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Viewing the optical module in Linux

Fiber and communications infrastructure knowledge brief Published 08 Oct 2026

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

You can view optical module details in Linux using ethtool, sysfs paths, or specialized tools like the OOM Python library for EEPROM access. Using ethtool for Network Interface Cardsethtool is the standard Linux utility to query network interfaces and attached optical transceivers: Check link status and port details: BashCopyethtool Replace with your network interface name (e.g., eth0, p4p1). This shows link speed, duplex, port type, and whether the link is active.

View SFP/QSFP module information: BashCopyethtool -m This command displays module-specific details such as transceiver type, connector type, vendor name, serial number, laser wavelength, and supported distances. If the module supports Digital Optical Monitoring (DOM), it also shows real-time Tx/Rx power, temperature, and voltage. Example output: CodeCopyIdentifier: 0x03 (SFP)Connector: 0x07 (LC)Transceiver type: 10GBASE-SRVendor name: FINISAR CORP.

Laser wavelength: 850nmLength (OM3): 300m Accessing Fibre Channel HBAsFor Fibre Channel adapters, you can check module and HBA details via sysfs and Linux commands: List PCI devices: BashCopylspci | grep -i fibre Check loaded drivers: BashCopylsmod | grep Detailed HBA info: BashCopysystool -c fc_host -v This provides vendor, model, firmware, and link status. Programmatic Access with OOMThe Open Compute Project OOM library allows Python access to optical module EEPROMs: Install and use the library to read/write module keys such as serial number, module type, temperature, and transmit power. Supports both Python 2.

7 and 3.x, and works with CMIS and standard SFP/QSFP devices. Example usage: PythonCopyfrom oom import optoemodule = optoe.get_module(port=1)print(module.get('serial_number'))print(module.get('tx_power')) This is useful for automated monitoring or integration with network management scripts.

Additional Tips

Ensure your network card or switch supports DOM if you want real-time optical power readings. Use ip link or ifconfig to identify interface names before using ethtool. For advanced diagnostics, check /sys/class/net//device/ for additional module attributes.

By combining ethtool, sysfs inspection, and libraries like OOM, Linux provides comprehensive ways to monitor and manage optical transceivers across network and storage interfaces.

Viewing the optical module in Linux - CJC FIBRE CONSULTANTS [PDF]

Viewing the optical module in Linux

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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