Juniper QFX5100 4x40G EM Expansion Module | Data Center, Enterprise

Add high-speed uplink capacity to a QFX5100 deployment without changing the fabric design. The QFX-EM-4Q provides four 40 GbE expansion ports, giving network teams a clean path to increase aggregation bandwidth in data center environments where oversubscription and port density must be controlled. This module fits naturally into Juniper QFX5100 architectures built for leaf-spine switching, virtualization, and storage-heavy traffic patterns. By extending the platform with 40 GbE connectivity, it supports higher-throughput uplinks for server access layers, top-of-rack designs, and inter-switch links that need more headroom than 10 GbE can provide. For infrastructure teams standardizing on QFX5100, the value is in preserving platform consistency while adding capacity where it is needed most. That reduces design drift, simplifies procurement, and keeps the switching layer aligned with existing operational practices. When the network needs more bandwidth, this expansion module delivers it in a form that matches the original system architecture.