Cisco 4OC12/POS-IR-SC-B

The Cisco 4OC12/POS-IR-SC-B is a line card module for Cisco routers. It is designed to provide high-speed optical connectivity using the Packet over SONET/SDH (POS) protocol. The "4OC12" in the name indicates that it supports up to four OC-12 (Optical Carrier 12) interfaces, which have a data rate of 622.08 Mbps. The "POS-IR-SC-B" refers to the specific type of POS interface, which is Inverse Multiplexing for ATM (IMA) capable, and uses a SC (Subscriber Connector) optical connector. This line card is typically used in service provider networks to connect to optical networks and provide high-speed data transmission.