ETSI GTS GSM 08.58
ETSI GTS GSM 08.58
Digital cellular telecommunications system (Phase 2+) (GSM); Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 3 specification (GSM 08.58 version 5.10.0 Release 1996)
standard published 11/01/1999 by European Telecommunications Standards Institute