Cisco QSFP-400G-LR4 Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 400GBASE-LR4 QSFP112 CWDM Single-Mode Optical Transceiver Module with Digital Diagnostic Monitoring Support
SKU:QSFP-400G-LR4
Naming Breakdown
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QSFP112: Quad Small Form-factor Pluggable 112 hot‑swappable transceiver compliant with QSFP112 MSA and CMIS Rev4.1 standard
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400G: Aggregate 425 Gbps raw bandwidth (4 × 106.25 GBd PAM4 electrical lanes for 400 Gigabit Ethernet payload)
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LR4: Long Reach four-channel CWDM optical standard defined under IEEE 802.3cu 400GBASE-LR4, supporting up to 10 km transmission over single-mode fiber
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No suffix: Standard commercial temperature-grade variant (0°C ~ +70°C operating range)
Core Architecture
Four independent 106.25 GBd PAM4 optical lanes following CWDM wavelength grid: 1271 nm, 1291 nm, 1311 nm, 1331 nm. Integrated optical multiplexer and demultiplexer combine four optical signals onto one duplex single-mode fiber pair. Utilizes cooled EML transmitters and high-sensitivity PIN receiver arrays.
Mandatory requirement: Host-side KP4 RS-FEC must be enabled to achieve full 10 km transmission distance and target bit error rate performance.
Critical restriction:No electrical breakout capability. Operates exclusively as native aggregated 400G link.
Core Product Positioning
The Cisco QSFP-400G-LR4 is a commercial-grade hot‑swappable QSFP112 optical transceiver engineered for long-reach 400 Gigabit Ethernet connections. It operates over standard duplex LC single-mode fiber infrastructure, requiring only two fiber strands. This module is ideal for long-distance intra-data-center interconnections, data center interconnect (DCI) between geographically separated campus facilities, inter-building enterprise backbone links, and carrier-grade metro transport networking. Built-in digital diagnostics deliver continuous real-time monitoring of optical operating parameters to simplify routine maintenance and accelerate fault troubleshooting.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Nexus 9000 Series QSFP112-enabled Switches; high-density Catalyst switching platforms; UCS servers and other hardware platforms equipped with QSFP112 ports supporting 400 Gigabit Ethernet.
Verify Cisco official transceiver compatibility matrix and minimum required firmware release prior to deployment.
Supported Operating Systems
NX-OS releases supporting QSFP112 MSA, CMIS Rev4.1 and digital diagnostic interfaces.
Supported Fiber Media
Single‑Mode Fiber (SMF) G.652 (OS2, 9/125μm) only; incompatible with multi-mode fiber.
Connector Type
Duplex LC UPC optical connector
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable QSFP112, compliant with QSFP112 MSA and CMIS Rev4.1
Optical Interface
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CWDM Wavelength Grid: 1271 nm, 1291 nm, 1311 nm, 1331 nm
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Electrical Interface: 400GAUI‑4, 4 × 106.25 GBd PAM4
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Modulation Scheme: PAM4
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Transmitter: Cooled EML array; Receiver: PIN photodiode array
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Mandatory Function: Host KP4 RS‑FEC activation
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Operating Mode: Native 400G only; breakout function disabled
Maximum Transmission Distance
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Up to10 kmover standard G.652 OS2 single-mode fiber (RS‑FEC enabled)
Optical Power Budget
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Average Transmit Optical Power: −2.7 dBm ~ +4.4 dBm
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Minimum Receiver Sensitivity (OMA): −6.8 dBm
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Maximum Allowable Received Optical Power: +5.1 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors internal module temperature, supply voltage, laser bias current, transmit optical power and received optical power via I2C CMIS interface.
Environmental Specifications (Commercial Grade)
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Operating Temperature:0°C ~ +70°C (32°F ~ 158°F)
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Storage Temperature: −40°C ~ +85°C (−40°F ~ 185°F)
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Relative Humidity: 5% – 95%, non‑condensing
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Maximum Operating Altitude: 3,000 meters
Typical Power Consumption
4. Supported Functional Capabilities
Ethernet Transport
Wire-speed full-duplex 400GBASE-LR4 PAM4 Ethernet; requires host KP4 RS-FEC; no electrical breakout capability.
Layer 2 Protocol Support
802.1Q VLAN trunking, IEEE 802.3x pause frame flow control, LACP, STP/RSTP/MSTP, EtherChannel link aggregation
Interface Diagnostics
Link status detection, error statistics, DOM real-time optical telemetry, LOS (Loss of Signal) alarm indication, Tx disable control, local loopback testing
High Availability
Supports hot-plug OIR (Online Insertion and Removal) on compatible platforms; supports link redundancy via port-channels and spanning tree protocols
Operations & Management
NX-OS command-line interface, SSH, SNMP v2c/v3, Syslog logging
5. Typical Deployment Scenarios
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Long-distance 400GE intra-data-center fabric uplinks spanning up to 10 km
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Data Center Interconnect (DCI) between geographically separate data center campuses
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Enterprise inter-building backbone transport over long single-mode fiber runs
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Service provider metro aggregation and mobile core transport networks
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Remote cloud zone interconnections leveraging existing duplex LC OS2 single-mode fiber infrastructure
6. Regulatory & Compliance Certifications
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Safety Standards: UL 60950‑1, IEC/EN 60950‑1, CSA C22.2 No.60950‑1
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EMC Compliance: CE Mark, FCC Part 15 Class A, ICES‑003 Class A
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Laser Safety: Class 1 Laser Product conforming to IEC 60825‑1
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Industry Standards: IEEE 802.3cu, IEEE 802.3ck, QSFP112 MSA, CMIS Rev4.1, SFF‑8636
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Environmental Regulation: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco QSFP-400G-LR4 QSFP112 Optical Transceiver
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Hardware Installation Guide
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Safety and Regulatory Documentation
Duplex LC single-mode patch cords sold separately. Cannot be electrically split into independent 100G channels.
Model Comparison Reference
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QSFP-400G-LR4: QSFP112 Duplex LC CWDM SMF, max 10km, native 400G only, two-fiber duplex design
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QSFP-400G-FR4: QSFP112 Duplex LC CWDM SMF, max 2km, medium-reach intra-DC links
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QSFP-400G-DR4: QSFP112 MPO‑12 APC parallel single-mode, max 500m, supports 4×100G breakout
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QSFP-400G-VR4: QSFP112 MPO‑12 UPC multi-mode parallel optics, max 50m, rack short-reach
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QDD-400G-LR4-S: QSFP-DD form factor LR4 module with different hardware footprint
UNSPSC Classification Code
43222618 – Cisco QSFP-400G-LR4 long-reach CWDM single-mode QSFP112 transceiver with DOM, hot-swappable 400 Gigabit optical module for cloud, enterprise, metro carrier, long-distance DCI and campus backbone networking.
Hardware Warranty
Genuine Cisco transceivers are covered under Cisco limited hardware warranty. Warranty terms for refurbished units follow respective reseller agreements.
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