Cisco NM-16ESW Ethernet Switch Network Module

The Cisco NM-16ESW Ethernet Switch Network Module expands Cisco ISR routers with 16 Fast Ethernet (10/100 Mbps) RJ-45 ports for integrated Layer 2 switching. Designed for branch offices and distributed enterprise networks, it provides additional LAN connectivity for devices such as workstations, printers, and IP phones without needing a separate switch, and installs in a router’s network module slot. Key specifications include Manufacturer Part Number NM-16ESW, compatibility with Cisco Integrated Services Routers (ISR Series), copper 10/100Base-T interfaces, and IEEE 802.3 and IEEE 802.3u standards supporting Layer 2 switching. Common replacements include Cisco NIM-ES2-8, NIM-ES2-4, and HWIC-4ESW, underscoring its role in expanding LAN port capacity within branch-office deployments.