Cisco QSFP-100G-SR1.2 Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 100GBASE-SR1.2 QSFP28 Bidirectional Short-Reach Multi-Mode Optical Transceiver Module with Digital Diagnostic Monitoring Support
SKU:QSFP-100G-SR1.2
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 electrical lanes for CAUI-4)
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SR1.2: Short Reach BiDi optical standard utilizing two 50G PAM4 bidirectional optical channels
Core Architecture: Converts four 25G NRZ electrical lanes into two 50G PAM4 bidirectional optical streams overone duplex LC two-strand multi-mode fiber pair.
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Cannot perform electrical 4×25G breakouton switch ports; native 100G operation only.
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Interoperable with Cisco QDD-400G-SR4.2 for 4 × 100G fiber breakout toward 400G platforms.
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Not interoperable with QSFP-100G-SRBDdue to different FEC implementations.
Core Product Positioning
The Cisco QSFP-100G-SR1.2 is a commercial-grade hot‑swappable QSFP28 bidirectional optical transceiver optimized for data center migration projects. It enables operators to upgrade legacy 10G / 40G duplex LC multi-mode fiber infrastructure to 100G without replacing existing cabling or deploying expensive MPO parallel ribbon fiber. Suitable for leaf-spine fabric uplinks, ToR aggregation, and intra-data-center interconnections, and provides a clear migration path to 400G Ethernet. Integrated DOM/DDM supports continuous real-time monitoring of optical operating parameters for simplified troubleshooting and lifecycle management.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Nexus 3000 / 9000 Series Switches; Catalyst 9500 / 9600 Series Switches; ASR 1000 Series Routers 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
Laser‑optimized 50/125μm multi-mode fiber (MMF) only. Incompatible with single-mode fiber.
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OM3 MMF: Maximum reach of 70 meters
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OM4 MMF: Maximum reach of 100 meters
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OM5 MMF: Maximum reach of 150 meters
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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BiDi Wavelength Pair: 850 nm / 910 nm VCSEL
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Electrical Interface: 4 × 25.78125 Gbps NRZ CAUI-4
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Optical Modulation: Two × 50 Gbps PAM4 bidirectional channels
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Operating Mode: Native 100G only; no port-side 4×25G breakout
Maximum Transmission Distance
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OM3 Multi-Mode Fiber: Up to 70 m
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OM4 Multi-Mode Fiber: Up to 100 m
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OM5 Multi-Mode Fiber: Up to 150 m
Optical Power Budget (per optical channel)
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Average Transmit Optical Power: -6.2 dBm ~ +4.0 dBm
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Minimum Receiver Sensitivity: -9.0 dBm
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Maximum Allowable Received Optical Power: +4.0 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 100GBASE-SR1.2 Ethernet; supports fiber-level interoperation with QDD-400G-SR4.2 for 4 × 100G topology
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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10G/40G to 100G data center migration reusing existing duplex LC multi-mode fiber without recabling
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Short-distance 100GE inter-switch uplinks inside leaf-spine data center fabrics
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Top-of-Rack switch aggregation uplink upgrades in high-density server environments
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Migration links connecting 100G QSFP28 switches to 400G QDD-based core switches
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Cost-sensitive enterprise and cloud data center deployments avoiding MPO ribbon fiber infrastructure
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 802.3bm, 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-SR1.2 QSFP28 Optical Transceiver
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Hardware Installation Guide
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Safety and Regulatory Documentation
Duplex LC multi-mode fiber patch cables sold separately. Not interoperable with QSFP-100G-SR4 or QSFP-100G-SRBD.
Model Comparison Reference
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QSFP-100G-SR1.2: Duplex LC BiDi MMF, 70m/100m/150m, native 100G only, PAM4 BiDi
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QSFP-100G-SR4-S: MPO‑12 parallel MMF, supports native 100G and 4×25G breakout
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QSFP-100G-SRBD: Duplex LC BiDi MMF, dual-rate 40G/100G, incompatible with SR1.2
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QSFP-100G-DR-S: Duplex LC single-mode, 500m reach
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QSFP-100G-LR4-S: Duplex LC single-mode CWDM, 10km reach
UNSPSC Classification Code
43222618 – Cisco QSFP-100G-SR1.2 bidirectional short-reach multi-mode QSFP28 transceiver with DOM, hot-swappable 100 Gigabit optical module for economical data center fiber reuse and 100G network 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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