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A hot-pluggable Quad Small Form-factor Pluggable Plus (QSFP+) transceiver designed for 40 Gigabit Ethernet (40GbE) . It operates over Multi-Mode Fiber (MMF) using 850nm VCSEL technology to establish high-speed, short-distance links, typically up to 100/150 meters over standard OM3/OM4 fiber. This module is essential for inter-rack and intra-data center connectivity.

The Intel E40GSFP-SR is an optical module specifically engineered to meet the demands of high-bandwidth, short-range applications. It is compliant with the 40GBASE-SR4 standard, which dictates the use of four independent lanes, each transmitting at $\approx 10$ Gbps, for an aggregate 40 Gbps data rate.

• Wavelength and Media: It uses 850 nm VCSEL lasers and is designed exclusively for Multi-Mode Fiber (MMF).

• Reach: The reach depends on the fiber type: typically 100 meters on OM3 fiber and 150 meters on OM4 fiber, providing robust short-distance performance.

• Connector: It utilizes the MPO/MTP connector interface (Type B) for the multi-fiber ribbon cable required for parallel optics.

• Application: It’s primarily used for connecting Intel networking hardware (like NICs and switches) over short runs within the data center, often supporting 40G-to-4x10G breakout applications.

• Compliance: It is QSFP+ MSA compliant, ensuring compatibility with other MSA-compliant switches and routers.

Intel E40GQSFPSR Compatible 40GBASE-SR4 QSFP+ Transceiver (and similar modules like Intel E40GQSFPSR QSFP+ SR4 Optical Transceiver) are 40 Gbps optical transceiver modules used for high-speed fiber-optic networking — commonly in data centers, enterprise switches, routers, and servers.

They are compatible replacements for Intel’s original E40GQSFPSR OEM part, meaning they function like Intel’s branded optical module but are made by third-party manufacturers that pre-program the module to work with Intel networking gear.