Cisco QSFP-40G-LR4-S 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-S
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
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S: Standard enterprise-grade variant; native 40G operation only,no OTU‑3 transport support and cannot perform 4×10G breakout
Core Product Positioning
The Cisco QSFP-40G-LR4-S is a hot‑swappable commercial-grade QSFP+ optical transceiver engineered for medium-distance 40 Gigabit Ethernet transmission over standard single-mode fiber. Four independent 10 Gbps electrical lanes are multiplexed onto four CWDM wavelengths and transmitted over one duplex SMF pair. Differentiated from standard QSFP-40G-LR4, this S-class model omits OTU‑3 carrier transport functionality and only supports native 40G Ethernet. Optimized for enterprise core backbones, campus metro interconnections and data center point-to-point links where carrier transport is not required. Integrated DOM/DDM delivers continuous real-time monitoring of critical optical operating parameters.
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)
Restriction:No OTU‑3 support; 4×10G breakout mode NOT available.
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 only;OTU‑3 disabled; 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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Point-to-point 40GE interconnections between separate enterprise data centers up to 10 km
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Metropolitan enterprise core backbone high-speed inter-building links
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Campus-wide long-distance 40G core networking without carrier transport demands
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Non-carrier data center inter-facility 40G fiber links
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Enterprise network laboratory 40G single-mode testing environments
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-S 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 independent 10G ports with this module.
Model Comparison Reference
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QSFP-40G-LR4-S: Commercial temp, CWDM SMF 10km, duplex LC, native 40G only,no OTU-3 support
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QSFP-40G-LR4: Standard model, identical optical specs, supports 40GBASE-LR4 + OTU‑3 transport
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QSFP-40G-ER4: Extended-reach 40 km single-mode QSFP+ transceiver
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QSFP-40G-SR4-S: MPO multi-mode short-reach QSFP+ transceiver without breakout capability
UNSPSC Classification Code
43222618 – Cisco QSFP-40G-LR4-S CWDM long-reach single-mode QSFP+ transceiver with DOM, hot‑swappable 40 Gigabit optical module for enterprise and data center 40G Ethernet networking without carrier transport requirements.
Hardware Warranty
Original Cisco transceivers are covered under Cisco limited hardware warranty; refurbished units follow respective reseller warranty terms.
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