Technical Reference
InfiniBand Serial Data Compliance and Analysis
Application
Methods of Implementation (MOI)
071-2043-00
www.tektronix.com
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Table of Contents
Table of Contents
1 Introduction to RT-Eye InfiniBand Compliance Module......................1
2 Background on InfiniBand Compliance Testing....................................1
2.1 Compliance Statements and Test Definitions (TDs)...............................1
2.2 Integrator List Tests for InfiniBand........................................................4
3 InfiniBand Driver Compliance Measurements (MOIs).........................5
3.1 Required Equipment.................................................................................5
3.2 Connecting to the driver under test.........................................................5
3.2.1 SMA Connection .............................................................................6
3.2.2 ECB pad connection........................................................................7
4 Configuring a Device Under Test (DUT) for Compliance
Measurements ............................................................................................7
5 Initial Oscilloscope Setup..........................................................................8
6 Running the RT-Eye Software .................................................................9
6.1 DC Common Mode Measurement MOI................................................10
6.2 AC Common Mode Measurement MOI................................................11
6.3 Transmitter Peak-Peak Measurement MOI.........................................12
6.4 Rise/Fall Time Measurements................................................................14
6.5 Driver Jitter Measurements....................................................................15
6.6 Combining Driver Measurements..........................................................17
7 InfiniBand Cable Measurements............................................................17
7.1 Required Equipment...............................................................................17
7.2 Connecting to the Driver Under Test.....................................................18
7.3 Configuring the Device Under Test (DUT) for Compliance
Measurements.....................................................................................................18
7.4 Initial Oscilloscope Setup........................................................................18
7.5 Running the RT-Eye Software ...............................................................18
7.6 Cable Connected Minimum Differential Voltage.................................19
7.7 Combining Cable Measurements...........................................................20
8 Giving a Device an ID..............................................................................20
9 Creating a Compliance Report...............................................................20
10 Appendix A – Measurement Algorithms...............................................21
InfiniBand Compliance Measurements i
Table of Contents
ii InfiniBand Compliance Measurements
Methods of Implementation
1 Introduction to RT-Eye InfiniBand Compliance Module
This document provides the procedures for making InfiniBand compliance measurements with Tektronix
TDS/CSA7000, DSA/DPO 70000 and TDS6000 series real time oscilloscopes (4 GHz models and above).
The InfiniBand Compliance Module (Opt. IBA) is an optional software plug-in to the RT-Eye Serial Data
Compliance and Analysis application (Opt. RTE). The InfiniBand Compliance module provides Amplitude,
Timing, and Jitter measurements described in the electrical specification sections of the InfiniBand
Architecture Specification.
The IBTA-CIWG (InfiniBand Trade Association - Compliance and Interoperability Working Group) has
defined a suite of electrical measurements that InfiniBand devices must pass to qualify for the InfiniBand
Integrators List (IL). Manufacturers periodically perform these measurements on their InfiniBand devices at
InfiniBand plugfests. The RT-Eye InfiniBand Compliance Module automates and provides Pass/Fail limit
testing on many of these required IL measurements, as well as additional measurements that appear in the
electrical specification.
In the subsequent sections, step-by-step procedures are described to help you perform these measurements
on your InfiniBand devices. Measurements that are required to qualify for the IL are noted as such and
appear in the IBTA CIWG Subgroup Method of Implementation (MOI) document available for
download to IBTA members at
www.infinibandta.com.
2 Background on InfiniBand Compliance Testing
2.1 Compliance Statements and Test Definitions (TDs)
Compliance statements appear in the InfiniBand architecture specification.
Chapter 6 - driver characteristics compliance statement are as follows:
C6-7: All output ports SHALL comply with the parameters and notes of the Table 16 Driver
Characteristics using appropriate parameters as noted.
From compliance statements, the CIWG-PHY (Compliance and Interoperability Working Group –
Physical Layer Subgroup) has developed Test Definitions (TDs) for measurements in Table 16. Test
Definition assertions that have been given the following designations.
InfiniBand Compliance Measurements 1
Methods of Implementation
Table 1 – Chapter 6 Driver Test Definitions (TDs) from Table 16 of the Specification
CIWG-PHY
Measurement Symbol in
TD
Assertion
V2c6-
Common Mode Voltage VCM 0.5V 1.0V
007#01
V2c6-
Pk-Pk Differential Voltage Vdiff Table19
007#02
V2c6-
Disable Mode Output pk-pk Vdisable 0 85mV
007#03
V2c6-
Disable Mode Output max Vdisable 0 1.6V
007#03
V2c6-
Standby Mode Output pk-pk Vstandby 0 85mV
007#04
V2c6-
Standby Mode Output max Vstandby 0 1.6V
007#04
V2c6-
Driver Rise/Fall Time (20-80%) t
007#05
AC Common Mode Voltage V
V2c6-
Driver Total Jitter JT Table19*
007#14
Chap. 6, Table 16
100ps
DRF
25mV
ACCM
Min
Max
1
1.6V
V2c6-
Driver Deterministic l Jitter JD 0.17UI
007#14
1
Minimum Differential Pk-Pk Voltage and Jitter @ 10
specification. Test Points (compliance points) are defined based on where in the system the measurement is being made.
-12
BER is dependent on Table 19 in Chapter 6 of the InfiniBand
2 InfiniBand Compliance Measurements
Methods of Implementation
Figure 1 – Compliance Points from InfiniBand Specification
Chapter 7 Cable characteristics compliance statement is as follows:
C7-16: Cable assemblies to be used for InfiniBand shall meet the electrical requirements listed in Table 30
for all link widths for port type 1.
Table 2 – Chapter 7 Cable Test Definitions (TDs) from Table 30 of the Spec ification
CIWG-PHY TD
Assertion
V2c7-002#09 Cable Connector Near End Cross Talk
V2c7-002#010 Cable Assembly Min Differential Voltage VCout 316mV
V2c07-016#01
V2c07-016#02
V2c07-016#05 Cable Connection Jitter Jca .25UI
Measurement
Cable Differential Impedance Zdca(nom)
Symbol in
Min
Max
InfiniBand Compliance Measurements 3
Methods of Implementation
2.2 Integrator List Tests for InfiniBand
Table 3 shows the measurements that are available in the RT-Eye InfiniBand Compliance Module and how
they map to electrical measurements in Chapter 6 and Chapter 7 of the InfiniBand Architecture
Specification. Also shown is whether or not the measurement is an Integrator List (IL) test. IL tests are
required to have your device certified as InfiniBand compliant. Other measurements are useful, but not
required.
Table 3 – RT-Eye Measurements Mapped to Chapter 6 and Chapter 7 Measurements
Measurement
Electrical Driver Measurements (Chapter 6 of IBA Specification)
Waveform Eye Height Yes Yes
Waveform Eye Width No Yes
Common Mode DC Voltage No Yes
Common Mode AC Voltage No Yes
Transmitter Peak-Peak Voltage Yes Yes
Integrator List Tests
Available in RT-Eye InfiniBand
Compliance Module
Transmitter Transition Time
(20-80 Rise/FallTime)
Driver Total Jitter @ e
Electrical Cable Measurements (Chapter 7 of IBA Specification)
Cable Connected Eye Height No Yes
Cable Connected Eye Width No Yes
Cable Connection Jitter (TIE) Yes Yes
Cable Connector Minimum Differential
Voltage
Cable Connector Near End CrossTalk Yes
Cable Differential Impedance Yes
-12
BER Yes Yes
Yes Yes
Yes Yes
No (Use TDS8000 series sampling
oscilloscopes)
4 InfiniBand Compliance Measurements
Methods of Implementation
A
A
A
A
3 InfiniBand Driver Compliance Measurements (MOIs)
This section applies Methods of Implementation (MOI) to the Test Definitions as they relate to Tektronix
real-time oscilloscopes, probing solutions, and RT-Eye Serial Compliance and Analysis software.
3.1 Required Equipment
The following equipment is required to take the measurements in this document.
• TDS/CSA7404 or TDS6000 series oscilloscope equipped with TDS RT-Eye software (Opt. RTE) and
InfiniBand Compliance Module (IBA).
• Probes – probing configuration is MOI specific. Refer to each MOI for proper probe configuration.
• InfiniBand breakout cable (available from Fujikura Ltd.)
Figure 2 - Fujikura InfiniBand 4X Break-out harness
3.2 Connecting to the driver under test
The first step is to probe the link. Connect your probes based on one of the four methods described below.
Table 4 – Probing Configurations for an InfiniBand Link
Break
Serial
Link
Channels
Used
2
1
2
2
2
1
Probe
A
SMA
Connection
ECB
Pad
Connection
2 x TCA-SMA Y
B
1 x P7350SMA Y
2 x P7260
C
2 x P7350
2 x P7240
1 x P7350 Y/N
D
Y/N
Y/N
Y/N
Captured WaveformsProbing Configurations
Differential
Mode
Pseudo
True No 5GHz 65ps 4GHz 75ps
Pseudo
Pseudo
Pseudo
True No 5GHz 65ps 4GHz 75ps
Common
Mode
C 6GHz 53ps 4GHz 75ps
C/DC 6GHz 53ps 4GHz 75ps
C/DC 5GHz 65ps 4GHz 75ps
C/DC na na 4GHz 75ps
System Specifications
Band
Width
*Typical
Rise*
Time
(20-80)
TDS/CSA7404TDS6604
Band
Width
Rise*
Time
(20-80)
InfiniBand Compliance Measurements 5
Methods of Implementation
3.2.1 SMA Connection
1. Two TCA-SMA inputs using SMA
cables (Ch1) and (Ch3)
The differential signal is created by the
RT-Eye SW from the math waveform
Ch1-Ch3. The Common mode AC
measurement is also available in this
configuration from the common mode
waveform (Ch1+Ch3)/2. This probing
technique requires breaking the link
and terminating into the 50 Ω/side
termination into the oscilloscope. While
in this mode, the InfiniBand SerDes
will transmit the 320 bit Jitter test
pattern designed to maximize data
dependent jitter. Ch-Ch deskew is
required using this technique because
two channels are used.
2. One P7350SMA differential active
probe (Ch1)
The differential signal is measured
across the termination resistors inside
the P7350SMA probe. This probing
technique requires breaking the link.
While in this mode, the InfiniBand
SerDes will transmit the 320 bit Jitter
test pattern designed to maximize data
dependent jitter. Matched cables are
provided with the P7350 probe to avoid
introducing de-skew into the system.
Only one channel of the oscilloscope is
used.
Probe Configuration A
SMA Psuedo-differential
Probe Configuration B
SMA Input Differential Probe
6 InfiniBand Compliance Measurements
Methods of Implementation
3.2.2 ECB pad connection
3. Two P7260 single ended active probes (Ch1)
and (Ch3)
The differential signal is created by the RTEye SW from the math waveform Ch1-Ch3.
The Common mode AC measurement is also
available in this configuration from the
common mode waveform (Ch1+Ch3)/2. This
probing technique can be used for either a live
link that is transmitting data, or a link
terminated into a “dummy load.” In both cases,
the single ended signals should be probed as
close as possible to the termination resistors on
both sides with the shortest ground connection
possible. Ch-Ch deskew is required using this
technique because two channels are used.
4. One Differential probe
The differential signal is measured directly
across the termination resistors. This probing
technique can be used for either a live link that
is transmitting data, or a link terminated into a
“dummy load.” In both cases, the signals
should be probed as close as possible to the
termination resistors. A single channel of the
oscilloscope is used, so de-skew is not
necessary. Two P7350 differential probes can
be used to create probing configuration shown
in configuration “C” above.
Probe Configuration C
Two Single Ended Active Probes
Probe Configuration D
One Differential Active Probe
4 Configuring a Device Under Test (DUT) for Compliance
Measurements
To perform compliance measurements on an InfiniBand link, it is required that the link be configured to
generate Back to Back TS1 (BTBTS1) test pattern. The following describes various methods of obtaining a
TS1 signal out of ones HCA/TCA.
Beacon Method. The InfiniBand beacon signal is the default signal which is broadcast on a repeating basis
when there is no form of link established. The Beacon is comprised of 100 mSec of sleep state followed by
1 mSec of TS1’s back to back. A simple edge trigger on an instrument is capable of triggering on the leading
edge of this 1 mSec interval of TS1’s. It is recommended however that one use a delayed trigger of at least
50 uSec ensure the RC ramping found on the leading edge of this TS1 beacon be excluded from any
measurements. The trigger menu setup from TDS oscilloscopes to establish this delay is shown in Figure 3.
InfiniBand Compliance Measurements 7
Methods of Implementation
Figure 3 – Beacon method
Loop-Back Method. This method loops back the transmit line from an un-used lane into the receive lane 0
(Figure 4). This results in a periodic (100 mSec) link state training machine stimulus into IbtxIn(0) which
triggers a state change into the LTSM’s "configuration" state. The LTSM will broadcast 100 mSec of TS1’s
in a back to back form. This is the simplest method for generating the BTBTS1 pattern.
Note: The LTSM’s Config.RcvrCfg state generally cycles back around immediately into the
Config.debounce state in this configuration with no non-deterministic intervals introduced. Some systems
handle the transition through the LinkDown Default Idle state differently, and this transition can lead to a
short non-deterministic delay of ~30mSec before recycling into the Config.debounce state. In these systems
use the Instruments timeout trigger capability (dial in 10mSec timeout) combined with a trigger delay to
ensure this region of non-determinstic pre Donfig.debounce idle state does not appear in the region of data
over which jitter computations would occur. Failure to do this can result in an “insufficient number of
pattern repeats” warning.
Figure 4 – Loop back method
5 Initial Oscilloscope Setup
After hooking up to the DUT with the proper probing configuration for the test, press the DEFAULT frontpanel button and then the AUTOSET button to display the serial data bit stream.
8 InfiniBand Compliance Measurements
Methods of Implementation
6 Running the RT-Eye Software
1. Go to File > Run Application > RT-Eye Serial Compliance and Analysis.
Figure 5 – Default menu of the RT-Eye software
Figure 5 shows the oscilloscope display. The default mode of the software is the Serial Analysis module
(Opt. RTE). This software is intended for generalized Serial Data analysis on 8B/10B encoded copper links.
2. Select the InfiniBand Compliance Module from the Modules pull down list.
Figure 6 – Choosing the InfiniBand Compliance Module
Note: If InfiniBand does not appear in the list, the InfiniBand Compliance Module (Opt. IBA) has not been
installed.
The rest of this document details use of the RT-Eye InfiniBand Compliance Module to perform electrical
compliance measurements.
Online Help is available under the Help Menu for the software when it’s in the Serial Analysis Module. For
information not contained in this document, refer to the RT-Eye online help or the printable format.
InfiniBand Compliance Measurements 9
Methods of Implementation
6.1 DC Common Mode Measurement MOI
This test checks DC common mode voltage from the driver using Tektronix real-time oscilloscope, probes,
and RT-Eye compliance software. This test checks the common mode voltage level of the transmitter
output signal, is defined for a single physical bit lane, and must be repeated for each bit lane of each port
on the DUT.
• TD Assertion covered: V2c6-007.
• V
CM is defined in Vol. 2, Section 6.4, table Differential Output DC Characteristics,
Maximum V
• Integrator List Test: No.
• DUT Signaling: The test is performed on the TS1 ordered-sets captured by the oscilloscope while the
DUT is in the Polling Active state described in section 3.3
• Probing Configuration: Probe Configuration C - Use two P7260 or two P7240 active probes.
• Test Procedure is as follows:
• Connect the probe for the positive leg of the differential to Ch1 and the negative leg to Ch3.
CM=1.0V and Minimum VCM=0.50V.
• In the RT-Eye InfiniBand compliance module, select Single Ended as the Probe Type.
• Select CM Voltage as the measurement.
• Select the Configure Button to access the Configuration menu.
• Select the Source Tab and set up that menu as follows:
o Live as the Source Type.
o Select Ch1, Ch3 as the D+, D-.
• Select the Start button.
The RT-Eye application gives measurement results along with a Pass /Fail indication of the measurement.
See Figure 7.
Figure 7 - Result of the DC Common Mode Measurement
10 InfiniBand Compliance Measurements
Methods of Implementation
6.2 AC Common Mode Measurement MOI
This test checks the AC common mode voltage from the driver using a Tektronix real-time oscilloscope
and RT-Eye software. This test checks the common mode voltage level of the transmitter output signal, is
defined for a single physical bit lane, and must be repeated for each bit lane of each port on the DUT.
• TD Assertion covered: None.
• V
CM is defined in Vol. 2, Section 6.4, table Differential Output DC Characteristics,
Maximum VAC
• Integrator List Test: No.
• DUT Signaling: The test is performed on the TS1 ordered-sets captured by the oscilloscope while the
DUT is in the Polling Active state described in section 3.3.
• Probing Configurations (from section 3.2):
• Configuration A – Use TCA-SMA connectors with blocking capacitors.
• Configuration C - Use two P7260 or two P7240 active probes.
• Test Procedure as follows:
CM =25 mV RMS.
• Connect the probe for the positive leg of the differential to Ch1 and the negative leg to Ch3.
• In the RT-Eye InfiniBand compliance module, select Single Ended as the Probe Type.
• Select AC CM Voltage as the measurement.
• Select the Configure button to access the Configuration menus.
• Select the Source tab and set up that menu as follows:
o Live as the Source Type.
o Select Ch1, Ch3 as the D+, D-.
• Select the Start button.
The RT-Eye application gives measurement results along with a Pass /Fail indication of the measurement.
See Figure 8.
Figure 8 - Result of AC Common Mode Measurement
InfiniBand Compliance Measurements 11
Methods of Implementation
6.3 Transmitter Peak-Peak Measurement MOI
This test checks the Pk-Pk voltage from the driver using a Tektronix real-time oscilloscope and RT-Eye
software. This test checks the Pk-Pk differential voltage level of the transmitter output signal, is defined for
a single physical bit lane, and must be repeated for each bit lane of each port on the DUT. An eye diagram
is displayed to give additional information on the health of the transmitter.
• TD Assertion covered: V2c6-007#02
• Vdiff is defined in Vol. 2, Section 6.4, table Differential Output Differential Pk-Pk Voltage
Characteristics.
Maximum Vdiff = 1.6 V Pk-Pk, Minimum Vdiff is dependent on the test point.
Table 5 – Chapter 6 Test Point Descriptions, from Table 19 of the Specification*
Test
point
TP1 Transmitted signal at the board side of the backplane connector .800 250 ps
TP2 Transmitted signal at the backplane side of the backplane connector .750 240 ps
Description
Unsigned
Waveform
Amplitude
(IEEE181)
Eye Width
TP3 Received signal at the board side of the connector .316 150 ps
TP4 Received signal at the backplane side of the connector .335 160 ps
TP5 Transmitted signal at the board side of the cable connector .890 250 ps
TP6 Transmitted signal at the cable side of the cable connector .820 240 ps
TP7 Received signal at the board side of the cable connector .282 150 ps
TP8 Received signal at the cable side of the cable connector .300 160 ps
TP9 Transmitted signal at the board side of the pluggable interface socket .890 296 ps
TP10 Received signal at the board side of the pluggable interface socket .282 126 ps
* Measurements will require de-embedding or other compensation technique for properties of measurement
fixtures and test equipment.
• Integrator List Test: Yes
• DUT Signaling: The test is performed on the TS1 ordered-sets captured by the oscilloscope while the
DUT is in the Polling Active state described in section 3.3.
• Probing Configurations (from section 3.2):
• Configuration A – Use TCA-SMA connectors with blocking capacitors.
• Configuration B – Use P7350SMA probe (recommended).
• Connect via port breakout (Fujikura fixture in 4X case) to SMA inputs of probe configuration.
12 InfiniBand Compliance Measurements
Methods of Implementation
• Test Procedure is as follows:
• Connect the SMA connectors from the Break-out Harness to Ch1 and Ch3 of the oscilloscope, or
to Ch1 depending on the probe configuration used.
• In the RT-Eye InfiniBand compliance module, select Single Ended as the Probe Type if using
probe configuration (A), or Differential as the Probe Type if using probe configuration (B).
• Select Eye Height and Differential Voltage as the measurements.
• Select the Configure button to access the Configuration menus.
• Select the Source tab and set up that menu as follows:
o Live as the Source Type.
o Select Ch1, Ch3 as the D+, D- if using probe configuration (A) or select Ch1 if using probe
configuration (B).
• Select the Start button.
The RT-Eye application gives measurement results along with a Pass /Fail indication of the measurement.
See Figure 9.
Figure 9 - Result of the Differential Amplitude Measurement
The last two lines report Pass/Fail on Min and Max of Diff Voltage Pk-Pk. The waveform is also compared
to a waveform mask where the vertical and horizontal dimensions are defined by amplitude and jitter eye
width. Note that the Lower Limit on the voltage is listed as 986 mV. The specification indicates 890 mV as
the lower limit to TP5. Care should be taken to properly account and compensate for (Instruments external
attenuation menu) for all line losses between the test-point and the instrument inputs.
The signal tested in this example exhibited 989 mV Pk-Pk amplitude. The measurement is a cycle-cycle
differential voltage measurement on a 101 or a 010 bit combination. Note that this voltage is higher than
the measured Eye Height in the eye diagram (960 mV).
InfiniBand Compliance Measurements 13
Methods of Implementation
This is typical, since the eye diagram adds a “smearing affect” that hides the true minimum differential PkPk number. If you select the Details button in the RT-Eye software, it can be seen that the Min and Max
Pk-Pk measurement were derived from 23,283 valid measurements within the real time acquisition. See
Figure 10.
Figure 10 - Details View of Pk-Pk measurement
6.4 Rise/Fall Time Measurements
This test checks the Transition Times from the driver using Tektronix real-time oscilloscope and RT-Eye
software. This test checks the 20-80% Rise/Fall times of the transmitter output signal and compares them
against the specified limits. This test is defined for a single physical bit lane and must be repeated for each
bit lane of each port on the DUT.
• TD Assertion covered: V2c6-007#05
• tDRF is defined in Vol. 2, Section 6.4, Table 16 of the specification, Characteristics
Minimum tDRF = 100 ps.
• Integrator List Test: Yes
• DUT Signaling: The test is performed on the TS1 ordered-sets captured by the oscilloscope while the
DUT is in the Polling Active state described in section 3.3.
• Probing Configurations (from section 3.2):
• Configuration A – Use TCA-SMA connectors with blocking capacitors.
• Configuration B – Use P7350SMA probe (recommended).
• Connect via port breakout (Fujikura fixture in 4X case) to SMA inputs of probe configuration.
• Test Procedure is as follows:
• Connect the SMA connectors from the Break-out Harness to Ch1 and Ch3 of the oscilloscope, or
to Ch1 depending on the probe configuration used.
• In the RT-Eye InfiniBand compliance module, select Single Ended as the Probe Type if using
probe configuration (A) or Differential as the Probe Type if using probe configuration (B).
• Select Eye Height and Differential Voltage as the measurements.
• Select the Configure button to access the Configuration menus.
• Select the Source tab and set up that menu as follows:
o Live as the Source Type.
o Select Ch1, Ch3 as the D+, D- option if using probe configuration (A), or select Ch1 if using
probe configuration (B).
14 InfiniBand Compliance Measurements
Methods of Implementation
• Select the Meas Params tab and set up that menu as follows:
o TP6 (Transmitted signal at the cable side of the cable connector) as the Test Point.
o Stand By or Disable as the Differential Voltage Mode.
• Select the Start button.
The RT-Eye application gives measurement results along with a Pass /Fail indication of the measurement.
See Figure 11.
Figure 11 - Results of Transition Time Test
6.5 Driver Jitter Measurements
This test checks the Total Jitter from the driver using Tektronix real-time oscilloscope and RT-Eye
software. This test checks the values of Total Jitter @ 10
-12
BER and Deterministic Jitter and compares
them against the specified limits. This test is defined for a single physical bit lane and must be repeated for
each bit lane of each port on the DUT.
• TD Assertion covered: V2c6-007#14
• Total Jitter (J
) and Deterministic Jitter (JD) for the driver are defined in Vol. 2, Section 6.4, Table
T
16 Driver Characteristics. Jitter Eye Opening at different compliance points are defined in Table 5.
• Integrator List Test: Yes
• DUT Signaling: The test is performed on the TS1 ordered-sets captured by the oscilloscope while the
DUT is in the Polling Active state described in section 3.3.
• Probing Configurations (from section 3.2):
• Configuration A – Use TCA-SMA connectors with blocking capacitors.
• Configuration B – Use P7350SMA probe (recommended).
• Connect via port breakout (Fujikura fixture in 4X case) to SMA inputs of probe configuration.
• Test Procedure is as follows:
• Connect the SMA connectors from the Break-out Harness to Ch1 and Ch3 of the oscilloscope, or
to Ch1 depending on the probe configuration used.
• In the RT-Eye InfiniBand compliance module, select Single Ended as the Probe Type if using
probe configuration (A) or Differential as the Probe Type if using probe configuration (B).
• Select Jitter @ BER as the measurement.
• Select the Configure button to access the Configuration menus.
InfiniBand Compliance Measurements 15
Methods of Implementation
• Select the Source tab and set up that menu as follows:
o Live as the Source Type.
o Select Ch1, Ch3 as the D+, D- option if using probe configuration (A), or select Ch1 if using
probe configuration (B).
• Select the Meas Params tab and set up that menu as follows:
o TP6 (Transmitted signal at the cable side of the cable connector) as the Test Point.
o Stand By or Disable as the Differential Voltage Mode.
• Select the Start button.
The RT-Eye application gives measurement results along with a Pass /Fail indication of the measurement.
See Figure 12.
Figure 12 - Results of the Jitter Eye Opening @ 10
-12
BER Measurement
The results of the Total Jitter can be directly compared to Table 5, where:
Total Jitter + Jitter Eye Opening = 400ps (1UI)
Deterministic Jitter can be viewed by selecting it in the Measurement Details menu as shown in Figure 13.
Figure 13 – Deterministic jitter results
16 InfiniBand Compliance Measurements
Methods of Implementation
6.6 Combining Driver Measurements
Using the RT-Eye InfiniBand Compliance Module (Opt. IBA). all measurements can be made in a single
acquisition. Measurements that can be combined into a single acquisition are as follows:
• Eye Height/Eye Width
• Rise Time/Fall Time
• Unit Interval
• Jitter @ BER (RJ, DJ, TJ, and Jitter Eye Opening)
• Differential Voltage
7 InfiniBand Cable Measurements
7.1 Required Equipment
The following equipment is required to make the measurements in this document.
• TDS/CSA7404 or TDS6000 series oscilloscope equipped with TDS RT-Eye software (Opt. RTE)
and InfiniBand Compliance Module (IBA).
• DTG5000 series or AWG710 signal generator
• Probes – Probing configuration is MOI specific. Refer to each MOI for proper probe configuration.
• InfiniBand cable test fixture (available from Gore; see Figure 14)
Figure 14 – Gore cable test fixture
InfiniBand Compliance Measurements 17
Methods of Implementation
7.2 Connecting to the Driver Under Test
The connection method to the Device Under test is shown in Figure 15.
Low Jitter
(<30pSec Pk)
Signal Source
2.5Gb/Sec Aggressor Signal
IB Connector
Figure 15 – Test Setup for IB cable testing
This test setup shows the use of a P7350SMA Differential Active probe with SMA inputs. Alternatively,
each leg of the differential signal being tested can be connected to Ch1 and Ch3 of the oscilloscope and the
measurement can be made in a pseudo-differential manner.
7.3 Configuring the Device Under Test (DUT) for Compliance Measurements
The signal generator is setup to transmit a repeating CJTPAT (Compliance Jitter Test Pattern).
7.4 Initial Oscilloscope Setup
After connecting to the DUT with the proper probing configuration for the test, press the DEFAULT frontpanel button and then the AUTOSET button to display the serial data bit stream.
7.5 Running the RT-Eye Software
Go to File > Run Application > RT-Eye Serial Compliance and Analysis. The result should be similar to
Figure 3.
18 InfiniBand Compliance Measurements
Methods of Implementation
7.6 Cable Connected Minimum Differential Voltage
This test checks cable assembly minimum differential voltage using Tektronix real-time oscilloscope and
signal source. This test checks the minimum differential output voltage peak to peak of the Cable
connector output signal. This test is defined for a single physical bit lane and must be repeated for each bit
lane on the DUT(differential pair of cable).
• TD Assertion covered: V2c7-002#010
• Total Jitter (J
) and Deterministic Jitter (JD) for the driver are defined in Vol. 2, Section 6.4, Table
T
16 Driver Characteristics. Jitter Eye Opening at different compliance points are defined in Table 19
of the specification.
Notes:
• The test applies to the cable connector and to the cable assembly (ambiguously defined in the
InfiniBand Architecture Specification 1.1)
• Required instruments:
• Oscilloscope: TDS6604, TDS7404 or CSA7404 with SM option
• Signal source: Arbitrary Waveform Generator AWG610, AWG710, or DTG5000 Series.
• Differential Amplitude = 1 Vpp
• VCout (peak-peak), minimum differential output Voltage (peak-peak) limits defined in Vol.2,
Section 7.9.2, table Cable assembly electrical performance requirements.
• Vmeas is the minimum differential voltage measured at the center of the eye Diagram (Eye
Height).
• Test must be performed on each lane on the DUT.
• Integrator List Test: Yes
• DUT Signaling: The test is performed on the CJTPAT Ordered Sets captured by the oscilloscope.
The voltage measurement is taken for 1 Vpp Fibre Channel CJTPAT stimulus for 1000 waveforms or
equivalent.
• Probing Configurations (from section 3.2):
• Configuration A – Use TCA-SMA connectors with blocking capacitors.
• Configuration B – Use P7350SMA probe (recommended).
• Connect via port breakout (Fujikura fixture in 4X case) to SMA inputs of probe configuration.
• Test Procedure:
• Connect SMA connectors from Break-out Harness to Ch1 and Ch3 of the oscilloscope, or to Ch1
depending on the probe configuration used.
• In the RT-Eye InfiniBand compliance module, select Single Ended as the Probe Type if using
probe configuration (A) or Differential as the Probe Type if using probe configuration (B).
• Select Eye Width/Eye Height as the measurement.
• Select the Configure button to access the Configuration menus.
InfiniBand Compliance Measurements 19
Methods of Implementation
• Select the Source tab and set up that menu as follows:
o Live as the Source Type.
o Select Ch1, Ch3 as the D+, D- if using probe configuration (A) or select Ch1 if using probe
configuration (B).
• Select the Start button.
The RT-Eye application gives measurement results along with a Pass /Fail indication of the measurement.
See Figure 16.
Figure 16 - Results of the Cable Connected Minimum Differential test
7.7 Combining Cable Measurements
Using the RT-Eye InfiniBand Compliance Module (Opt. IBA). All measurements can be made in a single
acquisition. Measurements that can be combined into a single acquisition are as follows:
8 Giving a Device an ID
The InfiniBand Compliance Module provides a graphical user interface for entering a Device ID and
Description. Data entered here will appear on the compliance report and is recommended for device
tracking.
9 Creating a Compliance Report
To create a compliance report, select Utilities > Reports. The Report Generator utility can create a complete
report of the compliance test.
20 InfiniBand Compliance Measurements
Methods of Implementation
10 Appendix A – Measurement Algorithms
This section is under development.
InfiniBand Compliance Measurements 21
Methods of Implementation
22 InfiniBand Compliance Measurements
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