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laforge, 08/09/2020 01:36 PM
re-ordering; more details
DUG 20¶
This is the second-generation GSM Digital Unit for RBS 6xxx. It combines the baseband processing and back-haul interface of up to 12 TRX, in 1..6 logical BTSs.
The DUG 20 is only compatible with the RUS and RRUS radio units, not with the older RUG units.
- Table of contents
- DUG 20
Technical data¶
- 48V DC supply power
- 70W maximal power consumption
- Size: 8U x 31mm x 250mm
- Weight: < 2kg
Flash¶
There is a CF slot on the left this device and it holds a 256mbyte CF card. The card contains a FAT filesystem with both the software as well as the configuration (IDB = Installatin DataBase).
Connections¶
Front Haul¶
The DUG 20 has 6 SFP slots for the interface towards the radio units, labelled RI A..F
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).
Back-Haul interface¶
The back-haul interface is Classic T1/E1/J1 (ISDN) based. The DUG has four T1/E1/J1 lines exposed as two RJ45 connectors ("ET A" and "ET B")
Pinout: FIXME
ESB port¶
note that its a bit smaller than the sfp slots
LMT B, LMT A, EC, GPS¶
LMT A¶
LMT (Local Maintenance Terminal) A hosts a RS-232 port used for connecting to the DUG 20 from a PC running the OMT software.
LMT B¶
FIXME
EC¶
FIXME.
GPS¶
This port is meant for attaching an external GPS receiver. The connector includes- RS485/422 receiver for NMEA from the GPS
- RS485/422 transmitter for command to the GPS
- RS485/422 receiver for 1PPS signal from the GPS
- 12V power supply for the GPS
48V DC in¶
Connectory type is a https://www.te.com/usa-en/product-1982299-3.html with associated crimp contacts.
Connector on the Back¶
This connector is not used during normal operation. We assume it is for factory / service use only.
LEDs¶
Overview Pictures¶
Updated by laforge almost 4 years ago · 7 revisions