InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
InfiniBand Trade Association
Revision 1.6
03/27/2014
Tektronix Active Time Domain
Method of Implementation:
FDR Active Cables
Credit 20’th Century Fox 1974, adaptation of Mary Shelley's novel Frankenstein
“Young Frankenstein” from which the concept of MOI’s was derived.
This material is provided for reference only. The InfiniBand Trade Association does not endorse the
vendor’s equipment outlined in this document.
This document is provided "AS IS" and without any warranty of any kind, including, without limitation,
any express or implied warranty of non-infringement, merchantability or fitness for a particular purpose.
In no event shall IBTA or any member of IBTA be liable for any direct, indirect, special, exemplary,
punitive, or consequential damages, including, without limitation, lost profits, even if advised of the
possibility of such damages
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InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
Table of Contents
Glossary ............................................................................................................................................................3
References:............................................................................................................................................................................... 4
Equipment List.......................................................................................................................................................................... 4
NOTE : Reference Appendix 6 for specific guidance on measurement windows for allowable in this setup and calibration
process. .................................................................................................................................................................................... 5
Quick Overview of Fixture Calibration and DUT testing .......................................................................................................... 5
Divider Networks...................................................................................................................................................................... 6
TEKTRONIX 72004 Real-Time Oscilloscope DPOJet Setup Files ............................................................................................... 6
TEKTRONIX DSA8300 Equivalent-Time Oscilloscope Setup Files ............................................................................................. 6
Voltage Range Setting for FDR AOC Assemblies Using Mellanox-Diolan I2C-Bridge ............................................................... 8
STEP-1 - Calibrate the Counter-Propagating (output) Aggressor Signals Required for Victim Stressed-Eye-Calibration........ 8
STEP-2 - Co-Propagating Cross-talk (FEXT) Calibration ............................................................................................................ 8
STEP-3 - Victim Stressed-Eye Calibration ................................................................................................................................. 9
STEP 4 - Calibrating the Counter-Propagating (Input) Aggressors (NEXT) On MCB-2.............................................................. 9
Step 5 - DUT Testing ................................................................................................................................................................. 9
Appendix 1: Tables of QDR and FDR IBTA Victim Specifications............................................................................................ 14
Appendix 2: Tables of QDR and FDR IBTA Aggressor Parameters ......................................................................................... 15
Appendix 3: Tables of FDR Settings used at Plug-Fest-22 ...................................................................................................... 16
Appendix 4: Table of FDR Victim Measurements taken at IBTA Plug-Fest-22 October 2012 ................................................ 17
Appendix 6: Allowable Spec and Measurement value margins. ............................................................................................ 19
Appendix 8: Diagram at Active Optical Time Domain DUT Test Fixture ................................................................................ 20
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InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
Glossary
This section provides definitions of the terminology used throughout this document. The reference diagram in Figure 1 is a considerably
simplified representation of the ATD test system presented in this document, illustrating the terms defined in the glossary.
Active-Optical Cable assembly. Cable assemblies that use fiber–optic transceivers and fiber-optic
interconnects to transmit high-speed serial data such as InfiniBand and Ethernet.
Active Time-Domain testing. A test methodology for active-cable-assemblies, (primarily Active Cable) where
time-domain parameters such as jitter, eye-height and eye-width are measured on a stressed victim signal.
The phenomena of a signal transmitted on one channel coupling energy onto an adjacent channel, causing an
undesirable effect.
Adjacent channels which generate crosstalk energy and are driven from the input side of the test system and
propagate in the same direction as the victim channel.
Adjacent channels which are driven from the output side of the test system, propagating in the opposite
direction as the victim channel, and imposing crosstalk energy onto the victim channel at the output side of the
ATD test system.
Adjacent channels which are driven from the output side of the test system, propagating in the opposite
direction as the victim channel, and imposing crosstalk energy onto the victim channel at the input side of the
ATD test system.
Far-End Cross-Talk. Cross-Talk which occurs at the Far-End of a link. In ATD testing, the location of the FarEnd is defined with respect to where the victim measurement is performed. FEXT will normally occur at the
input of the ATD test system.
AOC
ATD
Cross-Talk
Co-Propagating
Input Aggressors
Counter-Propagating
Output Aggressors
Counter-Propagating
Input Aggressors
FEXT
Host Compliance Board. PCB board or interface with known signal integrity characteristics that allow testing
of host or switch specifications. The HCB is used for calibrating signals in the ATD test system. (HCB not
illustrated below)
Module Compliance board. PCB board or interface with known signal integrity characteristics which allows
testing of “modules” such as QSFP cable assemblies.
Near-End Cross-Talk. Cross-Talk which occurs at the Near-End of a link. In ATD testing, the location of the
Near-End is defined with respect to where the victim measurement is performed. NEXT will normally occur
at the output of the ATD test system.
Pulse Pattern Generator. Signal generator used to generate pseudo random binary data for traffic.
HCB
MCB
NEXT
PPG
ATD TEST SYSTEM
Co-propagating aggressors
ATD INPUT
TERMINATE
Victim
Tx1
Rx1
Tx2
Rx2
Tx3
Rx3
Tx4
Rx4
Rx1
Tx1
Rx2
Tx2
Rx3
Tx3
Rx4
Tx4
Counter-propagating
Input Aggressors
MCB-1
MCB-2
Active Cable / DUT
Victim
SCOPE
Victim
Measurement
PPG
Counter- Propagating
Aggressor Source
Counter-propagating
Output Aggressors
Figure 1. Glossary Reference Diagram
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ATD OUTPUT
PPG
Victim
Source
NEXT
TERMINATE
PPG
Co-Propagating
Aggressor Source
FEXT
InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
References:
IBTA Volume 2 Physical Specification Draft – November 6th 2012
Equipment List








Tektronix PPG3002 – 30Gbps two channel Pulse Pattern Generator
Tektronix PPG3001 or BSA286CL - 30Gbps 1 channel Pulse Pattern Generator, or a BSA286CL 28.6G
BERTScope in cases where BER performance measurements are required.
Tektronix LE320 – 32Gbps Linear 9 Tap Equalizer
Tektronix DSA 72004 – Real-Time Digital Signal Analyzer 20GHz Oscilloscope (Used for SDR, DDR,
QDR Speeds)
Tektronix DSA8300 – Equivalent-Time Digital Signal Analyzer (Used at QDR, FDR and EDR Speeds)
Tektronix 80E10B – 50 GHz sampling Head
Tektronix 82A04B – 30 GHz phase reference
Tektronix CR286A – (Option HS, 80A08 Cabling & Splitters) if retiming occurs within AOC.

Molex zQSFP+ 25Gbps Test Board (MCB) Qty 2 – PN: PCB-111114-3020-REVA – Molex Host
Compliance Board

Molex MCB requires 12 short <1ps phase matched cable pairs 6” in length to extend to power combiners.
Tek part number 174636200 or equivalent.
-orWilder TF-QSFP+-TPA100G-HCB-P: Qty 2 – QSFP+ Test Point Adaptor, Host Compliance Board Plug
Wilder TF-QSFP+-TPA100G-MCB-R: QSFP+ Test Point Adaptor, Module Compliance Board
Receptacle
Wilder MCB will require 12 male to male SMA interconnects to adapt the power splitter female to
Wilder MCB female cables.







SMA Interconnect Cables: Qty8 – Specified to a bandwidth of at least 18Ghz (25GHz Preferred); Phased
matched pairs to +/- 2pS
Picosecond Pulse Labs 5334-135(FDR Speeds) or 5334-257 (EDR Speeds): Qty 4 – 5 Way Power
Splitters.
Mellanox/Diolan I2C-Bridge –I2C to USB Adaptor Dongle
PC Running Windows – Used to control the I2C-Bridge device
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InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
NOTE : Reference Appendix 6 for specific guidance on allowable measurement windows.
Quick Overview of Fixture Calibration and DUT testing



NOTE: This setup assumes TX4 is the victim
o Any of the lanes could be tested as victims, and if this kind of testing was really done thoroughly
each of the four victim lanes would be tested in turn. At IBTA Plug-Fest events there is only time to
test one of the lanes as an audit. Other lanes could be selected as the victim for the audit on a case
by case basis.
Quick Overview of calibration steps:
o Set up connections to Tektronix test equipment
 Refer to Figure-2 or Figure-5 Victim and Co-Propagating Crosstalk (FEXT) Calibration Block Diagram
 Use MCB -HCB mated pair
 Divider networks are used for the FEXT and NEXT aggressors
 Load the proper Tektronix 80SJNB setup file for the victim stressed eye testing
 FDR uses a hexagonal mask
 QDR uses a diamond max
o Initial rough calibration of Victim stressed-eye y to set amplitude and emphasis tuning
 The victim signal should be roughly setup before FEXT and NEXT aggressors are calibrated
 The Tektronix PPG3002 and the LE320 emphasis unit should be tuned to output a rough
approximation of the amplitude and emphasis required for
 The victim eye should be initially measured at the TEK DSA8300 using 80SJNB SW
o Calibration of FEXT aggressors
 Refer to Figure-2 Victim and Co-Propagating Crosstalk (FEXT) Calibration – Block
Diagram
 The FEXT aggressors are measured at TP6A using the TEK DSA8300
o Calibration of NEXT aggressor
 Refer to Figure-3 Counter Propagating (NEXT Calibration) – Block Diagram
 Use MCB –HCB mated pair
 The NEXT aggressor are measured at TP6A using the TEK DSA8300
o Calibration of Vitim with properly calibrated FEXT and NEXT aggressors
 It will likely take a few tuning trials until all victim stressed eye specifications are met
 Adjust the amplitude and emphasis of the victim to meet victim eye-mask and jitter specs
 The settings on the jitter generator will need to modified as required
 The Final measurements of the victim should be recorded
 A 80SJNB report should be generated and saved
Quick Overview of DUT Testing: Refer to Figure 1 which is a diagram named: “Limiting Active – TimeDomain Testing – DUT Testing – Block Diagram”
o Figure-1 shows the complete setup for DUT testing
o All Calibration steps for the victim, NEXT aggressors and FEXT aggressors need to be completed
before DUT testing can proceed
o The victim input signals and the co-propagating (FEXT) aggressors are connected to MCB-1
o Counter-propagating (NEXT) Crosstalk are connected to the Tx connectors of MCB-2
o The stressed eye Victim measurements are taken off MCB-2 using a Tektronix DSA8300
Equivalent Time Oscilloscope for QDR, FDR and EDR speeds.
o A 80SJNB automated routine measures all the appropriate parameters
o Results are collected and a report is generated from the 80SJNB tool.
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Active Time Domain Testing for FDR Cables
Divider Networks




Power Divider networks that split a signal coming from the PPG into multiple signals. This allows two
PPG units to drive all the aggressor signals required for testing
There are obvious pros and cons of using divider networks, for testing
o Divider networks are primarily used to limit the number of PPG units required for testing
o It is desirable to have more PPG units for added flexibility of aggressor signal generation
Please note in the setup diagrams, that the second PPG unit used to drive the NEXT aggressors is set to a
slightly lower data rate of 14.0Gbps, compared to 14.0625 for the victim and FEXT aggressors.
o This is to make the NEXT aggressors out of phase with the victim input signal
Also note that the signal ended “P” and N” pairs for the NEXT and FEXT signals should be alternated so
that lanes are 180º out of phase with each other
TEKTRONIX 72004 Real-Time Oscilloscope DPOJet Setup Files


Tektronix DPOJet setup files have been created or both FDR and QDR ATD testing
o These setup files are controlled by the IBTA and the IOL
Any setup files that are used should be verified that they are using parameters from the latest IBTA
specification
TEKTRONIX DSA8300 Equivalent-Time Oscilloscope Setup Files


Tektronix DSA8300 setup files which contain the QDR, FDR and EDR Mask geometries can be
downloaded here.
https://danahertm.box.com/s/e63icjum1eg2qhpgdt0u
These Masks should be imported into the DSA8300 as follows:
Note: (To be incorporated into setup file at some future date)
Ensure sampling density is set to 1000
Waveforms to be accrued before stop should be set to 2000
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Active Time Domain Testing for FDR Cables
In this configuration, the display shows 2 UI’s of data. Only the center UI is measured against the mask.
This means 1000 samples * 2000 accrued waveforms / 2UI which offers 5.0E-5 mask certainty with 50 hits
maximum.
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Active Time Domain Testing for FDR Cables
Voltage Range Setting for FDR AOC Assemblies Using Mellanox-Diolan I2C-Bridge
NOTE: Please refer to the IBTA specification for full information on range settings for FDR AOC assemblies.
 The range setting on FDR AOC assemblies needs to be set at both DUT plug-ends
o Range settings in FDR AOC assemblies are a non-sticky setting in the AOC QSFP memory map
 Range settings are accessed on Page-3 bytes 238 and 239 (0xEE and 0xFF)
 The IBTA / IOL uses the Mellanox-Diolan I2C-Bridge USB to I2C dongle to program the proper bytes
o A PC is used to control the Diolan I2C-Bridge device
o PLEASE see the Appendix for “bat” files that have been created to program range settings
o DUT “Plug-2” is connected to MCB-2 where the O-scope measurement is made
 The DUT measurement must be made with Range-0 set
 Bytes 238 and 239 should be set to “zero”
o DUT “Plug-1” is connected to MCB-1, where the victim signal is driven
 Plug-1 should be set to Range-0, to emulate the worst case cross-talk environment
 Bytes 238 and 239 should be set to “zero”
STEP-1 - Calibrate the Counter-Propagating (output) Aggressor Signals Required for Victim
Stressed-Eye-Calibration

Please refer to Figure-2: diagram titled: “Victim and Co-Propagating Crosstalk (FEXT)
Calibration - Block Diagram”
o Connect the HCB to MCB-1 to form a mated pair
o Connect the counter-propagating Crosstalk (NEXT) sources from the divider network driven by
Tektronix PPG3002 CH2 to the HCB-RX SMA connectors (Rx1P,
RX1N,RX2P,RX2N,RX3P,RX3N,RX4P,RX4N)
o Measure the Counter-propagating (output) NEXT aggressor signals on the MCB-1 at TP7a RxSMA Connectors - Rx1P, RX1N,RX2P,RX2N,RX3P,RX3N,RX4P,RX4N)
Changed the cross-talk source settings on the PPG as required to meet the specified limits
amplitude and rise and fall transition time limits
o Please see Ampendix-2 for target value for amplitude and transition times of the NEXT outputaggressors
Note: These aggressors emulate the counter-propagating signals at the output of the cable
DUT which will be set to amplitude range 0
o For FDR The measured r/f transition time at MCB-1 TP7A should measure 17ps at each test pointMeasured with a 17GHz low-pass filter
STEP-2 - Co-Propagating Cross-talk (FEXT) Calibration

Start with same mated pair setup from Step-1; with the now calibrated counter-propagating Cross-talk
source
o Terminate the MCB-1 the eight RX SMA connectors with 50-ohm loads (Rx1P,
RX1N,RX2P,RX2N,RX3P,RX3N,RX4P,RX4N)
o Plug the Victim generating source into the selected victim TX lane of MCB-1: Tx4P and TX4P
 We will calibrate the victim in Step 3; For now leave the victim to work on the three other copropagating cross-talk lanes
o Connect the Co-Propagating Cross-talk (FEXT) sources from the divider network driven by Tektronix
PPG3001 CH-1 into MCB-1 on into the non-victim” Tx lines: TX1P,TX1N, TX2P, TX2N,
TX3P,TX3N
 Turn on the crosstalk source generator
o One by one, measure the six Co-propagating cross-talk signals at TP6A of the HCB: TX1P,TX1N,
Tx2P,Tx2N,TX3P,TX3N,
 Changed the cross-talk source settings as required to meet the specified limits
o Please refer to Appendix-2 for target value for amplitude and transition times of the FEXT Input
signals
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Active Time Domain Testing for FDR Cables
o The rise /fall transition time at TP6A should be measured with a 17GHz low-pass filter
o After each crosstalk signal is successfully measured to spec limits, terminate the SMA connectors
with 50-ohm loads
STEP-3 - Victim Stressed-Eye Calibration

Start with same mated pair setup from Step 2, with all of the cross-talk sources calibrated and terminated
in the correct places
o Verify that the Victim source generator is connected and is set up to reasonable starting settings (for
instance the settings from PF-21 are a good starting point)
o Connect the Victim output on the HCB TX4P, TX4N to a TEK DSA8300 equivalent time
oscilloscope with 80SJNB80SJNB based Jitter and eye-mask measurement tools
 Load the 80SJNB setup configured for ATD Victim calibration found here.
https://danahertm.box.com/s/c4nt3xiwz3bdihjm8w6u
o Measure the eye-mask, jitter and DDPWS parameters
 Modify the amplitude, emphasis and jitter sources to meet the victim input specs in the
presence of Far-end and near-end crosstalk; It will most likely take several trial before the
specifications are met
o Please see Appendix--1 Victim-Input Specifications for the target parameters of the Stressed-eye
Victim Measurements in the presence of FEXT and NEXT crosstalk should
STEP 4 - Calibrating the Counter-Propagating (Input) Aggressors (NEXT) On MCB-2

Please Refer to Figures-3 and 6: Limiting Active – Time-Domain Testing – Counter Propagating
(NEXT Calibration) - Block Diagram (Tektronix configured generators)
NOTE: The signals for the NEXT aggressors are driven by a second PPG in Frame-B. The PPG-2 for these
signals uses a second synthesizer clock that is set to 14.0GHz; Slightly out of phase with PPG-1. (See Figure3)
o Disconnect HCB from MCB-1
o Remove the crosstalk sources from RX lines on HCB
o Connect the HCB to MCB-2 to form a mated pair
o Connect the “counter-propagating” cross-talk sources to the TX SMA connectors on MCB-2 TP5a:
TX1P, TX1N, TX2P, TX2N, TX3P,TX3N,TX4P,TX4N
o Turn on the Counter propagating Cross-talk source generator Tektronix PPG 3002 (Figure 3)
 Note the input clock to the Pattern generator is intentionally set to 14.0GHz
 The data rate of the counter propagating PPG will slightly offset form the standard data rate of
14.1Gbps to help create a worst case aggressor source
o Measure the (input) counter-propagating signals at the HCB TP6A: TX1P, TX1N, TX2P, TX2N,
TX3P,TX3N,TX4P,TX4N
o Please see Apendix-2 for the amplitude and transition time parameters to be measured at TP6A
 Note: These aggressors emulate the counter-propagating signals generated by the switch (or
host) to the input of the cable
o The measured r/f transition time at TP6A measured with a 17GHz low-pass filter
o After each crosstalk signal is successfully measured to spec limits, terminate the SMA connectors
with 50-ohm loads
o Disconnect the HCB from MCB-2
Step 5 - DUT Testing

All calibration steps must be completed before DUT testing can commence
o Figure-1 shows the complete setup for DUT testing
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InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
o Connect Plug-1 of the DUT cable into MCB-1 that has victim and aggressors calibrated using step-2
above
o Connect Plug-2 of the DUT cable into MCB-2 that has the counter-propagating aggressors
(NEXT) calibrated using Step-4 above
o Run the proper I2C-USB Bridge commands to set Plug-2 in MCB-2 to range-0 for DUT testing
 Plug-1 in MCB-1 should be set to Range-1
o Connected the TEK DSA8300 equivalent time Oscilloscope to the MCB-2 victim lane (RX4P,
RX4N)
o Load the proper TEK 80SJNB and Mask setup files for FDR Limiting Active Cable Testing
o Run TEK 80SJNB80SJNB and Measure the victim to IBTA Specifications:
 Eye-mask hit ratio test set at Tx amplitude Range-0
o Record measured values in proper DUT spreadsheet
o Perform a print to file operation on 80SJNB to capture a full report for this DUT.80SJNB
o NOTE: It is recommended that the DSA8300 Bandwidth be limited (Setup->Vertical Menu) to
20GHz for QDR, 30GHz for FDR and 60GHz for EDR speeds.
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InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
Limiting Active – Time-Domain Testing - DUT Testing - Block Diagram
Primary Reference: IBTA Volume 2 Physical Specification Release – November 6th 2012
FDR -- Range-1
TP7a
Rx2
Rx1
Data
Victim
D, D_N
Data
CH2
(14.0625)
C2 Jitter Impairments
(Not Used)
D, D_N
Co-Propagating
Aggressors
QSFP PCB
Connector
(FEXT)
(Diff Pairs) TP5a
Divider Network
X2
Tx1
D, D_N
Co-propagating
Aggressors
(FEXT)
I2C-Clk
/
Tx2
FDR -- Range-0 Data
Rx1-Rx4 50-Ohm
Terminated
MCB-1
Tx2
D, D_N
Tx3
D, D_N
TP7a
Rx1 TP6A Rx2
Rx4
QSFP PCB
Connector
DUT
DUT
Plug-2
DUT
Plug-1
DUT –Limiting
Active Cable
Assembly
Victim Calibration
Measurement point
MCB-2
HCB – Rev3 –
Counter-Propagating
Aggressors
(NEXT)
(Diff Pairs)
(Diff Pairs) TP5a
TP8a
Rx4
Tx1 Rx2Tx2
Tx4
Rx1
Tx3
Rx3
Counter- D, D_N
propagating
(input) Aggressors
PN: PHY-SI QSFP28
P and N outputs of the
NEXT and FEXT divider
networks should plugged
in 180-degees out of
phase with each other
SMA cables used ideally
should be rated for 26GHz, (NEXT)
low loss, phased matched,
18-inches
P and N outputs of the NEXT
and FEXT divider networks
should plugged in 180-degees
out of phase with each other
Divider Network
X2
Power Dividers are 5 way resistive couplers Tektronix part
number 174-6214-00. Required 4 units.
2.92 Cables are 16 pairs of Tektronix part number
PMCABLE1M (phase matched pairs).
C. Cole – Intel Corporation
2-27-2013
J. Calvin J. Dunford – Tektronix
8-27-2013
Figure 1: ATD DUT Test Diagram, Tektronix Generator
Tektronix ATD MOI for FDR Active Cables_Rev1_6a.docx
TP6A
Victim
D, D_N
TEK DSA8300 Equivalent Time
Scope – (80SJNBT Software)
BW 70GHz set to reasonable
limits
D, D_N D, D_N D, D_N
D, D_N
PPG3001 or BSA286C
(1 Ch Gen)
CH1
(14.0G)
Rx3
Tx3
Tx4
Rx2-Rx4 50-Ohm
Terminated
Rx4 - Victim
Data
I2C-Clk /
Data
MCB è Module Compliance Board
Tx1 - Victim
CH1 Jitter Impairments
Tek LE320
Emphasis
“IB_FDR_Victim”
Preset
Tx4 - Victim
PPG3002 (2 Ch Gen)
CH1
(14.0625)
Rx3
PC Connected to
a Diolan USB/I2C
Adaptor
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DUT Eye-Mask Measurement - by TEK DSA8300
InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
Limiting Active – Time-Domain Testing – Victim and Co-Propagating Crosstalk (FEXT) Calibration - Block Diagram
Primary Reference: IBTA Volume 2 Physical Specification Release – November 6th 2012
PPG3002 (2 Ch Gen)
CH1
(14.0625)
Data
Tek LE320
Emphasis
“IB_FDR_Victim”
Preset
Victim
Rx1
D, D_N
D, D_N
Rx3
D, D_N
QSFP PCB
Connector
MCB-1
Divider Network
X2
Co-Propagating
Aggressors
D, D_N
QSFP
Plug
HCB
(FEXT)
(Diff P airs) TP5a
Tx2
Tx1
D, D_N
TP6a
(Diff P airs)
Tx1
Tx2
Tx3
Tx1, Tx2, Tx3 50-Ohm
Terminated
Rx4
D, D_N
Tx3
TP6a
(Diff P air)
D, D_N
TEK DSA8300 Equivalent Time
Time Scope – BW 70GHz
(80SJNB Software)
(Diff P airs)
Rx1
Rx2
D, D_N D, D_N
(FEXT)
D, D_N
Rx3
Victim Eye-Mask Measurement - by TEK
DSA8300
Rx4
D, D_N D, D_N
Counterpropagating
(output)
Aggressors
(NEXT)
PPG3001 or BSA286C
(1 Ch Gen)
CH1
(14.0G)
P and N outputs of the
NEXT and FEXT divider
networks should plugged
in 180-degees out of
phase with each other
Tx4 - Victim
Data
CH2
(14.0625)
C2 Jitter Impairments
(Not Used)
Rx2
HCB è Host Compliance Board
used for calibration only
MCB è Module Compliance Board
Co-Propagating X-TALK
Measuring P oint. Tx1, Tx2, Tx3.
Measured one at a time.
Terminate when not measured
MCB-HCB Mated
Pair
TP7a
Rx1-Rx4 50-Ohm
Terminated
Tx4 - Victim
CH1 Jitter Impairments
Counter-Propagating X-TALK
Measuring P oint. Rx1, Rx2, Rx3,
Rx4 - Measured one at a time.
Terminate when not measured
Note: Input calibration eye-mask will actually be a
hexagonal mask (this was the measuremen t at PF-21
Divider Network
X2
Power Dividers are 5 way resistive couplers Tektronix part
number 174-6214-00. Required four units.
2.92 Cables are 16 pairs of Tektronix part number
PMCABLE1M (phase matched pairs).
C. Cole – Intel Corporation: 2-27-2013
J. Calvin , J. Dunford: Tektronix: 8-29-2013
Figure 2: ATD Victim and FEXT Calibration, Tektronix Generator
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Limiting Active – Time-Domain Testing – Counter Propagating (NEXT Calibration) - Block Diagram
Primary Reference: IBTA Volume 2 Physical Specification Release – November 6th 2012
HCB è Host Compliance Board
used for calibration only
MCB è Module Compliance Board
MCB-HCB Mated
Pair
PPG3002 (2 Ch Gen)
CH1
(14.0625)
Data
Data
CH2
(14.0625)
C2 Jitter Impairments
(Not Used)
Rx1
Rx2
Rx3
TP6A TP7a
Tx2 Rx2 Tx3 Rx3 Tx4 Rx4
Rx2-Rx4 50-Ohm
Terminated
Rx4
Rx1-Rx4 50-Ohm
Terminated
HCB
QSFP
Plug
D, D_N
QSFP PCB
Connector
Victim Calibration
Measurement point
MCB-2
Divider Network
X2
HCB – Rev3 –
Counter-Propagating
PN: PHY-SI QSFP28
Aggressors
(NEXT)
(Diff Pairs)
(Diff Pairs) TP5a
TP8a
Rx4
Tx4
Tx1 Rx2Tx2
Rx1
Tx3
Rx3
(Diff Pairs)
TP6a
Tx1
FEXT -Aggressors –
Tx2
Tx3
Tx4
NOT CONNECTED
D, D_N D, D_N D, D_N D, D_N
during Victim and
D, D_N D, D_N D, D_N D, D_N
NEXT calibration Tx1, Tx2, Tx3, Tx4 - Measured
one at a time – Terminate
when not measured
TEK DSA8300 Equivalent Time
Scope (80SJNB Software)
BW: 20GHz – QDR
BW: 30GHz – FDR
BW: 70GHz - EDR
D, D_N
PPG3001 or BSA286C
(1 Ch Gen)
CH1
(14.0G)
Rx4 - Victim
Not Used
for NEXT
Cal
Tx1 - Victim
CH1 Jitter Impairments
Tek LE320
Emphasis
“IB_FDR_Victim”
Preset
D, D_N
TP6A
TEK DSA8300 Equivalent Time
Scope (80SJNB Software)
BW: 20GHz – QDR
BW: 30GHz – FDR
BW: 70GHz - EDR
Counterpropagating
(input)
Aggressors
(NEXT)
Divider Network
X2
Power Dividers are 5 way resistive couplers Tektronix part
number 174-6214-00. Required four units.
2.92 Cables are 16 pairs of Tektronix part number
PMCABLE1M (phase matched pairs).
Divider Network Block Diagram
– Four Power Dividers required
– 16 phased matched SMA interconnect cables
will be required for two PPG driving aggressors
C. Cole – Intel Corporation
2-27-2013
J. Calvin/J. Dunford – Tektronix Inc
09/03/2013
Figure 3: NEXT Calibration Diagram, Tektronix Generator
Tektronix ATD MOI for FDR Active Cables_Rev1_6a.docx
03/27/2014 Revision 1.6 Page 13 of 20
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Active Time Domain Testing for FDR Cables
Appendix 1: Tables of QDR and FDR IBTA Victim Specifications
Victim Input Specifications - FDR
Data Rate
14.0625Gbps
UI
71.111ps
Pattern
PRBS31 (PRBS9-DDPWS)
X1*
0.11UI
7.822ps
X2*
0.31UI
22.004ps
Y1*
95mV
190mVpp Swing
Y2*
350mV
700mVpp Swing
J2*
0.19UI
13.51ps
J9*
0.34UI
24.17ps
DDPWS*
0.11UI
7.82ps
* Governed by Table 72
Victim Input Specifications - QDR
Data Rate
10.0Gbps
UI
100ps
Pattern
PRBS7
X1*
0.15UI
15ps
Y1*
250mV
500mVpp Swing
Y2*
600mV
1200mVpp Swing
TJ*
0.30UI
30ps
* Governed by Table 68
Victim Output Specifications - FDR
Data Rate
14.0625Gbps
UI
71.111ps
Pattern
PRBS31
X1-Max*
0.30UI
21.333ps
Y1*
50mv
100mVpp Swing
Y2*
225mV
450mVpp Swing
J2-Max*
0.44UI
31.28ps
J9-Max*
0.69UI
49.06ps
tr-Min*
17ps (20/80)
* Governed by Table 73
Victim Output Specifications - QDR
Data Rate
10.0Gbps
UI
100ps
Pattern
PRBS7
X1*
0.36UI
36.0ps
Y1*
100mV
200mVpp Swing
Y2*
600mV
1200mVpp Swing
TJ*
0.72UI
72.0ps
tr-Min
NA (Not Specified)
* Governed by Table 69
Tektronix ATD MOI for FDR Active Cables_Rev1_6a.docx
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InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
Appendix 2: Tables of QDR and FDR IBTA Aggressor Parameters
Co-Propagating FEXT Input Aggressors - FDR
Data Rate
14.0625Gbps
Comment
UI
71.111ps
Pattern
PRBS31
Amplitude +/- 20% victim VMA Initial setting 220-250mVpp
tr**
24ps (20/80)
No faster than
** Govered by Table 71 and 49
Co-Propagating FEXT Input Aggressors - QDR
Data Rate
10.0Gbps
Comment
UI
100ps
Pattern
PRBS7
Amplitude +/-20% victim VMA Initial setting 600-700mVpp
tr**
30ps (20/80)
No faster than
** Govered by Table 45
Counter Propagating NEXT Output Aggressors - FDR
Data Rate
14.0Gbps
Comment
UI
71.428ps
Pattern
PRBS31
Amplitude
450mV PP
NOT to exceed*
tr**
17ps (20/80)
No faster than
*Intention is to source largest amplitude allowed by Table 72
** Govered by Table 49
Counter Propagating NEXT Output Aggressor - QDR
Data Rate
9.9Gbps
Comment
UI
99ps
Pattern
PRBS7
Amplitude
1200mV PP
NOT to exceed*
tr**
30ps (20/80)
No faster than
* Intention is to source largest amplitude allowed by Table 69
** Govered by Table 45
Counter Propagating NEXT Input Aggressors - FDR
Data Rate
14.0Gbps
Comment
UI
71.428ps
Pattern
PRBS31
Amplitude
700mV PP
NOT to exceed*
tr**
24ps (20/80)
As close as possible
*Intention is to source largest amplitude allowed by Table 71
** Govered by Table 49
Counter Propagating NEXT Input Aggressors - QDR
Data Rate
9.9Gbps
Comment
UI
99ps
Pattern
PRBS7
Amplitude
1200mV PP
NOT to exceed*
tr**
30pS (20/80)
No faster than
* Intention is to source largest amplitude allowed by Table 68
** Govered by Table 45
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Active Time Domain Testing for FDR Cables
Appendix 3: Tables of FDR Settings used at Plug-Fest-22
Co-Propagating Input Aggressors -Target @250mVMA tr 24pS
Divider Diff Pair
TEK Measurement
VMA
Tx1 Amp 0.363Vpp SE
0.251
Diff
TX1 Rise
pS
Tx1Fall
pS
VMA
Tx4 Amp 0.363Vpp SE
0.244
Diff
TX4 Rise
pS
Tx4Fall
pS
Divider Math - For Individual Diff Pair
(Amp pp SE * 2 ) /4 = Vpp diff - loss thru divider
PPG Vpp Amp Vpp
divide by 4 Vpp
SE
Diff
Diff
Units
Vpp
0.726
1.452
Diff
0.363
Clock: 14.065-GHz – 1800A - Frame-A
Tektronix ATD MOI for FDR Active Cables_Rev1_6a.docx
Counter-Prop Output Aggressors -Target 450mVpp - tr
17pS
Divider Diff Pair
TEK Measurement
Vpp
RX1 Amp
0.433 Vpp SE
0.452
Diff
RX1 Rise
pS
RX1 Fall
pS
Vpp
RX3 Amp
0.433 Vpp SE
0.454
Diff
RX3 Rise
37.43
pS
RX3 Fall
pS
Divider Math - For Individual Diff Pair
(Amp pp SE * 2 ) /4 = Vpp diff - loss thru divider
PPG Vpp
divide by 4 Vpp
SE
Amp Vpp Diff Diff
Units
Vpp
1.12
2.24
Diff
0.560
Clock: 14.000-GHz 1800A - Frame-B
03/27/2014 Revision 1.6 Page 16 of 20
InfiniBand Trade Association
Active Time Domain Testing for FDR Cables
Appendix 4: Table of FDR Victim Measurements taken at IBTA Plug-Fest-22 October 2012
Victim Measurements on TEK 72004
TEK DSA 72004 Real-Time Scope
Parameter
Value Units Pattern
Vpp
Amplitude
0.428
Diff PRBS31
J2-A
8.42
pS
PRBS31
J2-B
11.31
pS
PRBS31
J2-Average
9.865
pS
PRBS31
J9-A
21.16
pS
PRBS31
J9-B
22.34
pS
PRBS31
J9-Average
21.75
pS
PRBS31
DDPWS
0.0696
UI
PRBS9
tr
21.4
pS
PRBS31
Note: J2 and J9 Measurements are “bracketed” on the TEK DSO72004
Tektronix ATD MOI for FDR Active Cables_Rev1_6a.docx
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Active Time Domain Testing for FDR Cables
Appendix 5: FDR Range Settings Commands using the Mellanox-Diolan – I2C-Bridge Device
These are the contents of “bat” files that have been created to control the Mellanox-Diolan I2C Bridge dongle
 Set Range 0 – File name: w238-239_to0.bat
o Contents:
cd C:\Program
i2c r -s:0x50
i2c w -s:0x50
i2c r -s:0x50
Files (x86)\Diolan\I2CBridge.x64\bin
-a:0x1:0x7f -d:0x1
-a:0x1:0x7f -d:0x1 3
-a:0x1:0x7f -d:0x1
i2c r -s:0x50 -a:0x1:0xee
i2c w -s:0x50 -a:0x1:0xee
PING 127.0.0.1 -n 1 >nul
i2c r -s:0x50 -a:0x1:0xef
i2c w -s:0x50 -a:0x1:0xef
PING 127.0.0.1 -n 1 >nul
i2c r -s:0x50 -a:0x1:0xee

-d:0x1
-d:0x1 00
-d:0x1
-d:0x1 00
-d:0x2
Set Range 1 – File name: w238-239_to1.bat
o Contents:
cd C:\Program Files (x86)\Diolan\I2CBridge.x64\bin
i2c r -s:0x50 -a:0x1:0x7f -d:0x1
i2c w -s:0x50 -a:0x1:0x7f -d:0x1 3
i2c r -s:0x50 -a:0x1:0x7f -d:0x1
i2c r -s:0x50 -a:0x1:0xee -d:0x1i2c w -s:0x50 -a:0x1:0xee -d:0x1 11
PING 127.0.0.1 -n 1 >nul
i2c r -s:0x50 -a:0x1:0xef -d:0x1
i2c w -s:0x50 -a:0x1:0xef -d:0x1 11
PING 127.0.0.1 -n 1 >nul
i2c r -s:0x50 -a:0x1:0xee -d:0x2
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Active Time Domain Testing for FDR Cables
Appendix 6: Allowable Spec and Measurement value margins.
Key sections of this MOI outline spec precise target measurement and calibration values. This table outlines
acceptable upper and lower bounds on these measurements.
Parameter
Window
Size
Unit
Min
Nominal
Max
Margin
Data Rate
1 UI
Gb/s
ps
14.0611
-
14.0625
71.111
14.0639
-
100ppm
Mask Hit Ratio
PRBS 31
-
4 x 10-5
-
5 x 10-5
1 x 10-5
ps
UI
ps
UI
ps
UI
12.83
0.18
22.93
0.32
7.43
0.1
13.51
0.19
24.14
0.34
7.82
0.11
14.19
0.2
25.35
0.36
8.21
0.12
1.35
0.02
2.42
0.03
0.78
0.01
CounterPropagating
NEXT
mV
686
700
700
CounterPropagating
FEXT
mV
CoPropagating
FEXT
mV
J2
PRBS 31
J9
PRBS 31
DDPWS
PRBS9
MOI
Step
Notes
Per Spec
Per Spec
Mask
Hits/Violations
Step 5
441
441
450
450
450
450
Tektronix ATD MOI for FDR Active Cables_Rev1_6a.docx
5%
5%
5%
2%
2%
2%
Step 3
Calculated
Normative Spec
Calculated
Normative Spec
Calculated
Normative Spec
Step 4
Nominal per spec
Step 1
Nominal per spec
Step 2
Nominal per spec
Step 3
Step 3
70
45
45
03/27/2014 Revision 1.6 Page 19 of 20
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Active Time Domain Testing for FDR
Cables
Appendix 8: Diagram at Active Optical Time Domain DUT Test Fixture
Figure 2: Picture of an AOC assembly being tested using Tektronix BSA286C, LE320, PPG3002 test equipment.
__________________________________________________________________________________________
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