The Ericsson Radio 2219 B3, also known as KRC161619/1 , is a radio unit designed for 1800MHz frequency band. It supports 2T1R Two Transmit One Receive configuration, Ericsson 2219 B3 allowing for simultaneous transmission on two antennas and reception on one antenna. This radio unit is commonly used in mobile network infrastructure to provide coverage and capacity for 1800MHz frequency band.