Cisco QSFP-40G-SR4-S Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 40GBASE-SR4 QSFP+ Parallel Multi-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:QSFP-40G-SR4-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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SR4: Short Reach 4-channel parallel optical transmission, IEEE 802.3ba 40GBASE-SR4 standard
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S: Standard enterprise-grade variant;designed only for native 40G operation, NO 4×10G breakout capability
Core Product Positioning
The Cisco QSFP-40G-SR4-S is a hot‑swappable commercial-grade QSFP+ parallel optical transceiver built exclusively for native 40 Gigabit Ethernet transmission over laser-optimized multi-mode ribbon fiber. Optimized for leaf-spine data center fabric interconnections, cloud aggregation uplinks and high-performance computing clusters where breakout functionality is unnecessary. Distinguished from standard QSFP-40G-SR4, this enterprise S variantdoes not support 4×10G breakout mode. 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
Laser-optimized 50/125μm multi-mode fiber (MMF) only. Incompatible with single-mode fiber.
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OM3 MMF: maximum 100 meters
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OM4 / OM5 MMF: maximum 150 meters
Connector
MPO/MTP-12 female multi-fiber parallel optical connector.
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable QSFP+, compliant with SFF‑8436 MSA
Optical Interface
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Transmit Wavelength: 840 nm ~ 860 nm, nominal 850 nm VCSEL Laser Array
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Receive Wavelength: 840 nm ~ 860 nm
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Supported Bit Rate: 4 independent ×10.3125 Gbps channels, aggregate 41.2 Gbps (40GBASE-SR4 Ethernet)
Note: Operates only in native 40G mode; breakout to four separate 10G ports is not supported.
Maximum Transmission Reach
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OM3 Multi-Mode Fiber: up to 100 m
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OM4 / OM5 Multi-Mode Fiber: up to 150 m
Optical Power Budget
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Average Transmit Optical Power: -7.6 dBm ~ +2.4 dBm
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Receiver Sensitivity: Minimum -11.1 dBm
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Maximum Allowable Received Power: +0.5 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
Ethernet Transport
Wire-speed full-duplex native 40GBASE-SR4 Ethernet;4×10G breakout mode not available
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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Leaf‑spine data center 40GE fabric inter-switch uplinks over MPO ribbon fiber
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Cloud data center aggregation layer high-density 40G interconnections
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HPC cluster low-latency parallel fiber networking without breakout requirements
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Enterprise core data center high-speed backbone links
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Network lab 40G test environments where 10G breakout is not required
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-SR4-S QSFP+ Optical Transceiver
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Hardware installation guide
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Safety and regulatory documentation
MPO/MTP-12 multi-mode ribbon patch cables sold separately. Breakout cables cannot be utilized for 10G connectivity with this module.
Model Comparison Reference
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QSFP-40G-SR4-S: Commercial temp, MMF 100m/150m, native 40G only,NO breakout support
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QSFP-40G-SR4: Standard model, identical optical reach, supports native 40Gand 4×10G breakout
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QSFP-40G-CSR4: Extended-reach multi-mode QSFP+ module
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QSFP-40G-LR4: Duplex LC 10km single-mode 40G transceiver
UNSPSC Classification Code
43222618 – Cisco QSFP-40G-SR4-S parallel short-reach multi-mode QSFP+ transceiver with DOM, hot‑swappable 40 Gigabit optical module for enterprise and cloud data center 40G fabric deployments without breakout needs.
Hardware Warranty
Original Cisco transceivers are covered under Cisco limited hardware warranty; refurbished units follow respective reseller warranty terms.
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