UT-GBE-FT Voltage Meter
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Product Specifications
- Product Name: UT-GBE-FT100/1000M Ethernet Compliance Test
Fixture - User Manual Version: V1.0
- Release Date: June 2025
- Application Scenarios: 100Base-Tx Compliance Testing,
1000Base-Tx Compliance Testing
Product Usage Instructions
Test Fixture Overview
The UT-GBE-FT is a test fixture used in Ethernet compliance
testing. It includes a main fixture for Ethernet testing and a
return loss calibration fixture.
Fixture Layout
The fixture layout includes the Ethernet Test Main Fixture and
the Return Loss Calibration Fixture.
Accessory List
The kit includes the main test fixture, calibration test
fixture, 15 cm network cable, SMA load, and USB power supply
cable.
Ethernet Compliance Test Items
The test items include UTP differential voltage tests, overshoot
tests, AOI template tests, DCD/Jitter tests, return loss tests, and
more. Reference standards are IEEE802.3-2018 and ANSI
X3.263-1995.
Test Preparation
Before testing, prepare an oscilloscope that supports Ethernet
compliance testing, the device under test (DUT), and other
necessary test tools such as a test fixture, differential probe,
SMA cable, USB power cable, and Ethernet cable.
Oscilloscope Requirements
A differential probe with a bandwidth of at least 1GHz is
required. Recommended models include UT-PD1500, UT-PD2500,
UT-PD4000 Active Differential Probe.
Fixture Application
Connect the active differential probe to the fixture and power
supply using short RJ-45 interconnect cables for testing.
100Base-Tx Test Environment Setup
Set up the test environment according to the provided guidelines
for conducting 100Base-Tx compliance testing.
Frequently Asked Questions (FAQ)
Q: What are the main items included in the UT-GBE-FT kit?
A: The main items included are the main test fixture,
calibration test fixture, 15 cm network cable, SMA load, and USB
power supply cable.
Q: What standards are referenced for the Ethernet compliance
tests?
A: The tests reference standards IEEE802.3-2018 and ANSI
X3.263-1995.
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UT-GBE-FT
UT-GBE-FT100/1000M Ethernet Compliance Test Fixture
User Manual V1.0
June 2025
Document Overview
UT-GBE-FT
This document provides an overview of the layout and application scenarios of test fixtures used in Ethernet compliance testing. Fixture Ethernet Test Main Fixture Return Loss Calibration Fixture Application Scenarios 100Base-Tx Compliance Testing 1000Base-Tx Compliance Testing
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Fixture Layout
UT-GBE-FT
Figure 1-1 Ethernet Test Main Fixture
Each functional area of the fixture is described as follows: Zone SMA Connection Area Used for return loss test, equipped with balun and calibration board. Zone 2.54 mm Pin Area Used to connect differential probes for waveform testing. Zone Common-Mode Signal Testing Area Before testing, adjust the jumper cap to the desired test channel. Zone 100M Testing Area Before testing, connect the Device Under Test (DUT) and power the fixture via a USB cable. Begin testing when both D1 and D2 indicators are illuminated. Zone On-Board 100M Link Partner Area Functions as a built-in link partner for 100M Ethernet testing. Zone Disturber Signal Loading Area Designed with two sets of power dividers to introduce disturbance signals for noise margin testing. Zone Balun Area Contains a balun for return loss calibration during test setup.
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Figure 1-2 Return Loss Calibration Fixture
Return loss calibration area: Used for open-circuit, short-circuit, and load calibrations of a network analyzer during return loss testing.
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Accessory List
This section outlines the components included in the UT-GBE-FT kit along with standard accessories. All listed items can be ordered through UNI-T or its authorized distributors.
Accessory
Main test fixture Calibration test fixture 15 cm network cable SMA load USB power supply cable
Quantity
×1 ×1 ×1 ×6 ×1
Standard/Option
Standard Standard Standard Standard Standard
Ethernet Compliance Test
Test Item
Test Sub-item
UTP +Vout Differential
voltagePos
Peak differential voltage test UTP -Vout Differential
voltageNeg
Signal amplitude symmetry
Overshoot (Positive pulse
Overshoot Test
width) Overshoot (Negative pulse
width)
AOI Template Test
UTP AOI template
AOI Rise/Fall Time Test
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AOI +Vout rise time AOI +Vout fall time AOI +Vout rise/fall time symmetry AOI -Vout rise time AOI -Vout fall time AOI -Vout rise/fall time symmetry AOI Overall rise/ fall time symmetry
Reference Standard IEEE802.3-2018, Clause 25 ANSI X3.263-1995, Section 9.1.2.2
IEEE802.3-2018, Clause 25 ANSI X3.263-1995, Section 9.1.3 IEEE 802.3-2018, Clause 25 ANSI X3.263-1995, Appendix J
IEEE 802.3-2018, Clause 25 ANSI X3.263-1995, Section 9.1.6
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DCD/Jitter Test Return Loss Test
Transmitter jitter
Duty cycle distortion
Transmitter return loss Receiver return loss MDI (Media Dependent Interface) return loss
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IEEE 802.3-2018, Clause 25 ANSI X3.263-1995, Section 9.1.9 IEEE 802.3-2018, Clause 25 ANSI X3.263-1995, Section 9.1.8 to be continued to be continued to be continued
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Test Preparation
Before testing, please prepare the following equipment Oscilloscope that supports Ethernet compliance testing Device under test (DUT) Other test tools: Test fixture, differential probe, SMA cable, USB power cable, Ethernet cable
Oscilloscope Requirements
According to the 1000Base-T specifications outlined in the Ethernet conformance testing standard (IEEE 802.3), the oscilloscope must meet the minimum requirements: bandwidth: 1GHz; sample rate: 5GSa/s. UNI-T’s high-bandwidth oscilloscope series, such as the MSO7000X and MSO8000HD, fully satisfy these requirements, offering: Bandwidth range: 1GHz to 8GHz Maximum sample rate: 20GSa/s 12-bit ADC (MSO8000HD series): Delivers high-resolution, high-accuracy measurement results The MSO8000HD series excels in signal integrity, featuring: Low noise floor: <800V at 50mV/div vertical scale High ENOB: >7bits across the full bandwidth Low intrinsic jitter: 150fs RMS These characteristics ensure the authenticity and reliability of measurement data during Ethernet conformance testing.
Pre-Test Preparation for Oscilloscope
Before performing any tests, ensure the following operations are performed on the oscilloscope: Allow the oscilloscope to warm up for at least 30 minutes before use. Perform self-calibration if the ambient temperature changes by 5°C or more. Perform Function Check and Probe Calibration procedures. Note: The test procedures and connections described in this manual use the MSO7000X series oscilloscope as an example. For detailed instructions on self-calibration, function checks, and probe calibration, please refer to the MSO7000X Series Mixed Signal Oscilloscopes-User Manual and the UT-PD1500 Active Differential Probe-User Manual.
Probe Requirements
A differential probe is required for testing high-speed signals. The probe should have a bandwidth of at least 1GHz. Recommended models: UT-PD1500, UT-PD2500, UT-PD4000 Active Differential Probe.
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Fixture Application
Test Connection
UT-GBE-FT
Active Differential Probe Fixture Power Supply
Short (4 inch or 0.1m) RJ-45 interconnect Cable
100BASE-Tx Test Point
Figure 1-3 Probe Connection for 100BASE-Tx Compliance Test
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100Base-Tx Test Environment Setup
Differential amplitude, symmetry, overshoot, template, rise/fall time, jitter, and duty cycle tests
Set up the test environment as shown in Figure 2-1. Use the provided 15 cm network cable to connect the DUT to the J25 interface in Zone of the fixture. Insert the oscilloscope’s differential probe into the two pins of J30, also in Zone . Then, connect any USB port on the oscilloscope to the USB Type-B port in Zone of the fixture using the supplied USB cable to power the fixture. Note: Ensure correct polarity when connecting the differential probe. Once connected, the D1 (3.3V power) and D2 (100M mode) LEDs in Zone should illuminate. The oscilloscope should then display a waveform pattern similar to Figure 2-2. Launch the oscilloscope’s Ethernet compliance test software to begin testing.
Power supply interface Connect to DUT
LED turns on
Connect to the differential probe
Figure 2-1 100Base-Tx Test Environment Setup
Figure 2-2 100M Idle Pattern
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Transmitter Return Loss Test
Before testing, perform a calibration of the vector network analyzer (VNA). Use an SMA cable to connect Group A signal lines to the balun–specifically, connect DA+ to BAL+ and DA- to BAL-. Then, connect the SE (single-ended) output of the balun to Port 1 of the VNA, as shown in Figure 23. During the calibration, follow the on-screen instructions of the VNA. Insert the 15 cm network cable into the Open, Short, and Load interfaces on the calibration fixture one by one. After calibration is complete, remove the calibration board, insert the 15 cm network cable into the DUT, and power on the DUT, then complete the transmitter return loss test using VNA.
Figure 2-3 Transmitter Return Loss Calibration and Test Connection
Receiver Return Loss Test
Before testing, perform a calibration of the vector network analyzer (VNA). Use an SMA cable to connect Group B signal lines to the balun–specifically, connect DB+ to BAL+ and DB- to BAL-. Then, connect the SE (single-ended) output of the balun to Port 1 of the VNA, as shown in Figure 24. During the calibration, follow the on-screen instructions of the VNA. Insert the 15 cm network cable into the Open, Short, and Load interfaces on the calibration fixture one by one. After calibration is complete, remove the calibration board, insert the 15 cm network cable into the DUT, and power on the DUT, then complete the receiver return loss test using the VNA.
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Figure 2-4 Receiver Return Loss Calibration and Test Connection
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1000Base-T Test Environment Setup
Peak output voltage, differential output templates, and maximum output droop tests
There are two test environment setups: without disturbing signal and with disturbing signal. Without disturbing signal:
Set up the test environment as shown in Figure 3-1. Connect the differential probe to the DB port in Zone , and connect the DUT to the J6 port. With disturbing signal: Set up the test environment as shown in Figure 3-2. Connect DIST+ and DIST- to the disturbing source and connect SCOPE+ and SCOPE- to the oscilloscope. Connect the Tx differential signals to the power splitter using SMA cables (DUT+ to DA+, DUT- to DA-). Then connect the DUT to the J7 port. If calibration of the disturbing signal amplitude is required, refer to Figure 5-2 and 5-3. After completing the setup, power on the DUT to start the test. Ensure that the test mode is configured to Mode 1 for this procedure.
Connect to differential probe
Connect to DUT
Figure 3-1 Mode 1 Test Connection Without Disturbing Signal
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Connect both ends to the oscilloscope
Connect both ends to the disturbing source
Connect using the SMA
cable
Connect using the SMA cable
Connect to load 50, respectively
Connect to DUT
Figure3-2 Mode 1 Test Connection With Disturbing Signal
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Transmitter Distortion Test
Set up the test environment as shown in Figure 3-1 or 3-2. Ensure that the oscilloscope is triggered by the Tx_TCLK signal and that the test mode is set to Mode 4 to match the test requirements.
MDI Common Output Test
Set up the test environment as shown in Figure 3-3. Use the jumper cap to select the channel under test–only one channel group can be selected at a time. Ensure that the test mode is configured to Mode 4 to meet the test requirements.
Jumper slot, channel selection
Connect to the oscilloscope
Connect to DUT
Figure 3-3 MDI Common Mode Output Test Connection
Jitter Test
This test fixture supports only Jtxout jitter testing. For the connection setup, refer to Figure 3-1. The oscilloscope must be triggered by the Tx_tclk signal, and the test mode should be set to Mode 2 or 3. Note that the test results are for reference only, as the specification does not define a limit for this parameter. The measurement points for Tx_tclk jitter–whether filtered or unfiltered–in both Master and Slave modes are located on the Tx_tclk signal, not on the fixture itself. Jitter testing in Slave mode requires a specialized jitter test channel (i.e., a 120-meter Cat 5 cable with segmented 100 and 120 impedance sections), which is not supported by this fixture.
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Return Loss Test
The return loss test method is similar to that of 100Base-Tx, but with the following differences: All signal groups (A, B, C, D) must be tested. The test mode should be set to Mode 4. The return loss mask (template) is different from that used in the 100Base-Tx test.
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Jumper Cap
UT-GBE-FT
Figure 4-1 Jumper Cap Storage
Bit No.
J22
Name
Jumper Storage
Description
Used to store unused jumper caps. This area has no electrical connections.
Figure 4-2 Common Mode Channel and Load Selection Jumper Cap
Bit No.
J14 J20 J21 J17 J19
Name
A C D B /
Description
Selects 1000Base-T Channel A Selects 1000Base-T Channel C Selects 1000Base-T Channel D Selects 1000Base-T Channel B Onboard 50-ohm load selection jumper cap (not installed by default)
Figure 4-3 Onboard Link Partner Configured with Jumper Cap
Bit No. Name
Description
J26
M0
Reserved, connected to high level by default
J27
M1
Reserved, connected to high level by default
J28
M2
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Reserved, connected to low level by default
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Appendix
1000Base-T Test Mode
For 1000Base-T test, different test items require specific test mode configurations. Refer to Figure 5-1, sourced from IEEE Standard 802.3, Section 40.6.1.1.2, for the corresponding test mode requirements.
Figure 5-1 1000Base-T Test Mode
1000Base-T Test Disturbing Signal Configuration
For testing scenarios involving disturbing signals, refer to Figure 5-2 for the disturbing amplitude and frequency. This figure is extracted from IEEE 802.3 standard, Section 40.6.1.1.3. The peak output voltage test, differential output template test, and maximum droop test use a
disturbing signal of 2.8V at 31.25MHz. The transmitter distortion test uses a disturbing signal of 5.4V at 20.833MHz.
Figure 5-2 1000Base-T Disturbing Signal Configuration
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1000Base-T Test Disturbing Signal Calibration
If calibration of the disturbing signal amplitude is required, refer to Figure 5-3 for the connection setup. Note that the disturbing signal is differential. When using two single-ended disturbing sources, synchronization between them must be configured according to the instrument manufacturer’s guidelines.
Connect to load 50
Connect to the disturbing source
Connect to the oscilloscope
Figure 5-3 Disturbing Signal Calibration Connection
Onboard Balun Characteristic
Figure 5-4 Balun Insertion Loss
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Figure 5-5 Balun Return Loss
Onboard Power Divider Characteristic
Figure 5-6 Power Divider Insertion Loss
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Figure 5-7 Power Divider Return Loss
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Test Example
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100Base-Tx Ethernet Compliance Test
Set up the test environment as shown in Figure 2-1. Use the provided 15 cm network cable to connect the DUT to the J25 interface in Zone of the fixture. Insert the oscilloscope’s differential probe into the two pins of J30, also in Zone . Then, connect any USB port on the oscilloscope to the USB Type-B port in Zone of the fixture using the supplied USB cable to power the fixture. Note: Ensure correct polarity when connecting the differential probe. Once connected, the D1 (3.3V power) and D2 (100M mode) LEDs in Zone should illuminate. The oscilloscope should then display a waveform pattern similar to Figure 2-2. Launch the oscilloscope’s Ethernet compliance test software to begin testing.
Open Compliance Analysis Test
Click Test settings to open the configuration window. Select the required test items and configure the settings based on actual testing requirements. Click Start to begin the test after completing the configuration.
Test Item and Parameter Configuration
Once the test is complete, the system will automatically generate a comprehensive test report based
on the configured parameters. The report clearly presents the Pass/Fail results for each test item,
along with data tables and test screenshots for intuitive analysis.
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Pass/Fail Result, Test Data Table
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Test Data Table and Test Screenshot
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Limited Warranty and Liability
UNI-T guarantees that the Instrument product is free from any defect in material and workmanship within three years from the purchase date. This warranty does not apply to damages caused by accident, negligence, misuse, modification, contamination, or improper handling. If you need a warranty service within the warranty period, please contact your seller directly. UNI-T will not be responsible for any special, indirect, incidental, or subsequent damage or loss caused by using this device. For the probes and accessories, the warranty period is one year. Visit instrument.uni-trend.com for full warranty information.
Learn more at: www.uni-trend.com Register your product to confirm your ownership. You will also get product notifications, update alerts, exclusive offers and all the latest information you need to know.
is the licensed trademark of UNI-TREND TECHNOLOGY (CHINA) CO., Ltd. UNI-T products are protected under patent laws in China and internationally, covering both granted and pending patents. Licensed software products are the properties of UNI-Trend and its subsidiaries or suppliers, all rights reserved. This manual contains information that replaces all earlier published versions. The product information in this document is subject to update without notice. For more information on UNI-T Test & Measure Instrument products, applications, or service, please contact UNI-T instrument for support, the support center is available on www.uni-trend.com ->instruments.uni-trend.com https://instruments.uni-trend.com/ContactForm/
UT-GBE-FT
Headquarter
Europe
North America
UNI-TREND TECHNOLOGY (CHINA) UNI-TREND TECHNOLOGY EU
CO., Ltd.
GmbH
UNI-TREND TECHNOLOGY US INC.
Address: No.6, Industrial North 1st Address: Steinerne Furt 62, 86167
Road, Songshan Lake Park,
Augsburg, Germany
Dongguan City, Guangdong Province, China
Tel: +49 (0)821 8879980
Tel: (86-769) 8572 3888
Address: 2692 Gravel Drive, Building 5, Fort Worth, Texas 76118 Tel: +1-888-668-8648
Documents / Resources
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UNI-T UT-GBE-FT Voltage Meter [pdf] User Manual UT-GBE-FT, UT-GBE-FT100, UT-GBE-FT1000M, UT-GBE-FT Voltage Meter, Voltage Meter, Meter |