Cisco QSFP-100G-CWDM4-S Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 100GBASE-CWDM4 QSFP28 Four-Wavelength CWDM Single-Mode Optical Transceiver Module with Digital Diagnostic Monitoring Support
SKU:QSFP-100G-CWDM4-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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CWDM4: Four-channel Coarse Wavelength Division Multiplexing optical standard defined under CWDM4 MSA
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S: Commercial temperature grade variant (0°C ~ +70°C operating range)
Core Architecture:
Four independent 25G NRZ DML transmitters operating on CWDM wavelengths: 1271 nm, 1291 nm, 1311 nm, 1331 nm. Internal multiplexer/demultiplexer combines all four optical signals for transmission over a single duplex LC single-mode fiber pair. Supports IEEE Clause 91 RS-FEC on host platforms.
Interoperability Note: Compatible with Cisco QSFP-100G-SM-SR (CWDM4 Lite) over duplex LC OS2 fiber.
Critical Restriction:4×25G electrical breakout is NOT supported; operates only as native aggregated 100G link.
Core Product Positioning
The Cisco QSFP-100G-CWDM4-S is a commercial-grade hot‑swappable QSFP28 optical transceiver designed for medium-reach 100 Gigabit Ethernet inside cloud and enterprise data centers. It delivers cost-effective 100G connectivity up to 2 km over standard duplex LC single-mode fiber, ideal for leaf-spine fabric uplinks, aggregation pod interconnections and data center migration projects reusing existing OS2 fiber infrastructure. Integrated DOM/DDM enables continuous real-time monitoring of optical operating parameters to streamline maintenance and accelerate fault diagnostics.
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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CWDM Wavelength Grid: 1271 nm, 1291 nm, 1311 nm, 1331 nm
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Electrical Lane Rate: 4 × 25.78125 Gbps NRZ CAUI-4
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Supported FEC: IEEE Clause 91 RS-FEC
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Operating Mode: Native 100G only; electrical breakout function disabled
Maximum Transmission Distance
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Up to2 kmover standard G.652 single-mode fiber
Optical Link Budget Parameters
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Average Transmit Optical Power: -6.5 dBm ~ +2.5 dBm
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Minimum Receiver Sensitivity (OMA): -9.8 dBm
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Maximum Allowable Received Optical Power: +2.5 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-CWDM4 Ethernet; interoperable with QSFP-100G-SM-SR; supports host-side RS-FEC. No electrical 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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Medium-reach 100GE leaf-spine fabric uplinks within cloud and enterprise data center pods
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Intra-data-center point-to-point single-mode fiber connections ranging from 500 meters to 2 km
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Data center migration projects reusing existing duplex LC OS2 single-mode fiber infrastructure
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Aggregation layer interconnections between compute racks and core switching tiers
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Medium-distance enterprise campus 100G backbone links
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: CWDM4 MSA, IEEE 802.3bm, 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-CWDM4-S QSFP28 Optical Transceiver
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Hardware Installation Guide
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Safety and Regulatory Documentation
Duplex LC single-mode patch cords sold separately. Cannot be electrically split into independent 25G channels.
Model Comparison Reference
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QSFP-100G-CWDM4-S: Duplex LC SMF CWDM4 standard, 2km, 0~70°C, interoperable with SM-SR
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QSFP-100G-SM-SR: CWDM4 Lite variant, narrower operating temperature range (10~60°C)
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QSFP-100G-DR-S: Duplex LC single-lambda PAM4, maximum 500 m reach
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QSFP-100G-FR-S: Duplex LC single-lambda PAM4, maximum 2 km reach
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QSFP-100G-LR4-S: Duplex LC LAN WDM four-wave NRZ, maximum 10 km reach
UNSPSC Classification Code
43222618 – Cisco QSFP-100G-CWDM4-S medium-reach CWDM4 single-mode QSFP28 transceiver with DOM, hot-swappable 100 Gigabit optical module for intra-data-center leaf-spine and aggregation 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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