Cisco QSFP-40G-LR4 Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 40GBASE-LR4 QSFP+ CWDM Single-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:QSFP-40G-LR4
Naming Breakdown
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QSFP+: Quad Small Form-factor Pluggable hot‑swappable transceiver compliant with SFF‑8436 QSFP+ MSA specification
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40G: Aggregate 41.2 Gbps data rate for 40 Gigabit Ethernet
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LR4: Long Reach 4-channel CWDM multiplexed transmission; IEEE 802.3ba 40GBASE-LR4 standard
Critical Note: Integrates internal optical MUX/DEMUX; uses duplex LC single-mode fiber.This module cannot support 4×10G breakout operation.
Core Product Positioning
The Cisco QSFP-40G-LR4 is a hot‑swappable commercial-grade QSFP+ optical transceiver designed for medium-distance 40 Gigabit Ethernet transmission over standard single-mode fiber. Four independent 10G electrical lanes are multiplexed onto four distinct CWDM wavelengths and transmitted over a single pair of SMF. Optimized for data center inter-facility links, enterprise core backbone connections, and service provider metro aggregation networks. Integrated DOM/DDM delivers continuous real-time monitoring of all critical optical operating parameters. Supports both 40GBASE Ethernet and OTU‑3 transport rates.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Nexus 7000 / 9000 Series Switches; Catalyst 9000 Series Switches; ASR 1000 Series Routers; UCS Fabric Interconnects and all other platforms equipped with QSFP+ interfaces supporting 40 Gigabit Ethernet.
Verify Cisco official transceiver compatibility matrix and minimum firmware release before deployment.
Supported Operating Systems
NX-OS, IOS-XE releases supporting QSFP+ MSA and SFF‑8472 digital diagnostic monitoring functions.
Supported Fiber Type
Single‑Mode Fiber (SMF) G.652 (9/125μm) only; incompatible with multi-mode fiber.
Connector
Duplex LC optical connector.
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable QSFP+, compliant with SFF‑8436 MSA
Optical Interface
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CWDM Channel Wavelengths: 1271 nm, 1291 nm, 1311 nm, 1331 nm
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Supported Bit Rate: 4 independent ×10.3125 Gbps channels, aggregate 41.2 Gbps (40GBASE-LR4 Ethernet); also supports OTU‑3
Maximum Transmission Reach
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Up to10 kmover standard G.652 single-mode fiber
Optical Power Budget (per lane)
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Average Transmit Optical Power: -7.0 dBm ~ +2.3 dBm
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Receiver Sensitivity: Minimum -13.7 dBm
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Maximum Allowable Received Power: +2.3 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors module internal temperature, supply voltage, laser bias current, transmit optical power and receive optical power.
Environmental Operating Parameters (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
Transport Support
Wire-speed full-duplex native 40GBASE-LR4 Ethernet; OTU‑3 compliant;4×10G breakout mode NOT supported
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) 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 / IOS-XE CLI, SSH, SNMP v2c/v3, Syslog logging
5. Typical Deployment Scenarios
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Inter-data-center 40GE point-to-point connections up to 10 km over single-mode fiber
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Enterprise metropolitan core backbone high-speed interconnections
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Service provider metro aggregation and carrier-grade transport links
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Campus-wide long-distance 40G core network deployment
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Network lab and test bench 40G long-reach single-mode testing
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 per IEC 60825‑1
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Industry Standards: IEEE 802.3ba, SFF‑8436, SFF‑8472
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Environmental: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco QSFP-40G-LR4 QSFP+ Optical Transceiver
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Hardware installation guide
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Safety and regulatory documentation
Duplex LC single-mode fiber patch cables sold separately. Breakout cabling cannot be used to split to 10G ports with this module.
Model Comparison Reference
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QSFP-40G-LR4: Commercial temp, CWDM SMF 10km, duplex LC, native 40G only
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QSFP-40G-LR4-S: S-class variant, identical optical reach, feature-limited platform support
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QSFP-40G-ER4: Extended-reach 40km single-mode QSFP+ transceiver
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QSFP-40G-SR4: Multi-mode parallel MPO short-reach QSFP+ module
UNSPSC Classification Code
43222618 – Cisco QSFP-40G-LR4 CWDM long-reach single-mode QSFP+ transceiver with DOM, hot‑swappable 40 Gigabit optical module for data center interconnection, enterprise backbone and metro networking.
Hardware Warranty
Original Cisco transceivers are covered under Cisco limited hardware warranty; refurbished units follow respective reseller warranty terms.
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