Cisco 4OC12X/POS-IR-SC

The Cisco 4OC12X/POS-IR-SC is a line card module designed for use in Cisco 12000 Series routers. It provides four ports of OC-12/STM-4 (Optical Carrier level 12/Synchronous Transport Module level 4) connectivity using Packet over SONET/SDH (Synchronous Optical Networking/Synchronous Digital Hierarchy) technology. The "IR" in the name stands for Intermediate Reach, indicating that it supports transmission distances of up to 40 kilometers. The "SC" refers to the type of optical connector used, which is the standard SC (Subscriber Connector) type. This line card is typically used in high-performance network environments where high-speed and long-distance connectivity is required.