DUS 31 » History » Revision 2
Revision 1 (laforge, 11/03/2020 03:24 PM) → Revision 2/5 (laforge, 11/03/2020 03:28 PM)
h1. DUS 31
The DUS 31 is the first digital unit (we know) which supported multi-standard on the same DU. As you can run both LTE and GSM on the same unit, it basically combines a DUL and a DUG.
The GSM back-haul is no longer exposed via E1/T1 TDM lines, but uses _Ericsson PacketAbis over IP_, which is basically the L2TP/HDLC based protocol stacking that the [[SIU 02]] or the [[TCU]] would have traditionally generated.
h2. Mass Storage
The unit has an internal 8GB USB Mass Storage device, as a _Micron Embedded USB Mass Storage Drive (e230)_. You can think of it as a USB thumbdrive, but not with an exterenal USB A plug, but with a 9-pin 2-row 2.54mm pitch receptacle, which can be plugged directly onto USB 2.0 headers on mainboards.
The partition table looks as follows:
<pre>
Disk ./dus31.dd: 7.56 GiB, 8120172544 bytes, 15859712 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000
Device Boot Start End Sectors Size Id Type
./dus31.dd1 4 1999999 1999996 976.6M 21 unknown
./dus31.dd2 2000000 13999999 12000000 5.7G 21 unknown
</pre>
