Transceiver BlueOptics BO25K859S3D 40G-QSFP-ESR4 Copper 10000 Mbit/s SFP+

The BlueOptics BO25K859S3D 40G-QSFP-ESR4 Copper transceiver is a compact module designed for high-speed network environments. It supports up to 10000 Mbit/s and uses a copper SFP+ interface to provide a short-range, high-throughput connection. The module is lightweight and compatible with Dell hardware, intended for network expansions, server uplinks and switch interconnects where a reliable 10 Gigabit Ethernet link is required.

Advantages

This transceiver offers a compact form factor and a copper SFP+ interface that simplifies installation in existing 10 Gigabit Ethernet ports. Its support for up to 10000 Mbit/s enables high-throughput links for data centre and enterprise networks. The module’s short maximum link distance is suitable for rack-to-rack and within-rack connections, and the lightweight metal housing contributes to thermal stability and mechanical robustness in dense installations.

Suitable for

• Rack-to-rack connections in data centres
• Switch-to-server uplinks requiring 10 Gigabit Ethernet
• Short-reach horizontal cabling within telecom rooms
• Upgrading Dell network equipment to support higher throughput

Key specifications

• Maximum data transfer rate: 10000 Mbit/s
• Interface type: SFP+ (copper)
• Ethernet interface: 10 Gigabit Ethernet
• Ethernet LAN (RJ-45) ports: 1
• Maximum transfer distance: 30 m
• Product colour: Silver
• Weight: 0.02 kg

How to use

Before installation, verify compatibility with the target switch or server, especially Dell equipment if applicable. Power down or follow hot‑swap procedures recommended by the hardware vendor, then insert the SFP+ copper transceiver into an available 10 Gigabit Ethernet slot until it seats firmly. Connect a suitable CAT6/CAT6A copper cable to the RJ‑45 port and configure the network interface in the operating system or switch management software to match the desired speed and duplex settings. Monitor link status LEDs and management interfaces to confirm the link is operational.

Recommendations

Use the transceiver for short-distance high-speed links up to 30 m with appropriate shielded or unshielded copper cabling rated for 10 Gigabit Ethernet. Ensure firmware and driver compatibility on connected devices and follow vendor guidelines for hot‑swap and electrostatic discharge protection during handling and installation.