The Siemens BS (Base Station) series is a range of modular GSM base stations designed for flexible deployment across indoor and outdoor environments. Models like the BS-20, BS-40, and BS-240 support various capacities—from compact microcells to high-capacity macro sites—across GSM frequency bands. Known for their scalability, high TRX density, and integrated cross-connect features, Siemens BS systems were widely used for reliable mobile coverage in both urban and rural networks.