Refurb Squared
Cisco QSFP-100G-ER4L-S Compatible 100GBASE-ER4L QSFP28 4 x 25G NRZ 1310nm 40km DOM Duplex LC/UPC SMF Optical Transceiver Module
Cisco QSFP-100G-ER4L-S Compatible 100GBASE-ER4L QSFP28 4 x 25G NRZ 1310nm 40km DOM Duplex LC/UPC SMF Optical Transceiver Module
ISO 14001:2015
ISO 45001:2018
ISO 9001:2015
The Cisco QSFP-100G-ER4L-S compatible QSFP28 transceiver supports 100GBASE Ethernet links up to 40km over single-mode fiber using duplex LC connectors. It operates on four LWDM wavelengths with integrated multiplexing and demultiplexing. With a BOX+FPC+PCBA separated design, the module delivers enhanced reliability, sealing, and thermal performance. It complies with IEEE 802.3ba standards and provides digital diagnostics via the I2C interface for real-time monitoring.
Enterprise Grade Performance
Enterprise Grade Performance
Our networking cables and optical transceivers are designed for high-performance enterprise networks. They support fast data transmission, stable connectivity, and consistent signal strength across switches, servers, and routers.
Wide Device Compatibility
Wide Device Compatibility
These modules are engineered to work with many leading networking brands such as Cisco, Juniper, Arista, and other enterprise systems. They integrate easily into existing network infrastructure.
Simple Plug And Play Setup
Simple Plug And Play Setup
Installation is quick and easy. Simply insert the cable or transceiver into the compatible port and it begins operating immediately without complicated configuration.
Reliable Connection Stability
Tested And Verified Products
Affordable Enterprise Pricing

Competitive Pricing
Refurb Squared networking hardware delivers high-speed connectivity using tested optical modules and enterprise-grade cables built for reliability and seamless device compatibility.
Built For Reliable Networking
At Refurb Squared we provide high-quality networking hardware trusted by engineers and IT professionals. Our mission is to deliver reliable technology at affordable prices.





