Cisco QSFP-100G-FR-S Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 100GBASE-FR1 QSFP28 Single Lambda Single-Mode Optical Transceiver Module with Digital Diagnostic Monitoring Support
SKU:QSFP-100G-FR-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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FR: 100GBASE-FR1 single-lambda optical standard defined under IEEE 802.3cd
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S: Commercial temperature grade variant (0°C ~ +70°C operating range)
Core Architecture:
Converts four 25G NRZ electrical lanes into one 100G 53.125 GBaud PAM4 optical stream over a single duplex LC single-mode fiber pair. Integrated onboard DSP with built-in Forward Error Correction (FEC).
Key Feature: Fiber-level interoperability with 400GBASE-DR4 transceivers (Cisco QDD-400G-DR4-S) using MPO-to-4×LC breakout cables to implement 4×100G uplink topologies.
Restriction:No electrical 4×25G breakoutsupported on the host switch port; operates only as native 100G.
Core Product Positioning
The Cisco QSFP-100G-FR-S is a commercial-grade hot‑swappable QSFP28 optical transceiver designed for medium-reach 100 Gigabit Ethernet connectivity inside data centers. It extends transmission distance beyond 100G-DR-S, supporting links up to 2 km over standard OS2 single-mode fiber while retaining duplex LC fiber infrastructure. It serves as a primary interconnection solution linking 100G QSFP28 leaf switches to 400G QSFP-DD core switches and intra-data-center point-to-point single-mode fiber links. Integrated DOM/DDM delivers continuous real-time monitoring of optical operating parameters to simplify routine 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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Nominal Center Wavelength: 1310 nm
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Electrical Interface: 4 × 25.78125 Gbps NRZ CAUI-4
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Optical Modulation: Single-channel 53.125 GBaud PAM4
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Built-in FEC: Enabled by module DSP (required to achieve full rated distance)
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Operating Mode: Native 100G only; electrical breakout not supported
Maximum Transmission Distance
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Up to2 kmover standard G.652 single-mode fiber
Optical Power Budget
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Average Transmit Optical Power: -2.4 dBm ~ +4.0 dBm
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Minimum Receiver Sensitivity: -6.4 dBm
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Maximum Allowable Received Optical Power: +4.5 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-FR1 Ethernet; supports fiber interoperation with 400GBASE-DR4 modules via breakout cabling
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-distance leaf-spine fabric 100GE uplinks within large-scale cloud and enterprise data centers
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Interconnection between 100G QSFP28 leaf switches and 400G QSFP-DD core switches using MPO-to-LC breakout cables
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Intra-data-center point-to-point single-mode fiber connections ranging from 500m to 2km
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Data center migration projects leveraging existing duplex LC OS2 single-mode fiber infrastructure
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Medium-reach aggregation links between compute pods requiring extended single-mode transmission range
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 802.3cd, 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-FR-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 and MPO breakout cables sold separately. Cannot be electrically split into independent 25G channels.
Model Comparison Reference
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QSFP-100G-FR-S: Duplex LC SMF single-lambda PAM4, 2km, native 100G, built-in FEC
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QSFP-100G-DR-S: Duplex LC SMF single-lambda PAM4, 500m reach
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QSFP-100G-LR-S: Duplex LC SMF single-lambda PAM4, 10km reach
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QSFP-100G-LR4-S: Duplex LC SMF four-channel CWDM NRZ, 10km, no onboard FEC
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QSFP-100G-SR4-S: MPO‑12 multi-mode parallel optics, supports 4×25G breakout
UNSPSC Classification Code
43222618 – Cisco QSFP-100G-FR-S single-lambda medium-reach single-mode QSFP28 transceiver with DOM and integrated FEC, hot-swappable 100 Gigabit optical module for data center leaf-spine networking and 100G-to-400G migration.
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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