11 Mar
2017
11 Mar
'17
9:37 a.m.
Hello Alexander,
On Sat, 11 Mar 2017 00:42:32 +0100, "Alexander Huemer"
<alexander.huemer(a)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(a)mirider.augusta.de