Know your gear
Modular Interface Cards (MICs) install into two slots in the front of the ACX4000 router and provide the physical connections to various network media types. The slots are labeled1/0 and1/1. MICs receive in coming packets from the network and transmit outgoing packets to the network. During this process, each MIC performs framing and high-speed signaling for its media type. Before transmitting outgoing data packets through the MIC interfaces, the packet forwarding engine encapsulates the packets received.