[Openbts-discuss] USRP issue

[Tomas K. <de...@vo...>]

- All

I have some (for me weird) issue with USRP and I will be glad if
somebody will suggest me anything.
I was changing antenna (50ohm aerial matching) during execution
usrp_fft.py and since that time I'm unable to tune RX channel with any
of two RFX900 (I have USRP + 2xRFX900).

I have installed new machine with Fedora 11, gnuradio-3.2.2, OpenBTS
2.5.3 to exclude corrupted build failure. So I have the same results
with the original SW setup.
2) It's not a clock problem, reasons are described later.

I have signed one daughterboard as DB1, second as DB2 and made some test:

*Test case 1 - only DB1 is connected in USRP side A*

Attempt to run OpenBTS:

Starting the system...
1266436555.5621 INFO 3086686016 TRXManager.cpp:254:sendCommandPacket:
command CMD POWEROFF
1266436555.6352 FORCE 3087378128 Logger.cpp:90:gSetLogFile: setting log
path to /dev/null
1266436556.5832 WARNING 3086686016 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266436557.6049 WARNING 3086686016 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266436558.6276 WARNING 3086686016 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266436559.6494 WARNING 3086686016 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
dac_rate(): 104000000
dac_rate(): 104000000
1266436560.6708 WARNING 3086686016 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266436560.6752 INFO 3086686016 TRXManager.cpp:254:sendCommandPacket:
command CMD SETTSC 0
1266436560.6798 INFO 3086686016 TRXManager.cpp:254:sendCommandPacket:
command CMD RXTUNE 890200
1266436560.6922 INFO 3086686016 TRXManager.cpp:254:sendCommandPacket:
command CMD TXTUNE 935200
dac_rate(): 104000000
1266436560.7206 INFO 3086686016 TRXManager.cpp:254:sendCommandPacket:
command CMD SETSLOT 0 5
1266436560.7247 INFO 3086686016 TRXManager.cpp:254:sendCommandPacket:
command CMD POWERON
1266436560.7852 INFO 3086686016 TRXManager.cpp:254:sendCommandPacket:
command CMD SETPOWER 0
1266436560.7899 INFO 3086686016 GSMLogicalChannel.cpp:42:open:

I can scan OpenBTS with MS, but cant camp (there is no uplink - RX
channel), it is also a proof that clock unit works well. Without
connected clock there is a failure TXTUNE failed with status 1
If I disconnect USRP power (USB cable) , I get following messages, which
is correct.
fusb::_reap: No such device
fusb::_reap: No such device
fusb::_reap: No such device

Attemtps to run Kalibrator:

[root@openBTS kal-0.2]# ./kal -f 946600000
USRP side: B
FPGA clock: 52000000
Decimation: 192
Antenna: RX2
Sample rate: 270833.343750
error: fcch not detected in 20 frames

[root@openBTS kal-0.2]# ./kal -f 946600000 -A RX
USRP side: B
FPGA clock: 52000000
Decimation: 192
Antenna: TX/RX
Sample rate: 270833.343750
error: fcch not detected in 20 frames

ARFCN on side B cannot be scanned because there is no DB connected but
works.

[root@openBTS kal-0.2]# ./kal -f 946600000 -R A
USRP side: A
FPGA clock: 52000000
Decimation: 192
Antenna: RX2
error: usrp_source::tune

[root@openBTS kal-0.2]# ./kal -f 946600000 -R A -A RX
USRP side: A
FPGA clock: 52000000
Decimation: 192
Antenna: TX/RX
error: usrp_source::tune

DB is connected to side A, but tune() fails.

*Test case 2 - only DB1 is connected in USRP side B

*Attempt to run OpenBTS:
*
*Starting the system...
1266438092.1164 INFO 3086882624 TRXManager.cpp:254:sendCommandPacket:
command CMD POWEROFF
1266438092.1217 FORCE 3086087888 Logger.cpp:90:gSetLogFile: setting log
path to /dev/null
1266438093.1657 WARNING 3086882624 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266438094.1880 WARNING 3086882624 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266438095.2100 WARNING 3086882624 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266438096.2316 WARNING 3086882624 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
dac_rate(): 104000000
dac_rate(): 104000000
1266438097.2548 WARNING 3086882624 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266438097.2590 INFO 3086882624 TRXManager.cpp:254:sendCommandPacket:
command CMD SETTSC 0
1266438097.2632 INFO 3086882624 TRXManager.cpp:254:sendCommandPacket:
command CMD RXTUNE 890200
1266438097.2763 ALARM 3086882624 TRXManager.cpp:359:tune: RXTUNE failed
with status 1
1266438097.2764 INFO 3086882624 TRXManager.cpp:254:sendCommandPacket:
command CMD SETSLOT 0 5
1266438097.2806 INFO 3086882624 TRXManager.cpp:254:sendCommandPacket:
command CMD POWERON
1266438097.2847 ALARM 3086882624 TRXManager.cpp:411:powerOn: POWERON
failed with status 1
1266438097.2847 INFO 3086882624 TRXManager.cpp:254:sendCommandPacket:
command CMD SETPOWER 0
1266438097.2888 ALARM 3086882624 TRXManager.cpp:424:setPower: SETPOWER
failed with status 1
1266438097.2891 INFO 3086882624 GSMLogicalChannel.cpp:42:open:

So there are lots of failures and when USRP is disconnected, CLI detects
nothing* *and is still active.

Attemtps to run Kalibrator:
[root@openBTS kal-0.2]# ./kal -f 946600000
USRP side: B
FPGA clock: 52000000
Decimation: 192
Antenna: RX2
error: usrp_source::tune

[root@openBTS kal-0.2]# ./kal -f 946600000 -A RX
USRP side: B
FPGA clock: 52000000
Decimation: 192
Antenna: TX/RX
error: usrp_source::tune

[root@openBTS kal-0.2]# ./kal -f 946600000 -R A
USRP side: A
FPGA clock: 52000000
Decimation: 192
Antenna: RX2
Sample rate: 270833.343750
error: fcch not detected in 20 frames

[root@openBTS kal-0.2]# ./kal -f 946600000 -R A -A RX
USRP side: A
FPGA clock: 52000000
Decimation: 192
Antenna: TX/RX
Sample rate: 270833.343750
error: fcch not detected in 20 frames*

**Test case 3 - only DB2 is connected in USRP side A*
*
*OpenBTS*

*Starting the system...
1266438821.8364 FORCE 3087906512 Logger.cpp:90:gSetLogFile: setting log
path to /dev/null
1266438821.8369 INFO 3087877952 TRXManager.cpp:254:sendCommandPacket:
command CMD POWEROFF
1266438822.8586 WARNING 3087877952 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266438823.8806 WARNING 3087877952 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266438824.9027 WARNING 3087877952 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266438825.9245 WARNING 3087877952 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
dac_rate(): 104000000
dac_rate(): 104000000
1266438826.9477 WARNING 3087877952 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266438826.9522 INFO 3087877952 TRXManager.cpp:254:sendCommandPacket:
command CMD SETTSC 0
1266438826.9568 INFO 3087877952 TRXManager.cpp:254:sendCommandPacket:
command CMD RXTUNE 890200
1266438826.9693 INFO 3087877952 TRXManager.cpp:254:sendCommandPacket:
command CMD TXTUNE 935200
dac_rate(): 104000000
1266438826.9816 INFO 3087877952 TRXManager.cpp:254:sendCommandPacket:
command CMD SETSLOT 0 5
1266438826.9858 INFO 3087877952 TRXManager.cpp:254:sendCommandPacket:
command CMD POWERON
1266438827.1147 INFO 3087877952 TRXManager.cpp:254:sendCommandPacket:
command CMD SETPOWER 0
1266438827.1248 INFO 3087877952 GSMLogicalChannel.cpp:42:open:*

*Its the same like test case 1,* *I can scan OpenBTS with MS and
disconnected USRP power (USB cable) messes with errors:
fusb::_reap: No such device
fusb::_reap: No such device
fusb::_reap: No such device

Kalibrator:

[root@openBTS kal-0.2]# ./kal -f 946000000
USRP side: B
FPGA clock: 52000000
Decimation: 192
Antenna: RX2
Sample rate: 270833.343750
error: fcch not detected in 20 frames

[root@openBTS kal-0.2]# ./kal -f 946000000 -A RX
USRP side: B
FPGA clock: 52000000
Decimation: 192
Antenna: TX/RX
Sample rate: 270833.343750
error: fcch not detected in 20 frames

[root@openBTS kal-0.2]# ./kal -f 946000000 -R A
USRP side: A
FPGA clock: 52000000
Decimation: 192
Antenna: RX2
error: usrp_source::tune

[root@openBTS kal-0.2]# ./kal -f 946000000 -R A -A RX
USRP side: A
FPGA clock: 52000000
Decimation: 192
Antenna: TX/RX
error: usrp_source::tune

*Test case 4 - only DB2 is connected in USRP side B

*OpenBTS*
*
Starting the system...
1266439630.8798 INFO 3087316800 TRXManager.cpp:254:sendCommandPacket:
command CMD POWEROFF
1266439630.8816 FORCE 3087140560 Logger.cpp:90:gSetLogFile: setting log
path to /dev/null
1266439631.9024 WARNING 3087316800 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266439632.9264 WARNING 3087316800 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266439633.9491 WARNING 3087316800 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266439634.9707 WARNING 3087316800 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
dac_rate(): 104000000
dac_rate(): 104000000
1266439635.9923 WARNING 3087316800 TRXManager.cpp:271:sendCommandPacket:
retrying transceiver command after response timeout
1266439635.9969 INFO 3087316800 TRXManager.cpp:254:sendCommandPacket:
command CMD SETTSC 0
1266439636.0023 INFO 3087316800 TRXManager.cpp:254:sendCommandPacket:
command CMD RXTUNE 890200
1266439636.0313 ALARM 3087316800 TRXManager.cpp:359:tune: RXTUNE failed
with status 1
1266439636.0314 INFO 3087316800 TRXManager.cpp:254:sendCommandPacket:
command CMD SETSLOT 0 5
1266439636.0356 INFO 3087316800 TRXManager.cpp:254:sendCommandPacket:
command CMD POWERON
1266439636.0397 ALARM 3087316800 TRXManager.cpp:411:powerOn: POWERON
failed with status 1
1266439636.0397 INFO 3087316800 TRXManager.cpp:254:sendCommandPacket:
command CMD SETPOWER 0
1266439636.0439 ALARM 3087316800 TRXManager.cpp:424:setPower: SETPOWER
failed with status 1
1266439636.0442 INFO 3087316800 GSMLogicalChannel.cpp:42:open: *

*Same like test case 2  when USRP is disconnected, CLI detects nothing*
*and is still active.
*
*Kalibrator

[root@openBTS kal-0.2]# ./kal -f 946000000
USRP side: B
FPGA clock: 52000000
Decimation: 192
Antenna: RX2
error: usrp_source::tune

[root@openBTS kal-0.2]# ./kal -f 946000000 -A RX
USRP side: B
FPGA clock: 52000000
Decimation: 192
Antenna: TX/RX
error: usrp_source::tune

[root@openBTS kal-0.2]# ./kal -f 946000000 -R A
USRP side: A
FPGA clock: 52000000
Decimation: 192
Antenna: RX2
Sample rate: 270833.343750
error: fcch not detected in 20 frames

[root@openBTS kal-0.2]# ./kal -f 946000000 -R A -A RX
USRP side: A
FPGA clock: 52000000
Decimation: 192
Antenna: TX/RX
Sample rate: 270833.343750
error: fcch not detected in 20 frames

Thanks,
Tomas