40G Optical Module Test Report

40G QSFP optical modules, such as Moduletek QSFP-40G-SR4-C-G11 and H3C QSFP-40G-LR4L-WDM1300, have been tested to confirm full 40G Ethernet performance, switch compatibility, and reliable DOM monitoring.

Module Performance Overview

Moduletek QSFP-40G-SR4-C-G11 supports 40G transmission over multimode fiber (OM3, 50/125 µm) up to 100 meters. When tested on a Cisco N3K-C3064PQ-10GE switch, the module established a normal link, with port indicators active and module identification (type, serial number, bitrate) correctly displayed. DOM data was fully readable, confirming operational stability and compliance with expected thresholds .

H3C QSFP-40G-LR4L-WDM1300 supports 40G Ethernet over single-mode fiber (G.652) up to 2 km. Sample testing on an H3C S6820-56HF L3 switch showed normal link establishment, accurate module recognition, and DOM readings within thresholds, with no alarms reported .

Cisco QSFP-40G-SR4-S modules are aligned with IEEE 40GBASE-SR4 specifications, supporting high-bandwidth 40G optical links over 12-fiber parallel multimode fiber terminated with MPO/MTP connectors. Link lengths of 100–150 meters are supported depending on fiber type (OM3, OM4/OM5), and modules are certified for interoperability with Cisco QSFP 40G ports .

Test Procedures

Testing typically involves:

1. Module insertion into the corresponding switch port and connection to optical fiber patch cords or MTP self-loop devices.
2. Switch console access via control cables and software (e.g., SecureCRT) to verify port status, connection rate, alarms, module information, and DDM/DOM data .
3. Verification of link performance including connectivity, signal integrity, and compliance with IEEE 802.3ba standards.
4. DOM monitoring to ensure temperature, voltage, and optical power levels remain within safe operational thresholds.

Key Observations

• All tested 40G QSFP modules successfully established links on compatible switches.
• DOM/monitoring data was consistently readable, confirming real-time operational monitoring.
• Modules performed according to specifications for supported fiber types and link distances.
• No alarms or abnormal readings were reported during testing, indicating stable operation under standard conditions.

Conclusion

The 40G active optical modules tested, including Moduletek QSFP-40G-SR4-C-G11, H3C QSFP-40G-LR4L-WDM1300, and Cisco QSFP-40G-SR4-S, demonstrate reliable 40G Ethernet performance, proper switch recognition, and accurate DOM monitoring. These modules are suitable for high-speed data center and enterprise network deployments, supporting both multimode and single-mode fiber applications with verified operational stability .