Overview ALEX (short for Alexander , later rebranded as Ericsson Library EXchange ) is Ericsson’s proprietary electronic documentation system for its telecommunications infrastructure. For decades, it has been the primary knowledge base for engineers, field technicians, and RAN (Radio Access Network) specialists working on Ericsson’s GSM, WCDMA, LTE, and early 5G nodes (e.g., RBS 6000 series, eNodeBs, and MMEs).