QSFP-100G-SR4-S is a Cisco 100-Gigabit Ethernet QSFP28 transceiver designed for short-reach, high-bandwidth fiber links. It’s a 100GBase-SR4 optic that runs over multimode fiber using parallel optics, commonly deployed in data centers and high-density switching environments.
Why buyers pick QSFP-100G-SR4-S (plain English)
True 100G short-reach performance Delivers full 100GbE bandwidth for switch-to-switch and switch-to-server connectivity.
Data center standard SR4 is one of the most widely used 100G optics for short-distance links.
High-density cabling Uses parallel fiber to support high port density in modern leaf-spine architectures.
Cisco-qualified optics Designed and tested for compatibility with Cisco 100G switching platforms.
Cost-effective at short distances Lower cost than long-reach 100G optics when fiber runs are short.
60-second spec box (QSFP-100G-SR4-S)
Form factor QSFP28
Speed 100GbE (100GBase-SR4)
Fiber type Multimode fiber (OM3 / OM4)
Wavelength 850 nm (parallel optics)
Connector MPO-12
Max distance Up to ~70 m (OM3) Up to ~100 m (OM4)
Use case Data center short-reach 100G switch and server interconnects.
Where it fits (and when to choose something else)
Perfect for:
Data center leaf-spine architectures
High-density 100G switch ports
Short-distance fiber runs
Parallel-fiber environments
Choose something else if:
You’re using duplex fiber → BiDi or CWDM optics
You need longer distances → LR4 optics
You want fiber reuse → 40/100G BiDi modules
TL;DR
QSFP-100G-SR4-S is Cisco’s 100GBase-SR4 QSFP28 optic: a short-reach, parallel-fiber transceiver delivering full 100GbE performance in modern data center networks.
Key specifications
Feature
Specification
Transceiver Type
QSFP28
Data Rate
100 Gbps (4x25 Gbps)
Interface
100GBASE-SR4
Media Type
Multimode Fiber (MMF)
Connector
MTP/MPO-12
Wavelength
850 nm
Maximum Distance
100m over OM4 MMF, 70m over OM3 MMF
Operating Temperature
0°C to 70°C
Power Consumption
< 3.5W (typically 2.5W)
DOM/DDM Support
Yes
Features and use cases
High Performance:Provides an aggregate data rate of 100 Gbps by utilizing four lanes, each running at 25 Gbps.
Breakout Connectivity:Supports 100G to 4x25G breakout applications, allowing a single 100G port to be connected to four 25G endpoints.
Plug-and-Play:A hot-swappable I/O device that plugs into a Cisco QSFP port, simplifying installation and maintenance.
Real-time Monitoring:Digital Optical Monitoring (DOM) allows network administrators to check real-time operating parameters like temperature, voltage, and optical power.
Data Center Applications:Commonly used for short-range connections within data centers, including server-to-switch and switch-to-switch links.
For full compatibility, the host platform may need to support Forward Error Correction (FEC) for the 100m reach on OM4 fiber.
