FOSS in the Mobile World
The Siemens BS-11 microBTS


Siemens BS-11 microBTS
plain old 2G (GSM voice calls, CSD)
one or two TRX, 30mW to 2W each, GSM900
two E1 interfaces (for daisy-chaining)
documentation under NDA, but
99.9% of the A-bis protocol available from GSM specs
See TS 04.08 (RLL), 12.21 (OML), 08.58 (RSL)
RS232 serial port for Local Maintenance Terminal
LMT software proprietary under NDA
not needed for operation of the BTS