Cisco QSFP-40G-SR4 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
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
Key Feature: Supports dual operating modes – native 40GBASE-SR4 or breakout into 4 independent 10GBASE-SR channels via MPO breakout cables.
Core Product Positioning
The Cisco QSFP-40G-SR4 is a hot‑swappable commercial-grade QSFP+ parallel optical transceiver designed for short-reach 40 Gigabit Ethernet transmission over laser-optimized multi-mode ribbon fiber. Optimized for leaf-spine data center architectures, top-of-rack switch uplinks, high-performance computing (HPC) clusters and cloud interconnections. It enables flexible network migration via 4×10G breakout capability to reuse existing 10G optical infrastructure. Integrated DOM/DDM delivers continuous real-time monitoring of all 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)
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
Distance specifications apply for both 40G full-rate mode and 4×10G breakout mode.
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 40GBASE-SR4 Ethernet; supports 4×10GBASE-SR breakout mode
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 inter-switch uplinks over parallel ribbon fiber
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Top-of-rack switch 40G aggregation uplinks within server rooms
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HPC cluster high-density low-latency interconnections
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Cost-effective network migration: 40G port breakout to four independent 10G links
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Cloud data center and enterprise campus short-range high-speed interconnections
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 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 and MPO-to-4×LC breakout cables sold separately.
Model Comparison Reference
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QSFP-40G-SR4: Commercial temperature, MMF 100m/150m, supports 4×10G breakout
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QSFP-40G-SR4-S: Enterprise class SR4 module,no breakout support
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QSFP-40G-CSR4: Extended multi-mode reach up to 300m/400m
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QSFP-40G-LR4: 10km single-mode LC duplex 40G transceiver
UNSPSC Classification Code
43222618 – Cisco QSFP-40G-SR4 parallel short-reach multi-mode QSFP+ transceiver with DOM and breakout capability, hot‑swappable 40 Gigabit optical module for modern leaf-spine data center networking.
Hardware Warranty
Original Cisco transceivers are covered under Cisco limited hardware warranty; refurbished units follow respective reseller warranty terms.
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