The C-NIM-4X is a Next-Generation 1G/10G LAN/WAN module with local Layer 2 switching capabilities on all four ports. This provides a price-effective, low-density 4-port Layer 2 LAN switch with capacity for switching four Small form-Factor Pluggable (SFP)/SFP+ ports at speeds up to 10 Gbps. The two highest-numbered ports can be configured for native Layer 3 operation. Configuring ports for Layer 3 will provide full feature parity with the router’s embedded WAN ports. This module provides high-speed WAN connectivity through four ports supporting serial gigabit media-independent interface (SGMII)/1000BASE-X-based SFP and 10GBASE-R-based SFP+ pluggables. A 100-Mbps optic pluggable connection can also be supported by using the GLC-GE-100FX SFP transceiver. The four 1G/10G WAN ports are connected to the backplane using a single 10-Gbps-capable internal link. When used at maximum capacity, they thus form what is known as an oversubscribed connection of 4 to 1. IEEE 802.1AE MACsec is supported as described in the Product Overview.

Ports & interfaces
Fiber ports quantity	4
Weight & dimensions
Width	89 mm
Depth	184 mm
Height	32 mm
Weight	195 g
Operational conditions
Operating temperature (T-T)	-5 - 55 °C
Storage temperature (T-T)	-40 - 70 °C
Operating relative humidity (H-H)	5 - 85%
Storage relative humidity (H-H)	5 - 95%
Network
Ethernet interface type	10 Gigabit Ethernet, Gigabit Ethernet
Optical fiber
Fiber optic connector	SFP, SFP+
Performance
Compatibility	Catalyst 8300 Series