Cisco QSFP-100G-ER4L-S Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 100GBASE-ER4 Lite QSFP28 LAN WDM Single-Mode Optical Transceiver Module with Digital Diagnostic Monitoring Support
SKU:QSFP-100G-ER4L-S
Naming Breakdown
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QSFP28: Quad Small Form-factor Pluggable 28 hot‑swappable transceiver compliant with SFF‑8665 QSFP28 MSA specification
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100G: Aggregate 103.125 Gbps bandwidth (4 × 25.78125 Gbps NRZ electrical lanes for CAUI-4)
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ER4L: ER4 Lite extended reach 4-channel LAN WDM optical standard
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S: Commercial temperature grade variant (0°C ~ +70°C operating range)
Core Architecture:
Four independent 25G NRZ EML optical channels utilizing LAN WDM wavelength grid (1295.56 nm, 1300.05 nm, 1304.58 nm, 1309.14 nm). All four optical lanes are multiplexed and transmitted over one duplex LC single-mode fiber pair. Equipped with high-sensitivity APD receivers.
Key Link Distance Rule: Up to30 km without FEC, up to40 km with FEC enabledover G.652 OS2 single-mode fiber.
Critical Restriction:4×25G electrical breakout is NOT supported; only native 100G operation.
Core Product Positioning
The Cisco QSFP-100G-ER4L-S is a commercial-grade hot‑swappable QSFP28 optical transceiver designed for extended-reach 100 Gigabit Ethernet connections. It fills the performance gap between 10 km LR4 and 80 km ZR4 transceivers, ideal for inter-data-center, metro campus, and enterprise long-distance single-mode fiber links. Integrated DOM/DDM enables continuous real-time monitoring of optical operating parameters to simplify routine maintenance and rapid fault troubleshooting.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Nexus 3000 / 9000 Series Switches; Catalyst 9500 / 9600 Series Switches; ASR 1000 Series Routers, UCS servers and other hardware equipped with QSFP28 ports supporting 100 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 QSFP28 MSA and SFF‑8636 digital diagnostic monitoring functions.
Supported Fiber Media
Single‑Mode Fiber (SMF) G.652 (OS2, 9/125μm) only; incompatible with multi-mode fiber.
Connector Type
Duplex LC UPC optical connector
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable QSFP28, compliant with SFF‑8665 MSA
Optical Interface
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LAN WDM Wavelength Grid: 1295.56 nm, 1300.05 nm, 1304.58 nm, 1309.14 nm
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Electrical Lane Rate: 4 × 25.78125 Gbps NRZ, aggregate 103.125 Gbps
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Transmitter: Cooled EML; Receiver: APD
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Operating Mode: Native 100G only; breakout function disabled
Maximum Transmission Distance
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30 km over G.652 SMF (FEC Disabled)
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40 km over G.652 SMF (FEC Enabled)
Optical Power Budget (per individual lane)
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Average Transmit Optical Power: -2.9 dBm ~ +4.5 dBm
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Minimum Receiver Sensitivity: -17 dBm (No FEC), -21 dBm (With FEC)
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Maximum Allowable Received Optical Power: +3.3 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 100GBASE Ethernet; supports optional host-side FEC to achieve maximum 40 km reach; no breakout capability.
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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Point-to-point 100GE interconnections between geographically separated data centers within 40 km range
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Metropolitan enterprise inter-building core backbone single-mode fiber links
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Large campus long-distance 100G core network deployments over OS2 single-mode fiber
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Cloud service provider metro data center peering and aggregation connections
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Enterprise WAN edge high-speed 100G aggregation uplinks requiring extended fiber reach
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 complying with IEC 60825‑1
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Industry Standards: IEEE 802.3ba, QSFP28 MSA, SFF‑8665, SFF‑8636
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Environmental Regulation: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco QSFP-100G-ER4L-S QSFP28 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. Cannot be electrically split into independent 25G channels via breakout cables.
Model Comparison Reference
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QSFP-100G-ER4L-S: Duplex LC SMF LAN WDM, 30km/40km, commercial temperature, APD receiver
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QSFP-100G-LR4-S: Duplex LC SMF LAN WDM, maximum 10 km reach
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QSFP-100G-ZR4-S: Duplex LC SMF long extended reach, up to 80 km
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QSFP-100G-FR-S: Duplex LC single-lambda PAM4, maximum 2 km reach
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QSFP-100G-DR-S: Duplex LC single-lambda PAM4, maximum 500 m reach
UNSPSC Classification Code
43222618 – Cisco QSFP-100G-ER4L-S extended-reach LAN WDM single-mode QSFP28 transceiver with DOM, hot-swappable 100 Gigabit optical module for metro, inter-data-center and long-distance campus 100G 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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