Cisco 3201 Serial Mobile Access Router Interface Cards (SMICs) provide four asynchronous and synchronous serial interfaces on the router that connect to wired and wireless LAN and WAN communication. The SMIC is an asynchronous/synchronous serial mobile interface card. The SMIC supports four sets (only two sets on the Cisco 3220 model) of Cisco 12-in-1 serial signals. The SMIC communicates with the MARC through the PCI bus. The SMIC is based on PC/104-Plus Version 1.2 electrical and mechanical specification standards.