Cisco QSFP-40G-CSR4 Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 40GBASE-CSR4 QSFP+ Extended Reach Parallel Multi-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:QSFP-40G-CSR4
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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CSR4: Compact Short Reach 4-channel parallel optical transmission, extended reach variant based on IEEE 802.3ba 40GBASE-SR4 architecture
Core Feature: Supports dual operating modes — native 40GBASE-CSR4 or breakout into four independent 10GBASE-SR channels by deploying MPO-to-4×LC breakout cables. Each optical lane fully complies with 10GBASE-SR standards.
Core Product Positioning
The Cisco QSFP-40G-CSR4 is a commercial-grade hot‑swappable QSFP+ parallel optical transceiver delivering extended-reach 40 Gigabit Ethernet over laser-optimized parallel multi-mode ribbon fiber. Compared with standard QSFP-40G-SR4, it provides significantly longer transmission distances on OM3 / OM4 / OM5 MMF. Optimized for large leaf-spine data center fabrics, cloud aggregation uplinks, high-performance computing clusters and enterprise campus core networks. Integrated DOM/DDM enables 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 other hardware equipped with QSFP+ interfaces supporting 40 Gigabit Ethernet.
Verify Cisco official transceiver compatibility matrix and minimum required firmware release prior to deployment.
Supported Operating Systems
NX-OS, IOS-XE releases supporting QSFP+ MSA and SFF‑8472 digital diagnostic monitoring functions.
Supported Fiber Media
Laser-optimized 50/125μm multi-mode fiber (MMF) only. Incompatible with single-mode fiber.
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OM3 MMF: maximum reach of 300 meters
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OM4 / OM5 MMF: maximum reach of 400 meters
Connector Type
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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Operating Wavelength: 840 nm ~ 860 nm (nominal 850 nm VCSEL array)
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Electrical Lane Rate: 4 × 10.3125 Gbps, aggregate 41.2 Gbps (40GBASE Ethernet)
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Dual Operation Modes: Native 40G or 4×10GBASE-SR breakout
Maximum Transmission Distance
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OM3 Multi-Mode Fiber: up to 300 m
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OM4 / OM5 Multi-Mode Fiber: up to 400 m
Optical Power Budget (per individual lane)
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Average Transmit Optical Power: -7.3 dBm ~ 0 dBm
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Minimum Receiver Sensitivity: -9.9 dBm
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Maximum Allowable Received Optical Power: 0 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-CSR4 Ethernet; supports flexible 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) 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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Long-distance 40GE inter-switch uplinks inside large leaf-spine data center fabrics
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High-density HPC cluster interconnections requiring extended multi-mode fiber reach
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Data center aggregation layer backbone links over long MMF cable runs
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Migration projects: 40G QSFP port breakout to four independent 10G SFP+ links
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Enterprise campus core networking utilizing long parallel multi-mode fiber routes
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: IEEE 802.3ba, SFF‑8436, SFF‑8472
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Environmental Regulation: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco QSFP-40G-CSR4 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-CSR4: Extended reach MPO MMF, 300m (OM3) / 400m (OM4), supports native 40G and 4×10G breakout
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QSFP-40G-SR4: Standard short-reach MPO MMF, 100m/150m, breakout supported
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QSFP-40G-SR4-S: SR4 enterprise variant, native 40G only, no breakout capability
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QSFP-40G-SR-BD: Duplex LC BiDi multi-mode transceiver, no breakout support
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QSFP-40G-LR4: Duplex LC single-mode 10km CWDM QSFP+ module
UNSPSC Classification Code
43222618 – Cisco QSFP-40G-CSR4 extended-reach parallel multi-mode QSFP+ transceiver with DOM and breakout capability, hot-swappable 40 Gigabit optical module for large-scale data center and HPC networking requiring longer multi-mode fiber transmission distances.
Hardware Warranty
Genuine Cisco transceivers are covered under Cisco limited hardware warranty. Warranty terms for refurbished units follow respective reseller agreements.
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