NM-CEM-4SER

The Cisco NM-CEM-4SER is a carrier-grade network module designed for router-based circuit emulation over packet networks. This 4-port serial expansion module enables seamless TDM to IP migration while preserving legacy interfaces for enterprise and service provider deployments. As a plug-in module, it integrates directly into compatible Cisco routers to deliver reliable serial connectivity, simplified consolidation of WAN services, and cost-effective modernization of existing infrastructure across global networks.

Product Features Comparison

Model	NM-CEM-4SER, Cisco Network Module, 4-Port Serial, Circuit Emulation, For Router	EHWIC-VA-DSL-B, Cisco EHWIC WAN Card, for 3900 Router/High-Speed DSL/Enhanced Security	HWIC-2FE, Cisco HWIC, 2 Fast Ethernet ports	NM-32A, Cisco NM-32A, 32-port Async Module/Router/32 Async Ports
Brand	Cisco	Cisco	Cisco	Cisco
Module Type	n/a	n/a	Expansion module	Router Network Module
Port Configuration	4-Port Serial	DSL	2 x RJ-45 10/100Base-TX	32
Supported Speed	n/a	Up to 24 Mbps downstream	10 Mbps / 100 Mbps	Up to 115.2 kbps per port
Compatible Platform	Router	Cisco 3900 Series Router	n/a	Cisco Routers
Installation Type	Plug-in module	WAN Interface Card (WIC)	Plug-in module	Plug-in Module