Refurb Squared
0.5m (2ft) Arista Networks Compatible 400G OSFP 8 x 50G PAM4 Flat Top to 400G QSFP-DD 8 x 50G PAM4 Passive Direct Attach Copper Twinax Cable
0.5m (2ft) Arista Networks Compatible 400G OSFP 8 x 50G PAM4 Flat Top to 400G QSFP-DD 8 x 50G PAM4 Passive Direct Attach Copper Twinax Cable
ISO 14001:2015
ISO 45001:2018
ISO 9001:2015
The 400G OSFP to 400G QSFP-DD DAC provides a 400G copper direct-attach solution with a Flat-top (OSFP-RHS) form factor, suitable for very short links and offers a cost-effective way to establish a 400-Gigabit link between 400G ports of switches/routers within racks and across adjacent racks. It is compliant with OSFP MSA, QSFP-DD MSA and IEEE 802.3bs standards. This DAC is designed with ultra-low loss materials, square rings, twisted pair cable 8 wires and shell extension construction for superior mechanical properties and bending performance. It supports 8x50G PAM4 modulation on both ends, and is primarily used to connect a 400G QSFP-DD switch to OSFP-based 400G network adapter cards. It is tested in actual switching systems to ensure optimal signal integrity and the best end-to-end performance, ideal for SDN, ML, and Cloud Computing. Note:When the 400G OSFP Flat Top to QSFP-DD DAC is used with NVIDIA ConnectX-7 OSFP NICs, ensure the NIC firmware version is between 28.42.1000 and 28.44.1206 to guarantee stable 400G 8x 50G PAM4 link performance.
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.





