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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
Revision 3.01
Feb-18, 2013
VESA DisplayPort
PHY Compliance test Standard Version 1 Revision 2b
Agilent Method of Implementation (MOI) for DisplayPort
Cable Compliance Tests
Using Agilent E5071C ENA Option TDR
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
Table of Contents
1. Modification Record ....................................................................................................... 4
2. Purpose ........................................................................................................................... 4
3. References ...................................................................................................................... 4
4. Resource Requirements .................................................................................................. 4
5. Test Procedure ................................................................................................................ 5
5.1. Outline of Test Procedure ......................................................................................... 5
5.2. Instrument Setup ....................................................................................................... 6
5.3. Connection Configuration ........................................................................................ 7
5.4. Calibration .............................................................................................................. 10
5.4.1. Time Domain Calibration ................................................................................ 10
5.4.2. Frequency Domain Calibration ....................................................................... 14
5.4.3. Set System Impedance (Optional) ................................................................... 16
5.5. Measurement and Data Analysis ............................................................................ 17
5.5.1. Bulk Cable and Connector Impedance ............................................................ 17
5.5.2. Intra-Pair Skew ................................................................................................ 18
5.5.3. Insertion Loss .................................................................................................. 19
5.5.4. Return Loss ...................................................................................................... 20
5.5.5. Inter- pair Skew ............................................................................................... 21
5.5.6. Near End Noise (NEN) .................................................................................... 22
5.5.7. Far End Noise (FEN) ....................................................................................... 23
6. Appendix ...................................................................................................................... 28
6.1. Defining a calibration Kit ....................................................................................... 28
6.2. Manual Setup for Time Domain Measurement ...................................................... 31
6.2.1. Starting Setup .................................................................................................. 31
6.2.2. Bulk Cable and Connector Impedance Measurements (Normative) ............... 32
6.2.3. Intra-Pair Skew Measurement (Normative) .................................................... 33
6.2.4. Inter-pair Skew Measurements (Normative) ................................................... 35
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
6.3. Manual Setup for Frequency Domain Measurement .............................................. 35
6.3.1. Channel and Trace Settings ............................................................................. 35
6.3.2. Common Settings ............................................................................................ 36
6.3.3. Far End Noise (FEN) Measurement (Normative) ........................................... 36
6.3.4. Return Loss Measurement (Normative) .......................................................... 37
6.3.5. Insertion Loss Measurement (Normative) ....................................................... 37
6.3.6. Near End Noise (NEN) Measurement ............................................................. 37
6.4. Limit Test Settings .................................................................................................. 38
6.4.1. Displaying Judgment Result of Test ................................................................ 38
6.4.2. Setting the Warning Beeper ............................................................................. 38
6.4.3. Defining the Limit Line ................................................................................... 38
6.5. Calculating formula for Limit Line ........................................................................ 39
6.5.1. Bulk Cable and Connector Impedance ............................................................ 39
6.5.2. Insertion Loss .................................................................................................. 41
6.5.3. Return Loss ...................................................................................................... 42
6.5.4. Near End Noise (NEN) .................................................................................... 44
6.5.5. Far End Noise (FEN) ....................................................................................... 44
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
1. Modification Record
Revision Comments Issue Date
1.00 Initial Release. Dec 15, 2008
2.00 Revised measurement procedure for the option TDR Nov 1, 2010
3.00 Updated for the measurements requirements of Compliance Jan 31, 2013
Test Specification Ver.1.2b
3.01 Update the model number of required test fixture. Feb 18, 2013
2. Purpose
This test procedure was written to explain how to use the Agilent E5071C ENA Option
TDR to make the measurements required per VESA DisplayPort Standard Version 1,
Revision 2a.
3. References
VESA DisplayPort Standard Version 1, Revision 2a
VESA DisplayPort PHY Compliance Test Specification Version 1.2b
4. Resource Requirements
1. E5071C Network Analyzer with option TDR and option 4D5 or 4K5
2. Display Port test fixtures. BitifEye BIT-1050-0001-0, or an equivalent set of fixtures
and standards.
3. Four 3.5 mm cables 20 GHz bandwidth or equivalent
(Cables of equal length and characteristics must be used for all test ports)
4. 50 Ohm terminators to terminate unused channels (ex. Agilent 909D-301)
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
5. Test Procedure
5.1. Outline of Test Procedure
1. Connect 3.5 mm test cables to every test ports on the instrument.
2. Set measurement conditions.
3. Perform Calibration
4. Measurements and Data Analysis
Time Domain Measurements
- Bulk Cable and Connector Impedance Measurements (Normative).
- Intra-pair Skew Measurements (Normative).
- Inter-pair Skew Measurements (Normative).
Frequency Domain Measurements
- Insertion Loss Measurements (Normative).
- Return Loss Measurements (Normative).
- Near End Noise (NEN) Measurements.
- Far End Noise (FEN) Measurements (Normative).
Note: Hard Keys (Keys located on the Front panel of E5071C) are displayed in Blue color
and Bold. (Example: Avg, Analysis)
Note: Soft keys (Keys on the screen) are displayed in Bold. (Example: S11, Real, Transform)
Note: Buttons (in the TDR) are displayed in Green color and Bold. (Example: Trace, Rise
Time)
Note: Tabs (in the TDR) are displayed in Brown color and Bold. (Example: Setup, Trace
Control)
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
5.2. Instrument Setup
This section describes how to recall a state file for DisplayPort compliance test settings.
The state file can be downloaded from www.agilent.com/find/ena-tdr_dp-cabcon.
If you use your local PC to download, save the state file to a USB mass storage device in
order to move it to E5071C. Connect the USB mass storage device into the front USB port
of the E5071C. For manual settings, refer to Appendix.
1. If TDR setup wizard appears, click Close button on the wizard.
2. Open Setup tab (item 1).
3. Click Advanced Mode (item 2).
4. A dialog box appears requesting for confirmation. Then click Yes. (Clear the check box
for "Use Advanced Calibration Methods")
5. Click File (item 3) and select Recall State to open the Recall State dialog box.
6. Specify a folder and a file name, and click Open.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
5.3. Connection Configuration
This Section describes the screen configuration of the E5071C-TDR and the cable
connection.
Figure 5-1: Measurement screen description.
Channel 1 for time domain measurement is controlled by the TDR user interface at the
bottom of the screen and Channel 2 for frequency domain measurement is controlled by the
soft-key on the right-side of the screen and hard-key on the instrument front panel.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
Figure 5-2: Cable connection
The cables and fixtures should be connected to the instrument as shown in the figure above.
Table 5-1 shows the cable connection for each measurement item. The measurement items
of the same cable connection can be done simultaneously.
Table 5-1 Cable and Fixture Connection
ENA Port Number Port1 Port2 Port3 Port4
A ML0+ A ML0- B ML0+ B ML0-
Bulk Cable and Connector Impedance
A ML1+ A ML1- B ML1+ B ML1-
Intra-pair Skew
Fixture PIN Number
A ML2+ A ML2- B ML2+ B ML2-
Insertion Loss
A ML3+ A ML3- B ML3+ B ML3-
Return Loss
A AUX+ A AUX- B AUX+ B AUX-
A ML0+ A ML0- B ML0+ B ML0-
Inter-pair Skew A ML1+ A ML1- B ML1+ B ML1-
A ML2+ A ML2- B ML2+ B ML2-
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
A ML3+ A ML3- B ML3+ B ML3-
A AUX+ A AUX- B AUX+ B AUX-
A ML0+ A ML0- A AUX+ A AUX-
A ML1+ A ML1- A AUX+ A AUX-
A ML2+ A ML2- A AUX+ A AUX-
A ML3+ A ML3- A AUX+ A AUX-
Near End Noise (NEN)
B AUX+ B AUX- B ML0+ B ML0-
B AUX+ B AUX- B ML1+ B ML1-
B AUX+ B AUX- B ML2+ B ML2-
B AUX+ B AUX- B ML3+ B ML3-
A ML1+ A ML1- B ML0+ B ML0-
A AUX+ A AUX-
A ML0+ A ML0- B ML1+ B ML1-
A ML2+ A ML2-
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Far End Noise (FEN)
A ML1+ A ML1- B ML2+ B ML2-
A ML3+ A ML3-
A ML2+ A ML2- B ML3+ B ML3-
A ML0+ A ML0- B AUX+ B AUX-
A: Source Side
B: Sink Side
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Switch the Display Port cable end and repeat the same measurement for the opposite
direction.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
Description of Measurement Window
Background colors coincide with the table in the previous page.
5.4. Calibration
5.4.1. Time Domain Calibration
5.4.1.1. Deskew & Loss Compensation Calibration
1. Press Channel Next key to select Channel 1.
2. Open Setup tab (item 1).
3. Click Deskew&Loss (item 2) to launch the Deskew & Loss Compensation wizard.
4. Click Options (item3), then Deskew Options dialog box appears.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
5. Select standard type (item 4) to Short.
6. Connect "Short" standard to Port1.
7. Click Port 1 (item 5). Wait until the check-mark appears under Port1.
8. Connect "Short" standard to Port2.
9. Click Port 2 (item 6). Wait until the check-mark appears under Port2.
10. Connect "Short" standard to Port3.
11. Click Port 3 (item 7). Wait until the check-mark appears under Port3.
12. Connect "Short" standard to Port4.
13. Click Port 4 (item 8). Wait until the check-mark appears under Port4.
14. Click OK (item 9).
15. Click Next.
16. Connect "Thru" standard between Port 1 and Port 3.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
17. Click Measure (item 10).
18. Click Next (item 11).
19. Connect "Thru" standard between Port 2 and Port 4.
20. Click Measure (item12).
21. Click Next (item13).
22. Connect "Load" standard to Port 1.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
23. Click Port 1 (item 14). Wait until the check-mark appears under Port 1.
24. Connect "Load" standard to Port 2.
25. Click Port 2 (item 15). Wait until the check-mark appears under Port 2.
26. Connect "Load" standard to Port 3.
27. Click Port 3 (item 16). Wait until the check-mark appears under Port 3.
28. Connect "Load" standard to Port 4.
29. Click Port 4 (item 17). Wait until the check-mark appears under Port 4.
30. Click Apply (item 18).
31. Click Finish (item 19).
5.4.1.2. Set DUT Length
1. Click Auto (item 1) to measure the DUT length.
2. Connect the test fixture and DUT as follows.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
ENA Port Number Port1 Port2 Port3 Port4
Fixture Pin Number A ML0+ A ML0- B ML0+ B ML0-
A: Source Side, B: Sink Side
3. Click Measure (item 1).
4. Click Finish (item 2).
5.4.2. Frequency Domain Calibration
5.4.2.1. Define Cal kit
The cal kit definition file shall be provided by the fixture supplier or created according to
6.1 Defining a calibration Kit.
1. Press Cal key to select channel 2.
2. Click Cal Kit, then select a User.
3. Click Modify Cal Kit > Import Cal Kit... to open the dialog box.
4. Specify a folder, enter a file name, and click Open.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
5.4.2.2. TRL Calibration
1. Press Channel Next key to select channel 2.
2. Press Cal key.
3. Click Cal kit and select Cal kit which you previously defined.
4. Click Calibrate > 4-Port TRL Cal.
5. Click Thru/Line.
a) Connect "Thru" standard between Port 1 and Port 2.
b) Click 1-2 Thru/Line.
c) Connect "Thru" standard between Port 1 and Port 3.
d) Click 1-3 Thru/Line.
e) Connect "Thru" standard between Port 3 and Port 4.
f) Click 3-4 Thru/Line.
g) Click Return.
6. Click Reflect.
a) Connect "Short" or "Open" standard defined at subclass setting to Port 1.
b) Click Port1 Reflect.
c) Connect "Short" or "Open" standard defined at subclass setting to Port 2.
d) Click Port2 Reflect.
e) Connect "Short" or "Open" standard defined at subclass setting to Port 3.
f) Click Port3 Reflect.
g) Connect "Short" or "Open" standard defined at subclass setting to Port 4.
h) Click Port4 Reflect.
i) Click Return.
7. Click Line/Match
a) Click 1-2 Line/Match.
b) Connect "Load" standard between Port 1 and Port 2.
c) Click Line/Match 1[Load].
d) Connect "Line1" standard between Port 1 and Port 2.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
e) Click Line/Match 2[Line1].
f) Connect "Line2" standard between Port 1 and Port 2.
g) Click Line/Match 3[Line2].
h) Connect "Line3" standard between Port 1 and Port 2.
i) Click Line/Match 4[Line3].
j) Connect "Line4" standard between Port 1 and Port 2.
k) Click Line/Match 4[Line4].
l) Click Return.
m) Click 1-3 Line/Match and repeat step b) to l).
n) Click 3-4 Line/Match and repeat step b) to l).
o) Click Return.
8. Click Done to finish TRL 4-port calibration. At this point, the calibration coefficient is
calculated and saved. The error correction function is automatically turned on.
Note: Refer to "4-port TRL Calibration" in ENA online help for the detail.
5.4.3. Set System Impedance (Optional)
In case that Load standard is not 50 ohm, system impedance must be set to the actual Load
impedance.
1. Press Cal > Set Set Z0 to actual impedance of the Load standard.
2. Click Return.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
5.5. Measurement and Data Analysis
5.5.1. Bulk Cable and Connector Impedance
5.5.1.1. Load Limit File
Using limit line files distributed on www.agilent.com/find/ena-tdr_dp-cabcon, the ENA
automatically performs pass/fail test. Since pass/fail criteria vary depending on the Bit rate,
cable category or connector type, appropriate limit line files should be loaded prior to
making measurements.
1. Select a trace on which a limit line should be set.
2. Press Analysis > Limit Test > Edit Limit Line > Import from CSV File... to display
the Open dialog box.
3. Select an appropriate limit file according to the table for each measurement item.
4. Click Return.
Table 5-2: Impedance Limit File for Trace 1 and Trace 5 in Channel 1
Bit Rate Cable Category Connector Type File Name
All All Full-size DP DP_ImpedanceProfile_Full.CSV
All All Mini DP DP_ImpedanceProfile_Mini.CSV
5.5.1.2. Measurement
1. Connect the test fixture to the test cables according to Table 5-3. Unused test ports
should be terminated.
Table 5-3 Impedance, Intra-pair Skew, Insertion Loss and Return Loss Connection
ENA Port Number Port1 Port2 Port3 Port4
A ML0+ A ML0- B ML0+ B ML0-
A ML1+ A ML1- B ML1+ B ML1-
Fixture PIN Number A ML2+ A ML2- B ML2+ B ML2-
A ML3+ A ML3- B ML3+ B ML3-
A AUX+ A AUX- B AUX+ B AUX-
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
A: Source Side, B: Sink Side
2. Connect Display Port cable to the test fixture.
3. Press Channel Next key to select Channel 1.
4. Press Channel Max key to enlarge Channel 1.
5. Click Stop Single for Time Domain measurement.
5.5.1.3. Data Analysis
Read Pass/Fail signs on Trace 1 and Trace 5. (item 1 in Figure 5-3)
Figure 5-3: Time Domain Measurement Example
5.5.2. Intra-Pair Skew
5.5.2.1. Measurement
Refer to 5.5.1.2.
5.5.2.2. Data Analysis
Read the delta time between Trace 2 and Trace 6. (item 2 in Figure 5-3).
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
Intra-pair Skew Upper Limit for High Bit Rate Cable Assembly
Cable Category Limit
Cable Assembly delta time <= 50 ps, then Pass. Otherwise Fail.
Resizing Adaptor delta time <= 10 ps, then Pass. Otherwise Fail.
Extension Cable delta time <= 35 ps, then Pass. Otherwise Fail.
Intra-pair Skew Upper Limit for Reduced Bit Rate Cable Assembly
Cable Category Limit
Any delta time <= 250 ps, then Pass. Otherwise Fail.
5.5.3. Insertion Loss
5.5.3.1. Load Limit file
Refer to 5.5.1.1.
Table 5-4 Insertion Loss Limit Line File for Trace 3 in Channel 2
Bit Rate Cable Category Connector Type File Name
HBR Cable All DP_HBR_InsertionLoss_Cable.CSV
Resizing Adaptor All DP_HBR_InsertionLoss_Adapter.CSV
Extension Cable All DP_HBR_InsertionLoss_ExtCable.CSV
RBR All All DP_RBR_InsertionLoss.CSV
5.5.3.2. Measurement
1. Connect the test fixture to the test cables according to the Table 5-3. Unused test ports
should be terminated.
2. Connect Display Port cable to the test fixture.
3. Press Channel Next key to select Channel 1.
4. Press Channel Max key to enlarge Channel 1.
5. Press Trigger > Single for frequency domain measurement.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
5.5.3.3. Data Analysis
Read Pass/Fail signs on Trace 3. (item 1 in Figure 5-4).
Figure 5-4: Frequency Domain Measurement Example
5.5.4. Return Loss
5.5.4.1. Load Limit File
Refer to 5.5.1.1.
Table 5-5 Return Loss Limit Line File for Trace 2 and Trace 6 in Channel 2
Bit Rate Cable Category Connector Type File Name
HBR All All DP_HBR_ReturnLoss.CSV
RBR All All DP_RBR_ReturnLoss.CSV
5.5.4.2. Cable Connection
Refer to 5.5.1.2.
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Agilent MOI for DisplayPort Cable & Connector Compliance Tests
5.5.4.3. Data Analysis
Read Pass/Fail signs on Trace 3. (item 2 in Figure 5-4).
5.5.5. Inter- pair Skew
Measurement
1. Connect the test fixture to the test cables according to Table 5-3. Unused test ports
should be terminated.
2. Connect Display Port cable to the test fixture.
3. Press Channel Next key to select Channel 1.
4. Press Channel Max key to enlarge Channel 1.
5. Click Stop Single for Time Domain measurement.
6. Read the propagation delay (item 3 in Figure 5-3), and write it down.
7. Repeat step 1 to step 6 for every channel.
5.5.5.1. Data Analysis
Find the maximum and minimum value among the measured propagation delay. Then,
Inter-pair Skew = Absolute(maximum value