MaxLink 40G QSFP+ SR4 optical module ML-QSFPSR4, multimode, 850nm, MPO-12, up to 100m

The MaxLink 40G QSFP+ SR4 optical module ML-QSFPSR4 is a short-range transceiver designed for 40 Gigabit Ethernet over multimode fiber. It operates at an 850 nm wavelength and uses an MPO-12 connector to provide 4x10G parallel transmission. The module supports digital diagnostics monitoring (DDM) and is compatible with a broad range of network equipment that accepts standard QSFP+ SR4 transceivers.

Advantages

This QSFP+ SR4 module delivers 40 Gbps aggregate bandwidth using 12-fiber MPO multimode connections and supports distances suitable for typical data centre and aggregation links over OM3/OM4 fiber. The 850 nm wavelength and UPC polished connector provide reliable short-range optical performance, while the built-in diagnostics function allows monitoring of operational parameters such as temperature and optical power.

Suitable for

• 40 Gigabit Ethernet links in data centres and server rooms
• High-speed aggregation and spine-leaf network connections
• Short-reach multimode fiber runs over OM3/OM4 up to approximately 100 m

When it may not be suitable

This module is intended for short-range multimode fiber and is not suitable for single-mode or long-haul links. It requires MPO-12 multimode cabling and will not function on legacy duplex LC multi-mode or single-mode fiber runs without appropriate breakout or conversion hardware.

Key specifications

• Form factor: QSFP+
• Aggregate data rate: 40 Gbps (4×10G parallel)
• Wavelength: 850 nm
• Connector type: MPO-12
• Fiber type: Multimode (OM3/OM4 recommended)
• Typical reach: up to 100 m over OM3/OM4 multimode fiber
• Transmission: 12-fiber parallel
• Connector polishing: UPC
• Diagnostics: Digital Diagnostics Monitoring (DDM)

How to use

Install the module into a compatible QSFP+ port on a switch or host adapter, ensure the MPO-12 multimode cable is correctly aligned and secured, and verify link status via the device interface. Use OM3 or OM4 multimode fiber for reliable performance at the specified distances. Monitor module parameters through the switch or transceiver management interface that reports DDM values.

What to consider before purchase

• Ensure your switches or network devices accept QSFP+ SR4 transceivers and support 40G operation
• Confirm you have MPO-12 multimode cabling (OM3/OM4) and any required MPO breakout or fanout assemblies
• Verify required link distance is within the module's multimode range (up to ~100 m on OM3/OM4)

Usage recommendations

Use OM3 or OM4 multimode fiber with properly rated MPO-12 connectors and maintain clean connector endfaces. Verify compatibility with your network equipment and monitor DDM parameters to detect link issues early.