BS11Troubleshooting » History » Version 14
dexter, 02/19/2016 10:47 PM
1 | 1 | = Troubleshooting = |
|
---|---|---|---|
2 | |||
3 | == Known problems with the LMT connection == |
||
4 | |||
5 | 12 | dexter | |
6 | 1 | Problem: |
|
7 | 4 | 'bs11_config' can't get a connection to the BS-11 (no 'LMT LOGON: ACK') |
|
8 | 1 | ||
9 | Solution: |
||
10 | 2 | The BS-11 is a little bit choosy about the RS232 levels, I discovered some problems |
|
11 | 4 | with my Dell PC (could receive anything, but no tx). Just switch to an el-cheapo USB |
|
12 | to Serial adapter, this should solve the problem. |
||
13 | 5 | dexter | |
14 | Some background notes: |
||
15 | 6 | dexter | We measured the RS232 levels and we found out that the level of our RS232<==>USB Adaptor |
16 | is much lower (about +/-6 Volts) than normaly expected (+/-12V). The BS11 transmits at a |
||
17 | 13 | dexter | semeliar level (about +/-8 Volts). This may be an explaination why the BS11 does not like |
18 | 12 | dexter | the normal (+/-12V) levels. |
19 | 6 | dexter | |
20 | 12 | dexter | [[Image(Lmt_bts-rx.jpg, 15%)]] [[Image(Lmt_bts-tx.jpg, 15%)]] [[Image(Lmt_btx_tx_does_not_work.jpg, 15%)]] |
21 | 10 | dexter | |
22 | 12 | dexter | From left to right: BTS-RX (PC-TX), BTS-TX (PC-RX), BTS-RX (PC-TX) with a real RS232 port. |
23 | 14 | dexter | |
24 | |||
25 | == The "everything looks good - nothing works" - problem == |
||
26 | |||
27 | When you use openBSC with early mISDN drivers (<= 2.6.31, patched) your setup might refuse |
||
28 | to work while everything looks normal. No error messages, normal PLL Work Value Abis Link |
||
29 | works perfect but no phone can see your network. |
||
30 | |||
31 | Than the first thing you should do is to upgrade your kernel to get the latest mISDN drivers. |
||
32 | |||
33 | Note: When your BS11 is out of Sync the setup also refuses to work. In this case you |
||
34 | sould sync your BS11 as described in the isdnsync-howto. |
||
35 | |||
36 | See also: |
||
37 | http://lists.gnumonks.org/pipermail/openbsc/2009-August/000783.html |
||
38 | |||
39 | |||
40 | |||
41 | |||
42 | |||
43 | |||
44 | |||
45 | |||
46 | |||
47 |