STC-40004 | 400G QSFP112 DR4 LPO Optical Transceiver

Product Overview

The STC-40004 from Swedish Telecom Opto’s LPO Series is a 400 Gb/s QSFP112 DR4 module engineered for energy-efficient short-reach links over single-mode fiber (SMF). Designed on a Linear Pluggable Optics (LPO) architecture, it eliminates the need for a DSP inside the module, shifting signal processing to the host ASIC. This delivers significant reductions in power consumption and latency, making it ideal for data-centre leaf-spine interconnects, AI/ML clusters, and HPC environments where efficiency per watt is crucial.

The STC-40004 supports 4 × 100 Gb/s PAM4 lanes across an aggregate 400 Gb/s data rate, reaching up to 500 m over SMF. Built to comply with IEEE 802.3bs 400GBASE-DR4, it ensures seamless interoperability with compatible linear-drive hosts supporting CEI-112G-LINEAR-PAM4.

Key Features

• 400 Gb/s aggregate throughput using 4 × PAM4 lanes (100 G each)
• Linear-drive (LPO) design without DSP for ultra-low latency
• Up to 500 m transmission distance over single-mode fiber
• ≤ 6 W power consumption — up to 30 % lower than DSP-based designs
• Compliant with IEEE 802.3bs 400GBASE-DR4
• CMIS 4.0 compatible management interface
• Hot-pluggable QSFP112 form factor
• Operating temperature: 0 °C – 70 °C
• +3.3 V single power supply
• RoHS 2.0 compliant and EU-tested

Applications

• 400 G Ethernet leaf-spine data-centre fabrics
• Intra-data-centre and rack-to-rack connectivity
• AI/ML training clusters with latency sensitivity
• High-performance computing (HPC) and cloud infrastructures
• Energy-efficient 400 G upgrades in enterprise networks

Standards & Compliance

• IEEE 802.3bs 400GBASE-DR4
• CEI-112G-LINEAR-PAM4 electrical specification
• CMIS 4.0 management interface
• QSFP112 MSA
• RoHS 2.0 compliant

Specifications

Why Choose EU-Tested LPO Modules

All Swedish Telecom Opto LPO modules are independently tested in European laboratories for power, thermal, and interoperability performance. This ensures predictable deployment, regional compliance, and fast logistics within the EU — key advantages for hyperscale and telecom operators.