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Dieter Spaar spaar at mirider.augusta.deHello Alexander, On Sat, 11 Mar 2017 00:42:32 +0100, "Alexander Huemer" <alexander.huemer at xx.vu> wrote: > > I was not able to measure any voltage on any of the DSUB-9 pins when the=20 > BTS is powered up, but believe that on either RX or TX there should be=20 > the voltage level of the serial line since RS232 is active low. > Has somebody seen this behavior? Maybe there is something wrong with the cable? This is from my notes about the BS-11 serial interface: The four E1 BNC connectors are here. 5 6 7 8 x x x x x x x x 1 2 3 4 2: LMT Tx (out) 6: LMT Rx (in) 4: +5V 8: GND There are two more 8-pin connectors below, you have to connect the cable to the top one (below the E1 BNC connectors). The same with some pictures is also here: https://osmocom.org/projects/openbsc/wiki/BS11LMT Best regards, Dieter -- Dieter Spaar, Germany spaar at mirider.augusta.de