• Green and silver Cisco QSFP-400G-FR4 pcie expansion card with black label for 400G single-mode transceiver use
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Cisco

Cisco QSFP-400G-FR4 | 400G Transceiver, Single-Mode, 2km, Duplex LC

QSFP-400G-FR4

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Description

The Cisco QSFP-400G-FR4 is a 400 Gigabit Ethernet transceiver designed for data center and enterprise deployments over single-mode fiber. Using four 100G PAM4 CWDM wavelengths multiplexed onto a duplex LC fiber pair, it delivers 400G connectivity up to 2 kilometers while simplifying fiber infrastructure compared to parallel optics. Compliant with IEEE 400GBASE-FR4 standards, this hot-pluggable module is ideal for spine-leaf architectures, high-performance computing, and AI networking fabrics.

Features

IEEE 802.3bs 400GBASE-FR4 compliant for standards-based interoperability
- Four 100G PAM4 optical lanes multiplexed via CWDM technology
- Duplex LC connector reduces fiber complexity versus parallel optics
- Hot-pluggable QSFP112 form factor for easy installation without downtime
- Digital Diagnostic Monitoring (DDM) for real-time performance tracking
- Low-power operation suitable for high-density deployments
- Clock and Data Recovery (CDR) on all electrical lanes
- RoHS compliant and Class 1 laser safety certified
- Optimized for AI/ML fabrics, cloud networking, and data center spine-leaf architectures
- Supports migration from existing duplex single-mode fiber infrastructure
- Commercial temperature range (0°C to 70°C) operation
- Single 3.3V power supply requirement

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Datasheet

Technical Specifications

Form Factor: QSFP112 (QSFP-DD compatible)
- Data Rate: 400 Gbps
- Connector: Duplex LC/UPC
- Fiber Type: Single-Mode Fiber (SMF)
- Wavelengths: 1271, 1291, 1311, 1331 nm CWDM
- Maximum Reach: 2 kilometers (G.652 SMF)
- Modulation: PAM4 (106.25 Gbps per optical lane)
- Electrical Interface: 4x 100G PAM4 (400GAUI-4)
- Power Consumption: Typical 10W maximum
- Operating Temperature: 0°C to 70°C (commercial)
- Power Supply: Single 3.3V
- Standards Compliance: IEEE 802.3bs 400GBASE-FR4, 100G Lambda MSA
- Management Interface: CMIS (Common Management Interface Specification)
- Digital Diagnostics: DDM/DOM support for real-time monitoring

FAQs

Q: What is the maximum transmission distance for the QSFP-400G-FR4?
A: The QSFP-400G-FR4 supports link lengths up to 2 kilometers over standard G.652 single-mode fiber with duplex LC connectors, making it suitable for intra-data center and campus interconnects.

Q: What wavelengths does this transceiver use?
A: The module uses four CWDM wavelengths at 1271, 1291, 1311, and 1331 nm, each carrying 100G PAM4 signals multiplexed onto a single duplex fiber pair for efficient 400G transmission.

Q: Is Forward Error Correction (FEC) required?
A: Yes, KP4 RS-FEC (RS(544,514)) is required for 400G operation and is typically handled by the host switch ASIC. Ensure your platform supports and enables KP4 FEC on QSFP-DD interfaces.

Q: What platforms support the QSFP-400G-FR4?
A: This module is compatible with Cisco platforms including Nexus 9300-GX2, Nexus 9500-EX/FX3, Catalyst 9500X, Cisco 8000 series, and other QSFP112/QSFP-DD compliant ports. Verify compatibility with your specific hardware and software version.

Q: How does FR4 compare to DR4 for fiber usage?
A: FR4 uses a duplex LC connector (2 fibers) with wavelength multiplexing, while DR4 uses an MPO-12 connector (8 active fibers). FR4 reduces fiber count and simplifies migration from existing duplex fiber infrastructure.

Datasheet

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