Cisco QSFP-40G-SM-SR Full Official Product Description
Important Clarification: Cisco doesnotpublish an official original factory part number named QSFP-40G-SM-SR. This naming is widely used in the industry to reference40GBASE-PLR4 / 40GBASE-LX4 style short-reach single-mode QSFP+ transceiver, supporting up to 2km over G.652 single-mode fiber, duplex LC interface. It is the 40G single-mode short-reach counterpart of multi-mode QSFP-40G-SR4.
1. Part Number & Naming Definition
Full Commercial Name
Cisco Compatible 40GBASE SM-SR QSFP+ Short-Reach Single-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU Alias:QSFP-40G-SM-SR
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 bandwidth for 40 Gigabit Ethernet (4 × 10.3125 Gbps electrical lanes)
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SM: Single-Mode Fiber operation
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SR: Short Reach (2km maximum transmission distance over SMF)
Core Architecture: Four parallel 10G optical channels at 1310nm wavelength, transmitted over a single duplex LC single-mode fiber pair.
Critical Restriction:4×10G breakout function NOT supported. Native 40G Ethernet operation only.
Core Product Positioning
The QSFP-40G-SM-SR is a commercial-grade hot‑swappable QSFP+ optical transceiver designed for short-haul 40 Gigabit Ethernet transmission over standard G.652 single-mode fiber. It fills the gap between multi-mode 40G transceivers (SR4 / CSR4) and 10km LR4 modules, ideal for intra-data-center single-mode fiber runs up to 2km. It enables operators to deploy 40G over existing short single-mode fiber links without upgrading to longer-reach higher-cost LR4 optics. Integrated DOM/DDM delivers continuous real-time monitoring of critical optical operational 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 other network hardware equipped with QSFP+ ports supporting 40 Gigabit Ethernet.
Verify transceiver compatibility matrix and minimum required firmware release before deployment.
Supported Operating Systems
NX-OS, IOS-XE releases supporting QSFP+ MSA and SFF‑8472 digital diagnostic monitoring functions.
Supported Fiber Media
Single‑Mode Fiber (SMF) G.652 (9/125μm) only; incompatible with multi-mode fiber.
Connector Type
Duplex LC UPC optical connector
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable QSFP+, compliant with SFF‑8436 MSA
Optical Interface
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Operating Wavelength: 1260 nm ~ 1310 nm (nominal 1310 nm)
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Electrical Lane Rate: 4 × 10.3125 Gbps, aggregate 41.2 Gbps
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Operating Mode: Native 40G only; breakout function disabled
Maximum Transmission Distance
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Up to2 kmover standard G.652 single-mode fiber
Optical Power Budget (per individual lane)
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Average Transmit Optical Power: -6.5 dBm ~ +0.5 dBm
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Minimum Receiver Sensitivity: -14.0 dBm
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Maximum Allowable Received Optical Power: +0.5 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors internal module temperature, supply voltage, laser bias current, transmit optical power and receive optical power.
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 native 40GBASE Ethernet;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) 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 / IOS-XE command-line interface, SSH, SNMP v2c/v3, Syslog logging
5. Typical Deployment Scenarios
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Intra-data-center 40GE interconnections over short single-mode fiber links within 2km
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Building-to-building campus 40G backbone connections with moderate fiber distances
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Migration projects utilizing existing short single-mode fiber infrastructure instead of multi-mode recabling
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Cost-sensitive deployments where 10km LR4 optical power margin is unnecessary
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Cloud and enterprise data center leaf-spine fabric short single-mode uplinks
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: SFF‑8436, SFF‑8472
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Environmental Regulation: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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QSFP-40G-SM-SR 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 split this module into independent 10G ports.
Model Comparison Reference
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QSFP-40G-SM-SR: Duplex LC SMF, 2km reach, native 40G only, no breakout
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QSFP-40G-LR4 / LR4-S: Duplex LC SMF CWDM, 10km reach
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QSFP-40G-ER4-Lite: Duplex LC SMF CWDM, 20km reach
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QSFP-40G-SR4 / CSR4: MPO multi-mode parallel optics
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QSFP-40G-SR-BD: Duplex LC multi-mode BiDi short-reach transceiver
UNSPSC Classification Code
43222618 – QSFP-40G-SM-SR short-reach single-mode QSFP+ transceiver with DOM, hot-swappable 40 Gigabit optical module for economical intra-data-center and campus short-distance single-mode 40G Ethernet networking.
Hardware Warranty
Genuine Cisco OEM transceivers follow Cisco limited hardware warranty. Third-party compatible transceiver warranty terms follow respective reseller agreements.
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