The Juniper EX4400-48MP-S is the spare chassis version of the EX4400-48MP, designed for organizations that maintain replacement inventory or require customized hardware configurations. This model is supplied without power supplies and fan modules, enabling customers to install compatible AC or DC power supplies and airflow options that match their deployment requirements. The chassis features 12 × 100M/1/2.5/5/10GbE RJ-45 Multi-Gigabit PoE++ ports and 36 × 100M/1/2.5GbE RJ-45 PoE++ ports. It also supports optional expansion modules for 10GbE SFP+, 25GbE SFP28, or 100GbE QSFP28 uplinks, making it ideal for high-performance enterprise access networks supporting Wi-Fi 6E, Wi-Fi 7, IP surveillance, and IoT devices.