Dell 312K4 SolarFlare SFN7042Q 40G 2P QSFP FH

Overview

The Dell SolarFlare SFN7042Q 40G 2P QSFP FH (part number 312K4) is a high-performance, hot-plugable transceiver designed for data center and enterprise networking environments that demand reliable 40 Gigabit Ethernet connectivity over multimode fiber. Engineered to meet the rigorous standards of Dell PowerSwitch platforms, this module delivers low latency, error-free transmission while supporting both full-duplex and duplex modes.

Key Features

• 40 Gbps data rate per port with 2 ports in a single QSFP28 form factor
• Supports 850 nm multimode fiber (MMF) up to 150 meters using OM4 cable
• Compliance with IEEE 802.3ba and 802.3bm standards for 40GBASE-SR4
• Hot-swap capable - install or replace without powering down the switch
• Low power consumption of less than 4 watts per port
• Built-in digital diagnostic monitoring (DDM) for real-time performance tracking

Technical Specifications

• Form factor: QSFP28, 2-port (2P)
• Connector type: MPO-12, multimode fiber
• Wavelength: 850 nanometers
• Maximum reach: 150 meters on OM4 MMF (up to 100 meters on OM3)
• Operating temperature: 0 to 70 degrees Celsius
• Power draw: max 8 watts total for both ports
• Return loss: better than -7 dB
• Insertion loss: less than 2.5 dB per channel

Applications

• High-speed data center interconnects and spine-leaf architectures
• Enterprise campus networks requiring 40G uplinks to aggregation switches
• Virtualized environments with heavy east-west traffic patterns
• Storage area networks (SAN) that need fast, reliable fiber links
• High performance computing clusters where low latency is critical

This Dell SolarFlare transceiver combines robust build quality with industry-leading performance, making it an ideal choice for organizations looking to scale bandwidth while maintaining operational efficiency.