DUG 20 » History » Revision 7
Revision 6 (laforge, 05/14/2020 09:33 AM) → Revision 7/16 (laforge, 08/09/2020 01:36 PM)
h1. 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.
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h2. Technical data
* 48V DC supply power
* 70W maximal power consumption
* Size: 8U x 31mm x 250mm
* Weight: < 2kg
h2. 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).
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h2. Connections
h3. Front Haul
The DUG 20 10 has 6 SFP slots for the interface towards the radio units, labelled RI A..F
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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).
h3. h2. 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")
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Pinout: FIXME h2. other details
h3. Flash
There is a CF slot on the left this device and it holds a 256mbyte CF card.
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h3. LEDs
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h3. ESB port
note that its a bit smaller than the sfp slots
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h3. LMT B, LMT A, EC, GPS
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h3. 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.
h3. LMT B
FIXME
h3. EC
FIXME.
h3. 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
h3. 48V DC in
Connectory type is a https://www.te.com/usa-en/product-1982299-3.html with associated crimp contacts.
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h3. Connector on the Back
This connector is not used during normal operation. We assume it is for factory / service use only.
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h2. LEDs
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h2. Overview Pictures
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