The EML Fiber Ethernet Switch was tested under standard operating conditions for FCC compliance, with detailed radiated emission measurements and environmental documentation confirming its performance.

Test Report Summary

The EML Fiber Ethernet Switch underwent testing to comply with FCC Part 15, Subpart B rules for industrial Ethernet equipment. The device was evaluated under typical operating conditions without any modifications to meet testing criteria, ensuring that the results reflect real-world performance .

Test Environment

• Laboratory: Shenzhen CTL Testing Technology Co., Ltd. EMC Laboratory, registered with the FCC and certified by A2LA, USA (Registration No.: 4343.01) for EMC testing .
• Test Setup: The switch was placed on a 0.8m-high turntable, 3 meters from the receiving antenna. The turntable rotated 360° to identify maximum emission levels, and the antenna polarization was varied between horizontal and vertical to capture the highest radiated emissions .
• Environmental Conditions: Measurements were conducted under controlled conditions, with uncertainty calculated according to CISPR 16-4 standards, ensuring accuracy within the calibration limits of the equipment .

Measurement Methodology

• Radiated Emission Test: Field strength was calculated using the formula: RA = Reading Amplitude + Antenna Factor + Cable Factor - Amplifier Gain - Duty Cycle Correction Factor. The six highest emissions were maximized to ensure compliance with FCC limits .
• Compliance Verification: The switch was tested across all relevant frequencies, and results were documented to confirm adherence to FCC emission standards .

Test Documentation

• Photos: The report includes setup photos of the EUT (Equipment Under Test) to illustrate the test configuration and procedures .
• Measurement Uncertainty: Expanded uncertainty was expressed at approximately 95% confidence level (k=2), accounting for component and process variability .

Additional Considerations for Fiber Ethernet Testing

For fiber-based Ethernet switches, testing may also involve SFP module evaluation using dedicated evaluation boards such as the EVB-KSZ9477 for KSZ9477S switches . Fiber optic system performance is typically assessed on a link-by-link basis, including passive components like fiber cables, connectors, adapters, and splices, to ensure the network meets required specifications .

Conclusion

The EML Fiber Ethernet Switch test report confirms that the device meets FCC Part 15 emission standards under standard operating conditions. The testing methodology, environmental controls, and measurement uncertainty documentation provide a comprehensive validation of the switch's compliance and performance. For further testing of fiber modules or network links, evaluation boards and fiber system testing procedures should be considered to ensure full network reliability and certification .