Arista Compatible QSFP-40G-LRL4 - Functionally Identical 40GBASE-LR4 QSFP+ 1270/1290/1310/1330nm 2km DOM SMF Duplex LC Connector

In today’s data centers, high-performance, reliable connectivity is essential for sustaining rapid data throughput and scalable growth. The Arista Compatible QSFP-40G-LRL4 delivers a cost-effective, plug-and-play 40GBASE-LR4 solution that mirrors OEM LR4 performance while offering broad compatibility across Arista switches and other QSFP+ ports. Engineered for Single-Mode Fiber (SMF) networks, this transceiver leverages four precisely tuned wavelengths (1270, 1290, 1310, and 1330 nm) to maximize bandwidth and minimize crosstalk over distances up to 2 kilometers. With Digital Optical Monitoring (DOM) integrated, network operators gain real-time visibility into critical parameters, enabling proactive maintenance and reducing downtime. Whether upgrading a data center spine, expanding inter-building links, or enabling high-capacity server-to-servers connections, this module provides a robust, enterprise-grade option that aligns with performance, reliability, and cost considerations.

• Functionally identical to OEM 40GBASE-LR4 modules — This Arista-compatible QSFP-40G-LRL4 is crafted to replicate the electrical and optical behavior of factory LR4 transceivers. It supports the same signaling, framing, and connector interfaces, ensuring seamless interoperability with Arista switches and other QSFP+ ports. By delivering equivalent performance, it helps preserve existing network architectures and investments while enabling easy deployment across multi-vendor environments.
• Long-range LR4 over SMF with four wavelengths — The LR4 architecture uses four distinct wavelengths (1270/1290/1310/1330 nm) to carry aggregated 40 Gigabit per second traffic over a single-mode fiber link. This configuration supports efficient channelization and high-density data transfers, delivering up to 2 kilometers of reach on standard SMF (ITU-T G.652-D or better). It’s an ideal choice for data center interconnects, campus backbones, and fiber-rich environments that demand reliable, multi-source data transport without excessive fiber sprawl.
• Digital Optical Monitoring (DOM) for proactive maintenance — Built-in DOM provides continuous visibility into transmit power, receive power, temperature, and module health. Real-time monitoring enables network teams to detect performance drifts, misalignments, or impending component wear before they impact service. DOM data can be integrated into management platforms, helping with capacity planning, fault isolation, and predictive maintenance strategies.
• Easy installation and hot-swappable convenience — The QSFP+ form factor is designed for straightforward installation into compatible ports. In supported devices, these modules are hot-swappable, minimizing downtime during upgrades or replacements. The fiber side uses duplex LC connectors, which are compact, easy to manage, and well-suited for dense rack environments where space and organization matter.
• Cost-effective, enterprise-grade reliability — This transceiver offers a budget-friendly alternative to OEM LR4 modules without sacrificing performance or compatibility. It is engineered to meet the optical and electrical specifications required for 40G-LR4 operation, enabling scalable, resilient network growth while leveraging existing fiber infrastructure for a lower total cost of ownership.

Technical Details of Arista Compatible QSFP-40G-LRL4

• Form Factor: QSFP+
• Data Rate: 40GBASE-LR4
• Wavelengths: 1270/1290/1310/1330 nm
• Distance: Up to 2 km on SMF (typical)
• Fiber Type: Single-Mode Fiber (9/125 µm)
• Connector: Duplex LC
• DOM: Yes (Digital Optical Monitoring)
• Compatibility: Arista-compatible; functionally identical to OEM LR4 QSFP+ modules

How to install Arista Compatible QSFP-40G-LRL4

• Confirm port compatibility and that the device supports 40GBASE-LR4. If the platform supports hot-swapping, you can install without powering down; otherwise follow standard shutdown procedures per your equipment policy.
• Prepare the transceiver and fiber cables. Remove dust caps from the QSFP+ module and the duplex LC fiber ends. Ensure the SMF connectors are clean and properly terminated to prevent signal loss.
• Insert the QSFP-40G-LRL4 module into the QSFP+ port until it seats securely and the latch engages. Do not force the module; if it does not seat, remove and reinsert with even pressure.
• Connect the fiber with duplex LC cables: one fiber path for TX and one for RX, observing correct polarity. Gently mate the LC connectors to the transceiver’s receptacles until they click into place.
• Power on or verify the device’s port status. Use the network management interface to confirm link status at 40G and enable DOM monitoring if available. Check for link lights and verify that 40G lanes are active and error-free.

Frequently asked questions

• Q: What does “Arista Compatible” mean for this transceiver? A: It denotes that the module is designed to function identically to OEM 40GBASE-LR4 LR4 QSFP+ transceivers, with verified interoperability in Arista environments and across other QSFP+ ports, offering a cost-effective alternative without sacrificing performance.
• Q: What fiber and reach are supported? A: It operates over Single-Mode Fiber (SMF) with four wavelengths in the 1270–1330 nm range, delivering typical reach up to 2 kilometers for LR4-compatible links, suitable for data center backbones and interconnects.
• Q: Does this module include Digital Optical Monitoring (DOM)? A: Yes. DOM provides real-time metrics like transmit and receive power and temperature, enabling proactive monitoring and faster fault diagnosis.
• Q: Is installation difficult? A: Not for trained personnel. The module is designed to be installed into compatible QSFP+ ports with standard fiber cleaning and connection procedures. In supported devices, hot-swapping minimizes downtime during upgrades or replacements.
• Q: Is this a genuine Arista product? A: The module is described as Arista Compatible, meaning it is designed to emulate OEM LR4 performance and interoperability while offering a cost-effective alternative. Always verify compatibility with your specific hardware and firmware versions before deployment.