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Agilent MOI for 100BASE-TX Ethernet Cable Tests
Revision 1.00
Sep-24, 2013
100BASE-TX Ethernet Cable
Agilent Method of Implementation (MOI) for
100BASE-TX Ethernet Cable Tests
Using Agilent E5071C ENA Option TDR
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
Table of Contents
1. Revision History ............................................................................................................. 3
2. Purpose ........................................................................................................................... 3
3. References ...................................................................................................................... 3
4. Required Equipments ..................................................................................................... 3
5. Test Procedure ................................................................................................................ 5
5.1. Outline of Test Procedure ......................................................................................... 5
5.2. Instrument Setup ....................................................................................................... 7
5.2.1. Recalling a State File ......................................................................................... 7
5.2.2. Saving a State File ............................................................................................. 8
5.3. Calibration ................................................................................................................ 9
5.3.1. Time Domain Calibration .................................................................................. 9
5.3.2. Frequency Domain Calibration ....................................................................... 11
5.4. Measurement .......................................................................................................... 14
5.4.1. Differential Characteristic Impedance ............................................................. 14
5.4.2. Insertion Loss .................................................................................................. 15
5.4.3. Return Loss ...................................................................................................... 16
5.4.4. Differential Near-End Crosstalk (NEXT) ........................................................ 17
6. [Appendix] Manual Setup ............................................................................................ 19
6.1. Channel & Trace Setup ........................................................................................... 19
6.2. Differential Characteristic Impedance .................................................................... 20
6.3. Common Parameters Setup for Frequency-domain Measurements ....................... 21
6.4. Insertion Loss ......................................................................................................... 22
6.5. Return Loss ............................................................................................................. 22
6.6. Differential Near-end Crosstalk (NEXT) ............................................................... 22
6.7. Defining Limit Line Tables .................................................................................... 23
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
1. Revision History
Revision Comments Issue Date
1.00 Initial Revision. Sep-24, 2013
2. Purpose
This test procedure was written to explain how to use the Agilent ENA Option TDR to
make the 100BASE-TX Ethernet cable measurements.
3. References
IEEE 802.3-2008 Section 2 (Jun. 2010)
4. Required Equipments
Description Test Equipment QTY
Network Analyzer Agilent E5071C ENA Series Network Analyzer 1 ea.
Option 440/445 (4.5 GHz) or 460/465 (6.5 GHz)
or 440/485 (8.5 GHz) or 4D5 (14 GHz) or 4K5
(20 GHz)
Option TDR (Enhanced time domain analysis)
4-port ECal Agilent N4431B (for E5071C 4.5 / 6.5 / 8.5 GHz) or 1 ea.
N4433A (for E5071C 14 / 20 GHz)
Test Fixture Test Fixture for Ethernet Application. (i.e. Agilent 2 ea.
P/N: N5392-66404)
Adapter 3.5 mm (f) to Type-N (m) (ex. Agilent 1250-1744) 4 ea.
for E5071C 8.5 GHz or
83059B coaxial adapter for E5071C 14 / 20 GHz.
RF cable 3.5 mm or SMA cables of 9 GHz bandwidth or more. 4 ea.
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
50 ohm terminator To terminate unused differential pairs (ex. Agilent 12 ea.
909D-301)
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
5. Test Procedure
5.1. Outline of Test Procedure
1. Instrument Setup
Automatic setup by recalling a state file or manual setup.
2. Calibration
ECal Calibration and Fixture Compensation (Time-domain measurements)
ECal Calibration and Port Extension (Frequency-domain measurements)
3. Measurements
4-1. Time-domain Measurements
- Differential Characteristic Impedance
4-2. Frequency-domain Measurements
- Insertion Loss
- Return Loss
- Differential Near-end Crosstalk (NEXT)
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
Note: Hard Keys (Keys on the E5071C's front panel) are displayed in Blue color and Bold.
(Example: Avg, Analysis)
Note: Soft keys (Keys on the E5071C's screen) are displayed in Bold. (Example: S11, Real,
Transform)
Note: Buttons of the TDR software are displayed in Green color and Bold. (Example: Trace,
Rise Time)
Note: Tabs of the TDR software are displayed in Brown color and Bold. (Example: Setup,
Trace Control)
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
5.2. Instrument Setup
5.2.1. Recalling a State File
This section describes how to recall a state file of the E5071C that includes all the
measurement settings for 100BASE-TX Ethernet cable tests. The state file can be
downloaded at: www.agilent.com/find/ena-tdr_ethernet-cabcon
Copy the state file into the E5071C's directory via USB mass storage device and recall the
state file using the TDR software. Necessary parameters for testing are automatically set up
in the E5071C. Refer to Appendix for the details about manual setup.
If TDR setup wizard is shown, click Close button in the TDR setup wizard main window.
1. Open Setup tab.
2. Click Advanced Mode to show the dialog box.
3. A dialog box appears requesting for confirmation. Then click Yes. (Uncheck "Use
Advanced Calibration Methods")
4. Click File and select Recall State to open the Recall State dialog box.
5. Specify a folder and a file name, and click Open.
The E5071C's channel 1 is used for time-domain measurements by using the TDR software
at the bottom of the E5071C's screen. The channel 2 is used for frequency-domain
measurements by using the soft key on the right side of the screen or hard key on the front
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
panel.
5.2.2. Saving a State File
All the measurement settings including calibration information can be saved in a state file
(*.tdr). After performing calibration, all necessary calibration coefficients are saved in a
state file and can be recalled for the next measurements.
1. Press Save/Recall > Save Type and select State & Cal as a state file type.
2. Click File of the TDR software.
3. Select "Save State".
4. Enter file name and save the state file with calibration information
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
5.3. Calibration
5.3.1. Time Domain Calibration
The purpose of this step is to calibrate the delay and loss of the RF cables (and test fixtures)
by following the wizard of the E5071C TDR software. Full calibration is performed by
using the 4-port ECal Module at the end of RF cables connected to the E5071C's test ports.
After connecting the test fixture to the cables, the effect of the fixture is removed by the
fixture compensation function of the TDR software. This calibration is applied for
time-domain measurements in Channel 1.
5.3.1.1. ECal Calibration & Fixture Compensation
Calibration for time-domain measurements is performed by the TDR software. The 4-port
ECal Module (i.e. N4431B) connected to the USB port of the E5071C is necessary for the
calibration procedure.
1. Press Channel Next to select Channel 1.
2. Open Setup tab of the TDR software.
3. Click ECal to launch calibration wizard.
4. Connect all test cables to the ECal Module and click Calibrate. Once green check
mark appears, click Next>.
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
5. Disconnect the ECal Module and connect the RF cables to the test fixtures. Click
Fixture Comp to perform fixture compensation. Once green check mark appears, click
Finish to complete the compensation.
6. Connect DUT to the test fixtures.
7. Open Setup tab.
8. Click Auto to launch the diagram.
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
9. Click Measure to specify DUT's electrical length in the dialog box. Once green check
mark appears, click Finish.
5.3.2. Frequency Domain Calibration
The purpose of this step is to calibrate out the RF effects (i.e. mismatch, loss or delay) of
RF cables and test fixtures. Full calibration is performed by using the 4-port ECal Module
at the end of RF cables connected to the E5071C's test ports. And then the test fixtures are
connected to the RF test cables, and the fixture's effect will be eliminated by auto port
extension function of the E5071C's firmware.
The calibration is applied for frequency-domain measurements in Channel 2.
5.3.2.1. ECal Calibration
Calibration for the frequency-domain measurement is performed by selecting the E5071C's
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
soft key. The 4-port ECal Module (i.e. N4431B) connected to the USB port of the E5071C
is necessary for the calibration procedure.
1. Press Channel Next key to select Channel 2.
2. Connect all RF test cables to the ECal Module.
3. Press Calibrate > ECal > 4-Port Cal.
5.3.2.2. Auto Port Extension
The effect of the test fixtures (i.e. delay) are removed by auto port extension function of the
E5071C's firmware. The calibration plane (at the RF test cables by ECal calibration) is
moved to the end of test fixtures by auto port extension.
1. Connect the RF cables to the test fixtures. The DUT is not connected to the test fixture
(the fixture end is left open).
Figure 5-1 Auto Port Extension Test Setup
2. Press Cal > Port Extension > Auto Port Extension > Select Ports and check all ports
(Port 1 to Port 4).
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
3. Press Cal > Port Extension > Auto Port Extension > Measure Open and select All
to enable auto port extension.
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
5.4. Measurement
The procedures for time-domain and frequency-domain measurements are introduced in
this section.
5.4.1. Differential Characteristic Impedance
1. Connect the DUT to the test fixtures to measure differential characteristic impedance of
link segment #1. (Figure 5-2).
E5071C Port 1 Port 2 Port 3 Port 4
Test Fixture TF1 DA+ TF1 DA- TF2 DA+ TF2 DA-
Note: Unused fixture ports should be terminated with 50 ohm terminators.
Figure 5-2 Differential Characteristic Impedance Test Setup (Link Segment #1)
2. Press Channel Next to select Channel 1 of the E5071C.
3. Select Trace 1. (Tdd11)
4. Press Stop Single.
5. Select Auto Scale and select X.
6. Confirm the nominal differential characteristic impedance at the near end of DUT is
100 ohm.
7. Select Trace 2 (Tdd22) and repeat the same operations of Step 5 to 6 at the far end of
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
DUT.
8. Connect the E5071C ports to the test fixtures with the RF cables to measure differential
characteristic impedance of link segment #2. (Figure 5-3).
E5071C Port 1 Port 2 Port 3 Port 4
Test Fixture TF1 DB+ TF1 DC- TF2 DB+ TF2 DC-
Note: Unused fixture ports should be terminated with 50 ohm terminators.
Figure 5-3 Differential Characteristic Impedance Test Setup (Link Segment #2)
9. Repeat the same operation of Step 3 to Step 7.
5.4.2. Insertion Loss
1. Connect DUT to the test fixtures to measure insertion loss of link segment #1(Figure
5-2).
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
E5071C Port 1 Port 2 Port 3 Port 4
Test Fixture TF1 DA+ TF1 DA- TF2 DA+ TF2 DA-
2. Press Channel Next to select Channel 2 of the E5071C.
3. Press Trace Next to select Trace 2 (Sdd21).
4. Press Trigger > Single.
5. Confirm the measured differential insertion loss is lower than the limit shown below.
6. Press Meas > Sdd12.
7. Press Trigger > Single.
8. Confirm the measured differential insertion loss is lower than the limit of Step 5.
9. Connect the E5071C and the test fixtures with the RF cables to measure insertion loss
of link segment #2. (Figure 5-3).
E5071C Port 1 Port 2 Port 3 Port 4
Test Fixture TF1 DB+ TF1 DC- TF2 DB+ TF2 DC-
10. Repeat the same operation of Step 3 to Step 8.
5.4.3. Return Loss
1. Connect the E5071C and the test fixtures with the RF cables to measure return loss of
link segment #1. (Figure 5-2)
E5071C Port 1 Port 2 Port 3 Port 4
Test Fixture TF1 DA+ TF1 DA- TF2 DA+ TF2 DA-
2. Press Trigger > Single.
3. Press Trace Next to select Trace 1 (Sdd11).
4. Confirm the measured return loss is lower than the limit shown below.
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
Where f is the frequency in MHz. The reference impedance shall be 100 ohm.
5. Press Trace Next to select Trace 4 (Sdd22).
6. Confirm the measured return loss is lower than the limit of Step 4.
7. Connect the E5071C and the test fixture with the RF cables to measure return loss of
link segment #2. (Figure 5-3).
E5071C Port 1 Port 2 Port 3 Port 4
Test Fixture TF1 DB+ TF1 DC- TF2 DB+ TF2 DC-
8. Repeat the same operation of Step 2 to Step 6.
5.4.4. Differential Near-End Crosstalk (NEXT)
The differential pair-to-pair near-end crosstalk (NEXT) between two pairs of link segments
is specified.
1. Connect the E5071C's ports (Port 1 to 4) and the test fixture with the RF cables to
measure NEXT at the near end of DUT. (Figure 5-4)
E5071C Port 1 Port 2 Port 3 Port 4
Test Fixture TF1 DB+ TF1 DC- TF1 DA+ TF1 DA-
Figure 5-4 Differential Near-end Crosstalk (NEXT) Test Setup
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
2. Press Trace Next to select Trace 3 (Sdd21).
3. Press Trigger > Single.
4. Confirm the measured differential near-end crosstalk is lower than the limit shown
below.
Where f is the frequency over the range of 1 MHz to 100 MHz.
5. Press Meas > Sdd12.
6. Confirm the measured differential near-end crosstalk is lower than the limit in Step 4.
7. Connect the E5071C's ports (Port 1 to 4) and the test fixture with the RF cables to
measure NEXT at the far end of DUT.
E5071C Port 1 Port 2 Port 3 Port 4
Test Fixture TF2 DB+ TF2 DC- TF2 DA+ TF2 DA-
8. Press Meas > Sdd21.
9. Press Trigger > Single.
10. Confirm the measured differential near-end crosstalk is lower than the limit in Step 4.
11. Press Meas > Sdd12.
12. Confirm the measured differential near-end crosstalk is lower than the limit in Step 4.
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
6. [Appendix] Manual Setup
The procedures of manual setup for time-domain and frequency-domain measurements are
introduced in the section. All the following parameters are saved in the E5071C's state file,
which is available at: www.agilent.com/find/ena-tdr_ethernet-cabcon
6.1. Channel & Trace Setup
If TDR setup wizard is shown when launching the TDR software, click Close button in the
TDR setup wizard main window.
1. Open Setup tab in the TDR software.
2. Click Preset to preset the instrument. Click OK in a dialog box to continue.
3. Set DUT Topology to "Differential 2-Port". Click OK in a dialog box.
4. Click Advanced Mode>>.
5. A dialog box appears requesting for confirmation. Then click Yes. (Clear the check box
for "Use Advanced Calibration Methods")
6. Click Stop Single.
7. Open TDR/TDT tab.
8. Click Trace Control tab.
9. Clear Time and Marker check box under Coupling.
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
10. Press Display > Allocate Channels > .
11. Press Display > Num of Traces > 2.
12. Press Display > Allocate Traces > x2 (1 column by 2 rows).
13. Press Channel Max to maximize the screen of Channel 1.
6.2. Differential Characteristic Impedance
1. Select Trace 1.
2. Open TDR/TDT tab.
3. Open Parameters tab.
4. Select "Time Domain" and "Differential" for Measure.
5. Select Format to "Impedance"
6. Click Tdd11.
7. Click the box below the left knob under Vertical. Set the vertical scale to "10 Ohm/div"
in a dialog box.
8. Click the box below the right knob under Vertical. Set the vertical center to "50 Ohm"
in a dialog box.
9. Open Trace Control tab.
10. Click Trace Settings Copy to launch trace copy dialog box.
11. Select the Trace 1 in the From list.
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
12. Select the Trace 2 in the To list.
13. Click Copy.
14. Click Close.
15. Select Trace 2.
16. Open Parameter tab.
17. Click Tdd22.
6.3. Common Parameters Setup for Frequency-domain Measurements
1. Press Channel Next to select Channel 2.
2. Press Start > Set start value to "1 MHz".
3. Press Stop > Set stop value to "200 MHz".
Note: The 100BASE-TX Ethernet cable is specified in the frequency range up to 100
MHz.
4. Press Analysis > Fixture Simulator and turn it ON.
6. Press Analysis > Fixture Simulator > Topology > Device > Bal-Bal
7. Press Analysis > Fixture Simulator > Topology > Port1 (bal) > 1-2
8. Press Analysis > Fixture Simulator > Topology > Port2 (bal) > 3-4
9. Press Display > Num of Traces > 4.
10. Press Analysis > Fixture Simulator > BalUn ON All Traces to enable mixed-mode
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
S-parameter (i.e. Sdd11) measurements on all traces.
11. Press Display > Allocate Traces > x4 (2 columns by 2 rows).
6.4. Insertion Loss
1. Press Trace Next to select Trace 2.
2. Press Meas > Sdd21.
3. Press Scale > Set Scale/Div to 10 dB/div.
4. Press Scale > Set Reference Value to -10 dB.
6.5. Return Loss
1. Press Trace Next to select Trace 1.
2. Press Meas > Sdd11.
3. Press Scale > Set Scale/Div to 10 dB/div.
4. Press Scale > Set Reference Value to -20 dB.
5. Press Trace Next to select Trace 4.
6. Press Meas > Sdd22.
7. Press Scale > Set Scale/Div to 10 dB/div.
8. Press Scale > Set Reference Value to -20 dB.
6.6. Differential Near-end Crosstalk (NEXT)
1. Press Trace Next to select Trace 3.
2. Press Meas > Sdd21.
3. Press Scale > Set Scale/Div to 10 dB/div.
4. Press Scale > Set Reference Value to -20 dB.
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Agilent MOI for 100BASE-TX Ethernet Cable Tests
6.7. Defining Limit Line Tables
1. Press Trace Next to select trace to set the limit line table.
2. Press Analysis > Limit Line and turn it ON to display limit lines.
3. Press Analysis > Edit Limit Line to edit the limit line table.
4. Press Analysis > Limit Test and turn it ON.
5. Press Analysis > Limit Test > Fail Sign to switch the fail sign ON/OFF. When turned
on, the Fail sign is displayed on the E5071C's screen, if one or more failed traces are
within the channel.
6. Press System > Misc Setup > Beeper > Beep Warning to turn ON/OFF the warning
beeper.
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