Juniper QSFP-DAC-40G-50CM 40G QSFP+ DAC | Twinax, Short Reach

Maintain fast, predictable connectivity between equipment in the same rack with this 40G QSFP+ direct attach cable. The 50 cm twinax assembly is designed for short-reach links where simplicity matters: fewer components, lower power consumption, and no transceiver pairing to manage. That makes it a practical choice for top-of-rack switching, adjacent server connections, and other high-density deployments where every inch of cable management counts. Compared with optical alternatives, a DAC link keeps the signal path direct and the deployment model straightforward. It is well suited for environments that need 40 GbE throughput without the added cost and operational overhead of separate optics and fiber patching. For infrastructure teams standardizing short interconnects, this cable helps preserve rack density while supporting the performance expectations of modern aggregation and leaf-spine designs. Use it where the distance is known, the layout is fixed, and low-latency transport is the priority. The result is a cleaner rack, simpler procurement, and a connection method that aligns with the economics of short-range 40G networking.