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tnt, 10/09/2020 09:37 AM
Add E1 pinout
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:
RJ45 | Line | Signal |
---|---|---|
1 | A | RX tip (+) |
2 | A | RX ring (-) |
3 | B | TX tip (+) |
4 | A | TX tip (+) |
5 | A | TX ring (-) |
6 | B | TX ring (-) |
7 | B | RX tip (+) |
8 | B | RX ring (-) |
Same pinout as a Digium card with 2 lines per port.
So a cross-over cable is needed to connect to it.
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.
RJ45 | DB-9 (female) | Signal |
---|---|---|
1 | 5 | GND |
2 | 3 | TxD |
3 | 2 | RxD |
LMT B¶
Site-LAN and LMT B
FIXME
EC¶
"Enclosure Control". A (likely) RS-485 based site-local bus between different parts, particularly any power supply / climate systems and the digital unit. Used for monitoring/alamrs in case of environmental failure.
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 tnt over 3 years ago · 11 revisions