................................................................. 24
5.2.2 Requirements for Connectors (ES) ...................................................................................... 24

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5.2.3 Requirements for Whole Communication Channel Configuration (ES) .............................. 25

Annex A - Extended Test Set-up definitions ............................................................................................... 26
A.1 Example for Cable Arrangement ................................................................................................. 26
A.2 Example for Connector Text Fixture ........................................................................................... 27
Annex B – Correction Method for TDR Measurements .............................................................................. 28
Annex C – Definitions for Alien Crosstalk Setup 4 – around - 1 .................................................................. 29
C.1 Test configuration ....................................................................................................................... 29
C.2 Definition for Cable Bundle ......................................................................................................... 29
C.3 Test setup .................................................................................................................................... 29

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1 Introduction

1.1 Scope
The intention of this specification is to present the general RF requirements for a physical layer
communication channel according to Figure 1-1 to enable BroadR- Reach™ 100Mbps Technology using
unshielded twisted pair (UTP) cables for Automotive Ethernet applications. These requirements are
related to signal integrity and EMC behavior of the communication channel.

ECU
ECU 1 connector ECU 2
BR PHY / BR PHY /
Switch Switch
MDI Cable MDI
MDI interface interface MDI
network network

Inline
connector

Communication channel

Figure 1-1: Definition of communication channel

This document defines various parameters to be tested for the complete communication channel
between two Ethernet nodes and also for cables and connectors as a single part of this communication
channel. It contains test procedures, test setups and limits and shall be used as a standardized common
scale for evaluation of complete link segments and for evaluation of used types of cables and connectors.

Some functional parameters for the communication channel are required parameters as they are also
stated in [2]. All limits for other functional and EMC relevant parameters are also required, unless it is not
otherwise specified by the customer (OEM). The customer also defines the special test set-ups used to
evaluate the communication channel parameters using this test specification. A test wiring harness can
be specified by the customer for evaluation or comparison of different solutions for setting up a
communication channel configuration.

Other requirements on cables and connectors like mechanical and climatic stress depend on the
customer’s definition and are not the focus of this document.

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1.2 References
[1] IEEE 802.3: 2008, Section 2: Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
access method and Physical Layer specifications, Fast Ethernet specification

[2] Broadcom / OPEN ALLIANCE: BroadR-Reach® Physical Layer Transceiver Specification For
Automotive Applications, Version 3.2

[3] DIN EN 50173-1, Information technology – Generic cabling systems – Part 1: General
requirements

[4] DIN EN 61935-1, Testing of balanced communication cabling in accordance with ISO/IEC 11801 –
Part 1: Installed cabling (IEC 46/217A/CDV: 2007)

[5] DIN EN 50289-1-1, Communication cables, Electrical specifications for test methods

[6] ISO/IEC 11801: 2nd Edition – Information technology – Generic cabling for customer premises –
2002

[7] DIN EN 60512 – Connectors for electronic equipment – Tests and Measurement – 2002

[8] ISO/IEC 60603-7-7, Annex J

[9] IEC 61156-1: Multicore and symmetrical pair/quad cables for digital communication- part 1:
Generic specification – 2007

[10] ISO554: Standard atmospheres for conditioning and/or testing – Specifications – 1976

[11] IEC 62153-1-1: Metallic communication cables test methods Part 1-1: Electrical - Measurement
of the pulse/step return loss in the frequency domain using the Inverse Discrete Fourier
Transformation (IDFT) – 2003

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1.3 List of abbreviations and definitions

AFEXT Alien Far End Crosstalk loss

AFEXTDC Alien Far End Cross conversion loss Common to Differential

AFEXTDS Alien Far End Cross conversion loss Single ended to Differential

ANEXT Alien Near End Crosstalk loss

ANEXTDC Alien Near End Cross conversion loss Common to Differential

ANEXTDS Alien Near End Cross conversion loss Single ended to Differential

BR BroadR-Reach®

CC Communication Channel

CIDM Characteristic Impedance Differential mode

CUT Cable under Test

ECU Electronic Control Unit

ES Environment System

IL Insertion Loss

LCL Longitudinal Conversion Loss

LCTL Longitudinal Conversion Transmission Loss

PS Power Sum

PSAACRF Power Sum Attenuation to Alien Crosstalk Ration Far End

PSANEXT Power Sum Alien Near End Crosstalk loss

RL Return Loss

RT room temperature

SCC Standalone Communication Channel

S-Parameter Scattering Parameter

VNA Vector Network Analyzer

WCC Whole Communication Channel

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2 General Definitions and Requirements

All definitions for communication channel, cables and connectors are valid for any temperature, intended
to use in application and standard atmosphere condition1. In general, measurements are required at least
at the operating temperatures -40°C, 23°C and 105°C. If the communication channel is specified for a
higher operating temperature (e.g. 125°C) the maximum temperature has to be measured additionally.
Depending on defined test procedure measurements are partly reduced to 23°C ambient temperature
(RT). All measurements at communication channel, cables and connectors are required before and after
the standard mechanical and climatic stress tests according to customer requirements.

For all parts of the communication channel the RF requirements are defined in terms of the following RF
and S- Parameter:

Topic Parameter Comment

Impedance
CIDM ZRF Characteristic impedance differential mode (TDR measurement)
Single channel characteristics (port 1,2)
RL Sdd11 , Sdd22 Return Loss (differential mode)
IL Sdd21 Insertion Loss (differential mode)
LCL Sdc11 , Sdc22 Longitudinal Conversion Loss
LCTL Sdc12, Sdc21 Longitudinal Conversion Transmission Loss
Cross talk single channel and other signals (channels / port 3 to port x)
ANEXT Sdd31 , Sddx1 Alien Near End Cross Talk (pair to pair or single ended to pair)
AFEXT Sdd32 , Sddx2 Alien Far End Cross Talk (pair to pair or single ended to pair)
PSANEXT Power Sum Alien Near End Crosstalk loss
PSAACRF Power Sum Attenuation to Alien Crosstalk Ration Far End
AFEXTDC / Sdc31 , Sdcx1 Alien Near End Cross conversion loss Common to Differential
AFEXTDS Sds31 , Sdsx1 Alien Near End Cross conversion loss Single ended to Differential
AFEXTDC / Sdc32 , Sdcx2 Alien Far End Cross conversion loss Common to Differential
AFEXTDS Sds32 , Sdsx2 Alien Far End Cross conversion loss Single ended to Differential

Table 2 -1: Definitions for RF and S- Parameter

1
Standard atmosphere conditions based on ISO554-1976

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In principle the limits for S-Parameter are valid in the frequency range 1 MHz  f  66 MHz. For LCL, LCTL,
AFEXTDC, AFEXTDS, ANEXTDC and ANEXTDS limits are valid up to f = 200 MHz. The measurements should
be done up to f = 1000 MHz for information purpose.

3 Model for Communication Channel and Environment System

In this document the complete electrical wired connection between 2 ECUs with Ethernet interface is
defined as Whole Communication Channel (WCC).

ECU Inline Wiring harness / Inline ECU

connector connector cable bundle connector connector
ECU 1 ECU 2
Standalone Communication Channel
BR Cable
BR BR

Power, Power,
signals Cable other systems signals
other other
systems systems

Environment
System

Whole Communication Channel

Note: The number of inline connectors is only an example. A maximum number of 4 inline connectors is
defined for automotive application.

Figure 3-1: Model for communication channel

In opposite to general definitions of Open Alliance – in this document the wire-to-board connector
belongs to the communication channel.

The maximum length of WCC is not defined. It depends on the characteristics of each single component.
These components should be chosen to achieve a typical length of 15m and in maximum 4 inline
connectors for car applications.

To consider the electromagnetic interaction of WCC with its environment a model consisting of
Standalone Communication Channel (SCC) and an Environment System (ES) is used. This interaction can
occur as cross talk in multi-pin connectors or in multi-pair cables or between SCC cable and other cables
inside the wiring harness bundle.

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The feedback of ES to SCC can be separated into different zones:

Zone 1 Zone 2 Zone 3 Zone 4

Port 3B

Port 4B Line without noise

Port 1 Port 2 BR Channel
Port 4A Line with noise
Port 3A

Connector Wiring harness / cable bundle

Figure 3-2: Zone concept for interaction between Environment System (ES) to Standalone
Communication channel (SCC)

Table 3 -1 provides an overview on the defined coupling zones and examples for dominant disturbing
sources and related S-Parameter for each coupling zone.

Interaction / Cross talk to

Dominant disturbing source Related S-Parameter
Zone differential mode
(if present) (exemplary)
port 1 / port 2 (SCC)

Line(s) with high common mode

1 Multi-pin connector Port 3A: Sdc13A (Sds13A)
noise
Connecting area connector –
cable - untwist region outside Line(s) with high common mode
2 Port 3A: Sdc13A (Sds13A)
connector (valid for ECU noise
connector and inline connector)
Connecting area connector –
Line(s) with high common mode
3 cable - twist region outside Port 3A: Sdc13A (Sds13A)
noise
connector
Line(s) without common mode Port 3A: Sdc13A (Sds13A)
4 Cable bundle wiring harness noise and other communication Port 3B: Sdd13B
lines Port 4B: Sdd14B

Table 3 -1: Coupling zone definitions

Depending on the use configuration in real application the WCC will contain of a combination or a subset
of the defined zones.

For evaluation the WCC it should be tested as a complete system (including all zones). For analyses and
optimization or evaluation of single parts of WCC the zone can be tested separately.

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4 Test and Measurement definitions

4.1 General definitions

For all measurements a vector network analyzer (VNA) and a TDR measurement system in combination
with a test fixture with the following parameters shall be used:

Parameter Equipment Parameter Value

Type: 4- port vector network analyzer

Mixed Mode System
VNA 50 
S-Parameter impedance:
Frequency range: f = 0.3 – 1000 MHz (in minimum)
Type: 2 channel differential mode
System 50  single ended / 100  differential
impedance: mode
Characteristic Pulse generator:
Impedance TDR Test system  25 ps internal (  100 ps at test fixture)
(CIDM)
Analyzer:
Rise time:
no filter / 700 ps internally adjustable
(used digital filter characteristic of test
equipment)

Depending on the used test standard (see special definitions

All Test fixture
for cables and connectors)

Table 4 -1: Required measurement equipment

4.2 VNA measurement precautions and recommended settings

To assure a high degree of reliability for transmission measurements, the following precautions are
required (DIN EN 61935-1):

1. The reference plane of the calibration shall coincide with the measurement reference plane. In
case of differences the magnitude of errors shall be determined.
2. Consistent resistor loads shall be used for each pair throughout the test sequence.
3. The alignment of cable under test shall be chosen as defined for the single tests und must be
fixed throughout the test sequence.
4. Cable and adapter discontinuities, as caused by physical flexing, sharp bends and restraints shall
be avoided before, during and after the tests.
5. Coaxial, balanced lead and traces at the test fixture shall be kept as short as possible to minimize
resonance and parasitic effects.
6. Overload conditions of the network analyzer shall be avoided.

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To achieve high degree of comparability of test results the VNA settings given in Table 4 -2 are
recommended. The used VNA setting for each parameter of Table 4 -2 shall be documented in the test
report.

Parameter Value

Sweep fStart 300 kHz

Sweep fStop 1 GHz
Sweep type Logarithmic
Sweep points 1600
Output power minimum -10 dBm
Measurement bandwidth 100 Hz
Logic Port Impedance Differential Mode 100 
Logic Port Impedance Common Mode 200 
Data calibration kit (VNA) used kit for calibration
Averaging function 16 times
Smoothing function deactivated
Table 4 -2: Recommended VNA settings

4.3 Presentation of measurement results

Test results should be documented in the following way:

 Documentation of test conditions (e.g. humidity, temperature, cable length)

 Pictures of test set-up and test fixture
 Results for S- Parameter
o Result as dB value with related limit
o Diagram with logarithmic frequency axis up to minimal f = 1000 MHz
 Results for TDR- Measurements
o Result as differential impedance (Ohms) with related limit
o Measurement result and corrected data (according to Annex B) should be presented in
one diagram in the following format:
 Linear scale for X- axis in time
 Linear scale for additional X- axis in length (m, calculated using 2/3 of c0 or real
phase velocity of cable / connector and correction of double way of pulse
propagation)

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4.4 Cable evaluation

4.4.1 General
All required measurements are based on ISO/IEC 11801, 2nd edition.

In opposite to the definitions of ISO/IEC 11801 2nd edition, the cable to be measured should have a length
of (10 ± 0.05) m. Measurements with a standard cable length of 25m are also possible. If 10m test cable
length if not possible because of the manufacturing process, tests at a shorter cable length can be done
but must be agreed between the supplier and the customer.

The cable under test should be assembled on a conductive drum with 10mm isolation (εr ≤ 1.4). The
conduction drum is connected with ground potential of the test set-up and simulates the common mode
reference surface for the cable. The separation of each single winding of test cable should be in minimum
30mm. See Annex A - Extended Test Set-up definitions for more details.

4.4.2 Adaptation and matching

During measurement all pairs of the cable have to be matched to the characteristic impedance
(differential |Zdiff| and common mode |Zcom|). The characteristic differential mode impedance is 100 
and must be matched in any case by physical impedances. The mean common mode impedance of the
defined test setup is 200  and should be validate by a TDR measurement. It should be matched using
internal common mode correction function of VNA or using an external matching circuit for the measured
pair. In case of using an external matching circuit its attenuation have to be considered for measurement.

In case of multi pair cables, the other not measured pair(s) should be terminated using a matching circuit
as shown below:

| Z diff | nom
R1 
2
| Z diff | nom
R 2 | Z com | nom 
4
Figure 4-1: Resistor values for termination concept
The DC value of the used termination resistors has to be in a tolerance range of +/- 1 %.

The common mode termination points of all matching circuits should be connected to the ground
reference surface (conductive drum).

An appropriate test fixture according to ISO/IEC 11801 shall be used to contact the single wires of the
cable under test with the measurement equipment. The used test fixture must have low insertion loss,
high symmetry between the two different lines of a pair and very good matching to 50  single ended
impedance. The test fixture or design hints for it should be supported by the cable manufacturer.

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4.4.3 Definition of Measurement Reference Plane for Cable Tests

For evaluation of cable RF parameter the measurement reference planes are defined at the end of the
cable under test / connection point of cable with the test fixture according to Figure 4-2. The
measurement reference point can be shifted to the RF connector of the test fixture, if the electrical
characteristics of the test fixture are calibrated and corrected for measurement or have no significant
impact to measurement results.

Measurement Measurement
reference plane reference plane
PCB
PCB
direct soldering direct soldering
of cable ends of cable ends

RF RF
connector connector
(SMA) (SMA)

Test fixture Cable (CUT) Test fixture

Figure 4-2: Measurement reference planes for cables

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4.5 Connector evaluation

4.5.1 General
All required measurements for connector evaluation are based on the actual version of:

 DIN ISO - IEC 60512 Edition 25 and

 IEC 60603-7-7, Annex J

In case of multi-pin connectors (more than 2 pins) all pairs intended to use for BroadR-Reach®
communication have to be evaluated for SCC. In principle the cross talk in between these pins and all
other pins of the connector have to be evaluated (according to ES definition). It can be reduces to the
critical pins next to BroadR-Reach® pins. This reduction should be agreed between supplier and customer.

A test fixture according to IEC 60512 – chapter 25 is required. An example is given in Annex A.2. The used
test fixture must have lowest insertion loss, high symmetry between different lines of a pair and very good
matching to 50  single ended impedance. The test fixture or design hints for it should be supported by
the connector manufacturer.

4.5.2 Definition of Measurement Reference Plane for Connector Tests

For evaluation of connectors (ECU connector and inline connector) the measurement reference planes
are defined at the geometric boundary of electrical contact system of the connector according to Figure
4-3. The needed crimps for contacting the test fixture with the connector are defined as part of the
connector. The measurement reference point can be shifted to the RF connector of the test fixture if the
electrical characteristics of the test fixture are calibrated and corrected for measurement or have no
significant impact to measurement results.

Measurement reference planes

PCB Conductor PCB

Terminal

RF Crimp RF
connector connector
(SMA) (SMA)
Connector
Test fixture Test fixture
(DUT)

Figure 4-3: Measurement reference planes for connectors

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4.6 Whole Communication Channel evaluation

4.6.1 General
All required measurements for WCC evaluation should be done in accordance with test and measurement
definitions for cables and connectors. For complete evaluation all parts of the intended application shall
be included into the test set-up. The untwisted area at the connectors must be configured as in the same
manner as possible for mass production. All potential interactions between SCC and ES according to Table
3 -1 should be included into the test setup. If the WCC configuration consists of more than one SCCs, all
SCCs have to be evaluated separately. In this case the second (others) SCC(s) is part of ES from first SCC
point of view.

Test at WCC configuration are required only for 23°C ambient temperature (RT).

Comment:
Due to technical limitation for climatic chambers tests of Whole Communication Channel configuration are
not required for high or low temperatures. Cables and connectors can have temperature depending
characteristics and will be tested.

Because of required measurements only at RT and possible temperature dependent value for IL of the
used cable the measurement result for IL must be corrected for fixed frequencies f = 1, 10, 16, 33 and
66 MHz in the following way:

𝐼𝐿𝑊𝐶𝐶_ max 𝑡𝑒𝑚𝑝 = 𝐼𝐿𝑊𝐶𝐶_𝑅𝑇 + (𝐼𝐿𝐶𝑎𝑏𝑙𝑒_ max 𝑡𝑒𝑚𝑝/𝑚 − 𝐼𝐿𝐶𝑎𝑏𝑙𝑒_𝑅𝑇/𝑚 ) ∗ 𝑙

with: ILWCC_max temp Value Insertion Loss for measured WCC configuration at maximum temperature
ILWCC_RT Value Insertion Loss for measured WCC configuration at RT
ILcable_max temp/m Value Insertion Loss per meter for measured cable at maximum temperature
ILcable_RT/m Value Insertion Loss per meter for measured cable at RT
l length of measured WCC configuration

4.6.2 Enhanced definitions for test set-up

All parts of evaluated WCC configuration should be placed on a (10 ± 0.5) mm isolation support (εr ≤ 1.4)
over an enlarged ground reference plane (minimum 1x2 m). The ground reference plane should overlap
all parts of the test configuration with in minimum 30mm (3 times height over reference ground plane).
In general the distance between all parts of the evaluated communication channel should be also in
minimum 30mm (3 times height over reference ground plane). For small configurations the cables should
be route in a straight way. For large configurations the cable segments should be arranged as a meander
between the connectors to avoid parasitic couplings at test setup. Take care that the minimum blending
radius doesn’t go below the minimum value for used cable type. The orientation of ECU and Inline
connectors should be in main orientation that means horizontal to ground plane. The ground reference
of the used test fixtures shall be low-impedance connected to the ground reference plane.

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min. 2 x 1m
Ground plane

ECU Inline Inline Isolation

connector connectors connector support
Cable to
VNA / TDR

Port 1
Test min.
30mm
fixture

Port 2
Cable to
VNA / TDR
ECU Inline min.
GND 30mm
connection
connector connector
test fixture min. 30mm

Figure 4-4: Example for test set-up for WCC evaluation

4.6.3 Definition of Measurement Reference Plane for Tests at WCC Configurations

For evaluation of the WCC configuration the measurement reference planes are defined at the geometric
boundary of the electrical contact system of the ECU connector at both sides of the channel. See Figure
4-3 and Figure 4-5 for more details. An appropriate test fixture for connectors shall be used to contact the
ports of the WCC configuration with the measurement equipment.

Measurement Measurement
reference plane reference plane

ECU Inline Wiring harness / Inline ECU

connector connector cable bundle connector connector

BR BR

Power, Power,
signals signals
other other
systems systems

ECU 1 ECU 2

Whole Communication Channel

Figure 4-5: Measurement reference planes for WCC evaluation

For analysis of single parts of the communication channel (e.g. inline connector with corresponding
untwisted area and cable) the measurement reference planes have to be adapted.

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5 Requirements
Depending on implementation of BroadR- Reach™ 100Mbps physical layer communication channel
different requirements are specified. The requirements on SCC are basic requirements in any case. If the
Environment System (ES) have to be taken into account for evaluated implementation, the additional
requirements for ES are valid, too.

For evaluation of the complete channel implementation the requirements for WCC must be used. To be
able to setup a compliant BroadR- Reach™ 100Mbps channel implementation cables and connectors
should be used, that fulfill the respective requirements.

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5.1 Basic Requirements for Standalone Communication Channel (SCC)

5.1.1 Requirements for Cables (SCC)
For evaluation of twisted pair cable, intended to use for standalone communication Channel (SCC), test
parameter and limits are required according to Table 5 -1. Depending on the maximum length of the SCC
different limits are required for IL. All other limits are independent of SCC length.

Limit
Test parameter Test standard
(max. value for parameter)

100 Ω +/- 10 %, valid for 700 ps

CIDM ZRF IEC 62153-1-1 rise time evaluation )3
Evaluation window: l = 0.5m to 1.5m, see )4

Maximum length of SCC = 15m:

1 MHz: 0.06 dB/m
10 MHz: 0,16 dB/m
33 MHz: 0.31 dB/m
66 MHz: 0.45 dB/m
IL )5 Sdd21 )2
Maximum length of SCC = 10m:
1 MHz: 0.09 dB/m
ISO/IEC 11801 10 MHz: 0,24 dB/m
DIN EN 50289-1-1 33 MHz: 0.46 dB/m
66 MHz: 0.68 dB/m
1 MHz: 20.0 dB
RL Sdd11 , Sdd22 )1 20 MHz: 20.0 dB
66 MHz: 14.8 dB

LCL Sdc11 , Sdc22 )1 1 MHz: 46.0 dB

50 MHz: 46.0 dB
LCTL Sdc21 , Sdc12 )1 200 MHz: 34.0 dB
)1 linear axis for dB, linear interpolation for limit value at logarithmic frequency axis
)2 logarithmic axis for dB, linear interpolation for limit value at logarithmic frequency axis
)3 two measurements are required: systems rise time  25 ps for information purpose only, systems rise time
700 ps for limit comparison
)4 refer to Figure 5-1 for evaluation window definition
)5 for IL limits for cables, two classes of cable are specified, depending on maximum length of implemented
SCC
Table 5 -1: Required parameter and limits for cables (SCC)

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Evaluation window

l=0m l=0.5m l=1.5m

Figure 5-1: Example for TDR measurement with definition of evaluation window for CIDM limit at
cables

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5.1.2 Requirements for Connectors (SCC)

For evaluation of two pin connectors, intended to use for standalone communication Channel (SCC), test
parameter and limits are required according to Table 5 -2.

Limit
Test parameter Test standard
(max. value for parameter)

Intra Pair Skew tintra_pair_x IEC 60512-25-4 Only for information )3

100 Ω +/- 10 %, valid for 700 ps
CIDM ZRF IEC 60512-25-7
rise time evaluation )4
1 MHz: 0.025 dB
10 MHz: 0,038 dB
IL Sdd21 )2 IEC 60512-25-2
33 MHz: 0.050 dB
66 MHz: 0.075 dB
1 MHz: 38.0 dB
RL Sdd11 , Sdd22 )1 IEC 60512-25-5 33 MHz: 38.0 dB
66 MHz: 30.5 dB
1 MHz: 46.0 dB
LCL Sdc11 , Sdc22 )1
IEC 60603-7-7,Annex J 50 MHz: 46.0 dB
LCTL Sdc21 , Sdc12 )1 200 MHz: 34.0 dB
)1 linear axis for dB, linear interpolation for limit value at logarithmic frequency axis
)2 logarithmic axis for dB, linear interpolation for limit value at logarithmic frequency axis
)3 no limit applied, measurement result can be used for compensation of connector propagation delay skew at
the layout of the ECU, if needed
)4 two measurements are required: systems rise time  25 ps for information purpose only, systems rise time
700 ps for limit comparison
Table 5 -2: Required parameter and limits for connectors (SCC)

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5.1.3 Requirements for Whole Communication Channel Configuration (SCC part including
Assembly)
For evaluation of complete WCC implementation, intended to use for Standalone Communication
Channel (SCC), parameter and limits are required according to Table 5 -3.

Limit
Test parameter Test standard
(max. value for parameter)

100 Ω +/- 10 %, valid for 700 ps

CIDM ZRF IEC 62153-1-1
rise time evaluation )3, )4
1 MHz: 1.0 dB
10 MHz: 2.6 dB
IL )5 Sdd21 )1
33 MHz: 4.9 dB
66 MHz: 7.2 dB

ISO/IEC 11801 1 MHz: 18.0 dB

RL Sdd11 , Sdd22 )2 20 MHz: 18.0 dB
DIN EN 50289-1-1 66 MHz: 12.8 dB
1 MHz: 43.0 dB
LCL Sdc11 , Sdc22 )2 33 MHz: 43.0 dB
LCTL Sdc21 , Sdc12 )2 50 MHz: 39.4 dB
200 MHz: 27.3 dB
)1 logarithmic axis for dB, linear interpolation for limit value at logarithmic frequency axis
)2 linear axis for dB, linear interpolation for limit value at logarithmic frequency axis
)3 Two measurements are required: systems rise time  25 ps for information purpose only, systems rise time
700 ps for limit comparison.
)4 For long channels the TDR measurement technique may lead to incorrect measuring results. To prevent
getting faulty results either software based solutions of the TDR measurement device or the correction
procedure given in Annex B – Correction Method for TDR Measurements should be used.
The limit is valid for CIDMcorrected (t). Both results for CIDMmeasured (t) and CIMDcorrected (t) must be given in the
resulting diagram.
)5 Because of measurement at RT and possible temperature dependent IL value for used cable the limit is valid
for the corrected measurement result according to section 4.6 of this document.
Table 5 -3: Required parameter and limits for whole channel (SCC)

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5.2 Additional Requirements for Standalone Communication channel and

Environment System (ES)
5.2.1 Requirements for Cables (ES)
Actually there are no requirement defined in this section.

5.2.2 Requirements for Connectors (ES)

For multi-pair connector evaluation, additionally to section 5.1.2 test parameter and limits are required
according to Table 5 -4.

Limit
Test parameter )1 Test standard
(max. value for parameter)

1 MHz: 70.4 dB
16 MHz: 46.3 dB
ANEXT/AFEXT Sdd31, Sddx1, Sdd32, Sddx2 IEC 60512-25-1
33 MHz: 40.0 dB
66 MHz: 34.0 dB

Cross Talk Mode 1 MHz: 46.0 dB

Conversion Sdc31, Sdcx1, Sds31, Sdsx1 50 MHz: 46.0 dB
IEC 60603-7-7
ANEXTDC/ANEXTDS Sdc32, Sdcx2, Sds32, Sdsx2 100 MHz: 40.0 dB
AFEXTDC/AFEXTDS 200 MHz: 34.0 dB

)1 linear axis for dB, linear interpolation for limit value at logarithmic frequency axis
Table 5 -4: Additional required parameter and limits for connectors (ES)

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5.2.3 Requirements for Whole Communication Channel Configuration (ES)

For evaluation of complete WCC implementation, additionally to section 5.1.3 parameter and limits are
required according to Table 5 -5.

Limit
Test parameter )1 Test standard
(max. value for parameter)

1MHz: 51.5dB
PSANEXT )2
ISO/IEC 11801 100MHz: 31.5dB
DIN EN 50289-1-1 1MHz: 56.5dB
PSAACRF )2
100MHz: 16.5dB
Cross Talk Mode 1 MHz: 43.0 dB
Conversion Sdc31, Sdcx1, Sds31, Sdsx1 33 MHz: 43.0 dB
ANEXTDC/ANEXTDS Sdc32, Sdcx2, Sds32, Sdsx2 50 MHz: 39.4 dB
AFEXTDC/AFEXTDS 200 MHz: 27.3 dB

)1 linear axis for dB, linear interpolation for limit value at logarithmic frequency axis
)2 This limit is valid for any WCC implementation related to this document.
For comparison purpose of WCC implementation with specific cables and connector types a 4 – around 1
test setup according to Annex C – can be used.
Table 5 -5: Additional required parameter and limits for Whole Communication Channel
configuration (ES)

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Annex A - Extended Test Set-up definitions

A.1 Example for Cable Arrangement

The cable under test should be loose wound on a metallic drum with b = 10mm isolation (εr ≤ 1.4) at drum
outside. A loose winding of the CUT is required to avoid a mechanical impact to the cable during the test
at low and high temperatures. Each winding should be separated by a minimum of a = 30mm which will
eliminate inter-winding coupling for unscreened cables. The ground reference of the used test fixture for
connecting the cable under test with the measurement equipment is low impedant shorted to the metallic
drum at both ends.

The distance of windings at the drum arrangement is calculated as follows:

𝑎 =3∗𝑏

with: a distance between single windings of CUT

b thickness of isolation (equal to height above ground reference plane) = 10mm

An example for drum with loose wound unscreened cable is given in Figure A-1.

Test fixture
Metallic drum

Isolation
thickness
b = (10+/-0.5) mm

CUT
(loose winding) Coax cable to VNA

CUT interwinding
distance
(min. a = 30mm)

Figure A-1: Example for cable arrangement used for S- Parameter and TDR measurements

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A.2 Example for Connector Text Fixture

The connector test fixture must provide an optimal connection of connector terminals with the
measurement equipment. In order to avoid parasitic effects at the test fixture a printed circuit board
should be used with impedance controlled traces (which should be as short as possible) and RF board
connectors. An example for connector test fixture is given in Figure A-2.

Figure A-2: Example for test fixture for connector evaluation, left top layer, right 3-D picture of
connector and two test fixtures

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Annex B – Correction Method for TDR Measurements

For long channels the TDR measurement technique may lead to incorrect measuring results. To prevent
getting fault results the following correction procedure should be used:
a) TDR measurement from both sides of the investigated channel using system rise time 700 ps
b) If the measured CIDM value increases with a linear slope over length for both particular
measurements the correction given below is applicable, otherwise the correction is not allowed.
I. Calculation of slope of measured CIDM function over time at the region of cable:
S (t,CIDMmeasured(t))
Note: The impedance of test fixture and ECU connector must be out of focus for this
calculation. Possible calculation method: EXCEL function “Slope” or comparable
functions at other software tools
II. Correct slope
CIDM1(t) = CIDMmeasured(t) – S * t
III. Getting offset O at the beginning of channel (t = tDUT0)
O = CIDMmeasured (tDUT0) - CIDM1(tDUT0)
Note: Needed to avoid correction of slope in measurement cables used for connection
the TDR measuring equipment with the test fixture
IV. Correct offset
CIDMcorrected (t) = CIDM1(t) + O
The limit is valid for CIDMcorrected (t). Both results for CIDMmeasured (t) and CIDMcorrected (t) must be given in
the resulting diagram. An Example of correction results is given in Figure B-1.

Figure B-1: Example for correction of TDR measurement results for long communication channels

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Annex C – Definitions for Alien Crosstalk Setup 4 – around - 1

C.1 Test configuration

The test configuration consists of uncoiled five link segments as shown in Figure C-1. Multiport test
fixtures shall be used for multiport link segments.

Figure C-1: Test configuration for Alien crosstalk measurements at a 4 – around – 1 link
arrangement

C.2 Definition for Cable Bundle

The cable bundle shall be placed on dielectric insulation material (εr ≤1.4) of at (10 +/- 0.1) mm height
over conducting ground plane. The cables have to be placed within the alien crosstalk test configuration
in a 4 – around - 1 configuration as shown in Figure C-2. The cables should be fixed in their position by
means of cable straps or adhesive tape to keep the cables attached together with a maximum distance
between the fixation devices of 30 cm. Cable 2 is defined as victim pair for power sum analysis.

Figure C-2: Cross section of cable bundle

C.3 Test setup

In general the WCC test setup according to Figure 4-4 should be used. The 4 – around - 1 cable bundle
should be placed on the (10 +/-0.1) mm isolation support. If it is necessary to split up the wiring harness
at the end of the bundle in order to accommodate the measurement fixtures, the length of the area split

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up is limited to maximum of 30 cm. Unused wires of the UTP cable have to be terminated with a single
ended impedance of 50 Ω. The measurement fixtures have to be connected to the reference ground plane
by means of conducting stands, copper-braid or –foil.

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