Common Devices Under Test

Typical products undergoing Ethernet signal integrity testing include:

• Network Interface Cards (NICs)
• Network Switches and Routers
• Industrial Ethernet Devices
• Communication Base Station Equipment
• Servers and Storage Systems
• Cable Assemblies (e.g., RJ-45, SFP+, QSFP cables)

ETHERNET Test Specifications

Key test specifications include:

• Electrical Characteristics: Such as voltage swing, steady-state levels, input/output impedance, etc.
• Timing Parameters: Including data setup time, hold time, clock skew, etc.
• Signal Integrity: Such as eye diagram quality, jitter, crosstalk, etc.
• Environmental Requirements: Such as the impact of temperature, humidity, and power supply noise on testing.

Common Ethernet Signal Integrity Physical Layer Test Items

The main signal integrity test items include:

• Eye Diagram Test: Examines the signal waveform's opening and noise margin at the receiver.
• Clock and Data Recovery (CDR) Test
• Jitter Analysis: Measures Unit Interval (UI) offset, periodic jitter, random jitter, etc.
• TDR/TDT Test: Evaluates trace impedance matching and reflection characteristics.
• Return Loss and Insertion Loss (S-parameter Test)
• Signal Swing and Rise/Fall Time
• Signal Template Mask Compliance Test

Commonly Used Test Instruments

Commonly used equipment includes:

• High-Bandwidth Real-Time Oscilloscopes (e.g., from Tektronix, Keysight)
• Bit Error Rate Testers (BERT)
• Vector Network Analyzers (VNA)
• Time Domain Reflectometers (TDR) / Transmission Testers (TDT)
• Ethernet Protocol Analyzers
• Dedicated Ethernet Test Platforms (e.g., from Spirent, Ixia)

Test Report