Cisco QSFP-40G-ER4-Lite Full Official Product Description
Important Note: Cisco official part numberQSFP-40G-ER4-Lite. Lite variant offers reduced optical power budget versus standard QSFP-40G-ER4, optimized for shorter metro single-mode fiber links.4×10G breakout is not supported.
1. Part Number & Naming Definition
Official Full Name
Cisco 40GBASE-ER4-Lite QSFP+ CWDM Single-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:QSFP-40G-ER4-Lite
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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ER4-Lite: Extended Reach Lite, four-channel CWDM multiplexed transmission
Core Architecture: Built-in MUX/DEMUX multiplexes four electrical lanes onto four CWDM wavelengths and transmits over one duplex single-mode fiber pair.
Key Differences vs standard QSFP-40G-ER4: Lower transmit optical power, shorter maximum transmission reach; native 40G Ethernet only,no OTU‑3 carrier transport capability.
Critical Restriction:4×10G breakout function NOT supported.
Core Product Positioning
The Cisco QSFP-40G-ER4-Lite is commercial-grade hot‑swappable QSFP+ optical transceiver designed for medium-long haul 40 Gigabit Ethernet over G.652 single-mode fiber. It is cost-optimized for enterprise metro inter-building connections, intra-metro data center interlinks and campus core backbone deployments where full 40km ER4 performance margin is unnecessary. Integrated DOM/DDM enables continuous real-time monitoring of optical parameters for simplified operation and fault troubleshooting.
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 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
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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CWDM Channel Wavelengths: 1271 nm, 1291 nm, 1311 nm, 1331 nm
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Electrical Lane Rate: 4 × 10.3125 Gbps, aggregate 41.2 Gbps
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Supported Rate: Native 40GBASE Ethernet only;OTU‑3 unsupported
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Operating Mode: Native 40G only; breakout function disabled
Maximum Transmission Distance
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Up to20 kmover standard G.652 single-mode fiber
Optical Power Budget (per individual lane)
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Average Transmit Optical Power: -4.0 dBm ~ +2.0 dBm
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Minimum Receiver Sensitivity: -18.0 dBm
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Maximum Allowable Received Optical Power: -1.0 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 Ethernet only;OTU‑3 and 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-metro point-to-point 40GE interconnections between enterprise data centers within 20km range
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Metropolitan enterprise core inter-building backbone fiber links
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Campus-wide long-distance 40G core network over single-mode fiber
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Non-carrier data center inter-facility links without OTU‑3 transport requirements
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Cost-sensitive medium-reach 40G single-mode projects where standard 40km ER4 margin is excessive
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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Cisco QSFP-40G-ER4-Lite 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-ER4-Lite: Duplex LC SMF CWDM, 20km reach, native 40G only, no OTU‑3, low transmit power
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QSFP-40G-ER4: Duplex LC SMF CWDM, 40km reach, supports 40G Ethernet + OTU‑3
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QSFP-40G-LR4: Duplex LC SMF CWDM, 10km reach, supports 40G Ethernet + OTU‑3
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QSFP-40G-LR4-S: Enterprise variant, 10km SMF, native 40G only, no OTU‑3
UNSPSC Classification Code
43222618 – Cisco QSFP-40G-ER4-Lite CWDM medium-reach single-mode QSFP+ transceiver with DOM, hot-swappable 40 Gigabit optical module for cost-effective enterprise metro and campus 40G Ethernet networking.
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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