![]() ![]() Used for monitoring/alamrs in case of environmental failure. A (likely) RS-485 based site-local bus between different parts, particularly any power supply / climate systems and the digital unit. LMT (Local Maintenance Terminal) A hosts a RS-232 port used for connecting to the DUG 20 from a PC running the OMT software. Note that its a bit smaller than the sfp slots So a cross-over cable is needed to connect to it. Same pinout as a Digium card with 2 lines per port. The DUG has four T1/E1/J1 lines exposed as two RJ45 connectors ("ET A" and "ET B") The back-haul interface is Classic T1/E1/J1 (ISDN) based. This is where you connect your RUS or RRUS, either via direct-attach cables (usual for RUS), or via SFP transceivers and optical fiber (usual for RRUS). The DUG 20 has 6 SFP slots for the interface towards the radio units, labelled RI A.F The card contains a FAT filesystem with both the software as well as the configuration (IDB = Installation DataBase). There is a CF slot on the left this device and it holds a 256mbyte CF card. The DUG 20 is only compatible with the RUS and RRUS radio units, not with the older RUG units. It combines the baseband processing and back-haul interface of up to 12 TRX, in 1.6 logical BTSs. This is the second-generation GSM Digital Unit for RBS 6xxx.
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