Hello Alexander,
On Sat, 11 Mar 2017 00:42:32 +0100, "Alexander Huemer" <[email protected]>
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 [email protected]
