How to use the CXP optical module

CXP optical modules are hot-swappable transceivers for high-density, short-reach optical networking, installed carefully into compatible slots and connected via multimode MPO/MTP fiber cables.

Understanding the CXP Module

CXP (Compact 100G Pluggable) modules are designed for short-reach parallel optical interconnects, supporting up to 120Gbps over multimode fiber. They convert 12 electrical 10Gbps signals into 12 optical channels using 850nm VCSEL laser arrays, transmitting through a 24-core MPO/MTP fiber cable. At the receiving end, a PIN photodiode array converts the optical signals back into electrical signals, enabling low-latency, high-throughput connections ideal for data centers and HPC environments ( ). CXP modules support breakout applications, allowing each lane to operate independently for 40G or 10G connections, but they are not directly compatible with QSFP-SR4 modules due to lane differences ( ).

Installation Steps

1. Prepare the Module: Unpack the CXP module carefully. Avoid touching the golden connector plating to prevent damage ( ).
2. Check Orientation: Ensure the pull latch (plastic or rubber) is on top and the module is correctly aligned with the slot ( ).
3. Insert the Module: Gently push the module into the slot until it makes firm contact. The module is hot-swappable, so the device does not need to be powered down ( ).
4. Dust Plug Handling: Do not remove the dust plug unless you are ready to connect an optical fiber. This prevents contamination and damage ( ).

Connecting Optical Fibers

• Use 24-core MPO/MTP multimode fiber cables for standard CXP connections.
• For breakout applications, ensure matching wavelength transceivers (e.g., 850nm SFP+) are used for each lane ( ).
• Maximum operating distances: 100 meters over OM3 fibers or 150 meters over OM4 fibers ( ).

Operational Considerations

• Power Consumption: Maximum 3.5W per module ( ).
• Operating Temperature: 0°C to 70°C ( ).
• Digital Optical Monitoring (DOM): Many CXP modules support DOM for real-time monitoring of optical power and temperature ( ).
• Breakout Support: CXP-100G-SR10 and SR12 modules support lane breakout for 40GBASE-SR4 or 10GBASE-SR applications ( ).

Safety and Compatibility

• CXP modules adhere to CXP MSA standards, ensuring interoperability and safety across vendors ( ).
• Avoid connecting directly to incompatible modules like QSFP-SR4 without proper breakout adapters ( ). By following these steps and guidelines, you can safely install, connect, and operate a CXP optical module in high-density networking environments, ensuring efficient, scalable, and reliable short-reach optical connectivity.