Cisco QSFP-100G-SM-SR Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 100GBASE-CWDM4 Lite QSFP28 Single-Mode Optical Transceiver Module with Digital Diagnostic Monitoring Support
SKU:QSFP-100G-SM-SR
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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SM-SR: Single-Mode Short Reach, also known as CWDM4 Lite four-wave CWDM optical standard
Important Note: Interoperable with Cisco QSFP-100G-CWDM4-S over duplex LC single-mode fiber.
Critical Restriction:4×25G electrical breakout is NOT supported, operates only under native 100G mode.
Core Architecture:
Four independent 25G NRZ CWDM optical channels operating on wavelengths: 1270 nm, 1290 nm, 1310 nm, 1330 nm. All four optical signals are multiplexed/demultiplexed internally within the module and transmitted over a single duplex LC single-mode fiber pair. It adopts cooled DML transmitters and PIN receivers.
Core Product Positioning
The Cisco QSFP-100G-SM-SR is a hot‑swappable QSFP28 optical transceiver optimized for medium-reach 100 Gigabit Ethernet inside enterprise and cloud data centers. It delivers a cost-effective CWDM4 Lite alternative to standard CWDM4 transceivers for intra-data-center leaf-spine connections and aggregation links up to 2 km. It enables network operators to leverage existing duplex LC OS2 single-mode fiber infrastructure for 100G upgrades. Integrated DOM/DDM provides continuous real-time monitoring of optical parameters to streamline routine maintenance and accelerate 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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CWDM Wavelength Grid: 1270 nm, 1290 nm, 1310 nm, 1330 nm
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Electrical Lane Rate: 4 × 25.78125 Gbps NRZ CAUI-4
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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
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Link Budget: 4.2 dB
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Average Transmit Optical Power: -4.0 dBm ~ +2.5 dBm
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Minimum Receiver Sensitivity: -11.5 dBm
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Maximum Allowable Received Optical Power: +3.5 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
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Operating Temperature:+10°C ~ +60°C
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Storage Temperature: -40°C ~ +85°C
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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; interoperable with QSFP-100G-CWDM4-S; 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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Enterprise campus medium-distance 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: 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-SM-SR 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-SM-SR: Duplex LC SMF CWDM4 Lite, 2km, 10~60°C, native 100G only
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QSFP-100G-CWDM4-S: Standard CWDM4 transceiver, 2km, wider operating temperature range
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QSFP-100G-DR-S: Duplex LC SMF single-lambda PAM4, 500m
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QSFP-100G-FR-S: Duplex LC SMF single-lambda PAM4, 2km
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QSFP-100G-LR4-S: Duplex LC SMF LAN WDM, 10km reach
UNSPSC Classification Code
43222618 – Cisco QSFP-100G-SM-SR CWDM4 Lite medium-reach 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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