Hello all!
I'm still trying to bring onAir any of BTS in lab.
Today we were trying with Ericsson RBS-2206. We limited hardware to the
minimal possible setup containing:
DXU-21
dTRU-1800
CDU-G 1800
And we created IDB with 1 cell 1TX 2RX
After it we tried to use default config from master branch initially
created for RBS-2308.
It worked pretty fine except RF Power which was configured as 41dBm and 41
- 12 = 29 dBm. Value 29 was not acceptable for our RBS.
I checked with Ericsson BSC Doc and found that our RBS2206 has max RF
output 47dBm for DCS1800. (btw, RBS2308 has only 34dBm max output according
to the same document, maybe config needs to be corrected)
After setting 47dBm to config, TX-0 was configured correctly and
Operational led was on.
The main problem we are faced now is unavailability to perform
"Enable"action on TX and RX objects and all next steps are not successful
too.
After getting logs from RBS (all files are attached) I see that TX and RX
enabling fails with line:
[20-11-03 11:51:27.264] 0\RC_HWU_TX hwu_tx_state.c:223 TRACED:TX Enable
FAILED!, RCFW_ATC_State NOT Synchronized
Looks like internal oscillator is not ready. So, the question is how to
make internal oscillator synchronized? Could it be an E1 Sync stability
issue caused by Digium cards? I remember we discussed it on earlier steps
of bringing up OSMO-BSC.
Now I have just 2 ideas what to do:
1. Set Digium card to get Sync from RBS. Now Digium is configured for
Internal clocking and acts as master. Maybe in case when both sides will be
configured to get sync from E1 it will decrease difference between internal
clock of RBS and E1 and RBS will get Synced state.
2. Theoretically I can try to use Nokia DX200 BSC as a clock master for
Digium and deliver sync to RBS from Digium. I'm not sure if timing accuracy
is the same for Nokia and Ericsson HW.
One more question is where can I find some info about timing accuracy for
BTS and any possible way to check it on the existing E1 line?
Thank you
Babanov Ivan