40GSFP Optical Module Test Report

40G QSFP optical modules have been tested for performance, switch compatibility, and diagnostic monitoring, confirming reliable 40G Ethernet transmission over both single-mode and multimode fibers.

Juniper QSFP-40G-LX4 Test Summary

The Juniper QSFP-40G-LX4 module supports 40G Ethernet transmission up to 2 km over OS1 single-mode fiber (SMF), 100 m over OM3 multimode fiber, and 150 m over OM4 multimode fiber. Testing on a Juniper QFX5200-32C switch confirmed normal link establishment, proper port indicator illumination, and accurate module identification including type, part number, and serial number. Digital Optical Monitoring (DOM) parameters were within normal thresholds with no alarms, and the module operated in LAN-PHY mode at 40 Gbps with standard MTU 1514 settings. Loopback, source filtering, and flow control were disabled during testing, and the logical interface remained up and stable (et-0/0/0.0) .

H3C QSFP-40G-LR4L-WDM1300 Test Summary

The H3C QSFP-40G-LR4L-WDM1300 module supports 2 km transmission over G.652 single-mode fiber at 40G. When installed in an H3C S6820-56HF L3 switch, the module established a stable link with steady port indicators. The switch correctly read all module information, including vendor name, part number, serial number, transmission rate, and distance. DOM readings were normal, with all values within thresholds and no alarms. The module uses LC connectors and operates at a wavelength of 1300 nm .

Cisco QSFP-LR4-40G Test Summary

Cisco 40GBASE QSFP modules, including the LR4 variant, were tested for link connectivity, port status, alarm monitoring, and DDM information. The test procedure involved connecting the module to the switch port, verifying TX-RX fiber connections, and using console software to read module diagnostics. The modules met performance requirements, with stable 40G connectivity and accurate DDM readings. Test reports emphasize proper switch configuration and monitoring to ensure reliable operation .

Key Observations Across Modules

• Link Performance: All tested modules successfully established 40G links over their specified fiber types and distances.
• Switch Compatibility: Modules were correctly identified by their respective switches, including type, serial number, and operational parameters.
• DOM Monitoring: Digital Optical Monitoring data was within normal thresholds, with no alarms reported.
• Operational Stability: Modules maintained stable link status, proper port indicators, and expected interface flags during testing.
• Fiber Type Support: SMF and MMF support varies by module, with LX4 and LR4 modules optimized for longer single-mode distances, while SR4 modules target short multimode links .

Conclusion

The 40G QSFP optical modules tested demonstrate reliable high-speed Ethernet performance, accurate switch recognition, and stable DOM readings. These results confirm their suitability for data center, enterprise core, and high-performance computing networks, ensuring interoperability and operational reliability across different vendor platforms. Proper installation, fiber selection, and switch configuration are essential to achieve optimal performance.