10BASE-SR is an Ethernet standard for short-range data transmission over multimode fiber optic cables, operating at a speed of 10 megabits per second (Mbps). It is designed for distances up to 300 meters and uses an 850 nm wavelength for light transmission. The "10" refers to the speed, "BASE" indicates baseband signaling, and "SR" stands for short range. This standard is part of the IEEE 802.3 Ethernet family and is commonly used in local area networks (LANs) for high-speed data communication.