Hi
We have configured OsmoNITB, OsmoBTS and OsmoTRX to run two transceivers using UmTRX. But somehow when the spectrum is monitored, the only frequency that is detected is the one TRX0 is tuned to. ARFCN set for TRX1 is not detected i.e. TRX1 does not seem to be transmitting on the specified frequency.
Can anyone please tell what possibly could be the issue?
Thanks & Regards,
Amber & Sarosh
Hello Amber & Sarosh
You have to add these lines below into */etc/osmocom/openbsc.cfg *right
after trx0 configuration
trx 1
rf_locked 0
arfcn 184 (*set the right ARFCN for you here* )
nominal power 23
max_power_red 0
rsl e1 tei 0
timeslot 0
phys_chan_config TCH/F
timeslot 1
phys_chan_config TCH/F
timeslot 2
phys_chan_config TCH/F
timeslot 3
phys_chan_config TCH/F
timeslot 4
phys_chan_config TCH/F
timeslot 5
phys_chan_config TCH/F
timeslot 6
phys_chan_config TCH/F
timeslot 7
phys_chan_config TCH/F
And add into *etc/osmocom/osmo-bts.cfg*
trx 1
rxgain 12
power 0
restart services:* sudo sv restart osmo-trx osmo-bts osmo-nitb*
Regarding trx band dividing, theoretically it might possible but we haven't
tested that
--
Best regards,
Andy
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Further details can be obtained from
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--
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============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)
Tom Tsou <tom <at> tsou.cc> writes:
>
> On Tue, Jun 3, 2014 at 12:18 PM, Yavuz Mert <yavuzmertt <at> gmail.com> wrote:
> > Hi all,
> > Can I use the two transceivers of UmTrx as two different BTS using
osmobts-trx
> > and osmo-trx.(Having different ipa-unit-id's)
> > I considered running single osmo-trx and two instances of osmobts-trx which
> > would require hacking UDP port numbers for clock, ctrl and data ports,
sending
> > clock indication to both osmobts-trx instances from osmo-trx.
> > Or maybe there is already a saner method i could not figure
>
> Right now you can only drive the separate RF paths as two TRX units
> controlled by one osmobts instance. Communicating with each TRX
> independently with multiple osmobts instances is not supported. The
> reason for this is that are some operations (e.g. thread setup) that
> are tied to TRX0 with the expectation of a single C0 setup rather than
> completely independent configuration of channels.
>
> -TT
>
>
Hi Tom,
Can you please elaborate a little "how can i drive the seperate RF paths as
two TRX units controlled by one osmobts instance?"
i have tried setting the configuration file for osmobts-trx (osmo-bts.cfg)
by adding 'trx 1' section at the end, but i got an error when starting
osmobts. i was not able to find any documentation regarding this setup.
further fairwaves umtrx hardware supports 2 seperate RF paths, does that
mean that i can use fairwaves umtrx hardware with single osmo-trx and single
osmobts instance?
thanks,
Arif
Hello All!
Where i can find information about fpga and firmware architecture?
I will be grateful for any information :)
С уважением,
alex korolev
nik135(a)mail.ru
Hi Josh,
On Tue, Apr 8, 2014 at 11:00 PM, Josh Blum <josh(a)joshknows.com> wrote:
> Hey guys,
>
> Please CC whoever appropriate.
>
> I have been looking over the u2plus_core.v and u2plus_umtrx_v2.v files
> with the intention of updating the vita rx/tx chains and dsp chains. I
> noticed a few interesting things about the clocking and I just wanted to
> confirm some of my assumptions, a few possible changes, and possibly
> share some knowledge.
>
> 1) vita chain/dsp core
> Inside the u2plus_core.v, there is a 13MHz clock (lms_clk) that is used
> to clock the time core and the dsps. The vita chain is clocked at 104MHz
> (dsp_clk). So for example, when the dsp strobes out 1 sample, does the
> vita_rx_chain see 8 of the same sample?
>
> My immediate concern is updating the vita and dsp chains. So, I really
> just need to understand the interaction between the dsp and the vita
> chain since they are crossing this 104/13Mhz clock domain.
>
> 2) usrp3 style vita framing/deframing
> Some time after umtrx was released, B200 came out. The FPGA architecture
> in B200 was changed from the earlier models to address dealing with
> these integrated frontend chips. Specifically, the ADC, DAC, DSP, and
> framing can all run on the same clock domain at full sample rate. This
> is accomplished because the vita framing happens on 64-bit wide bus to
> deal with the overhead of VITA headers. I suspect this architecture
> would be better fitting for the UmTRX.
I think the B200 architecture is better for UmTRX, but I'll let Andrew
and Sergey to decide, as they know the FPGA code much better.
> 3) u2plus_umtrx_v2.v
> It looks like the ADC and DAC IQ signals are clocked in/out on the
> positive and negative edges of the 13MHz clock. This is accomplished
> using a 26 MHz clock. So technically, this is another clock domain
> crossing between the 13/26MHz for the ADC/DAC signals. So, you should be
> able to accomplish the same effect in with just the 13MHz clock using
> the ODDR2 and IDDR2 xilinx modules.
>
> 4) digital loopback options?
> I was looking for a way to do a digital loopback inside the LMS. I wasnt
> sure if it was possible. Basically, if I set some value on the DAC pins,
> can I get the same value of the ADC pins? I saw registers for baseband
> loopback, but I think thats all analog. The idea is to self-test the bus
> timing by putting a test word into the IOs.
Unfortunately, there is no digital loopback in the LMS.
As you correctly note, the baseband loopback is actually analog.
> ---
> In any case, the most important issue is #1. I want to have a host build
> and image that is fully functional with latest UHD, lets say next week.
> And I would like to be able to first verify with your team that we
> havent lost any functionality, before further changes like the timed
> command core. Sounds OK to you?
Ok with me.
> Thanks,
> -josh
>
>
>
>
--
Regards,
Alexander Chemeris.
CEO, Fairwaves, Inc. / ООО УмРадио
https://fairwaves.co
Alex,
On Thu, Feb 20, 2014 at 11:33 AM, alex korolev <nik135(a)mail.ru> wrote:
> When i exec 'tx_waveforms.exe --wave-type SINE --wave-freq=100000
> --freq=300000000 --rate 1000000 --bw 20000 --ampl 0.7' I get a sine wave at
> the desired frequency, but it have a jitter.
> It is a normal behavior?
Most likely this is fine. Check spectrum picture with a spectrum
analyzer to see if there is any noise which might cause this.
> The little jpeg attached :-)
It's an avi, not a jpeg ;)
> ps. I have not found information on calibration,
> tell me how to make sure that the device is calibrated??
We're preparing a short manual about the calibration. Skilled and
impatient could refer to the LMS6002D calibration guide for details.
--
Regards,
Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио
http://fairwaves.ru
Hello
i installed all the package of openBTS and it was working properly, but
last time i take the server and connect the Umtrx module, the ping command
work properly, uhd_find_devices also work but i have this masseage: transceiver
; no process found... and after a long message comes telling me that the
network is unreachable. Just last week all this was working properly.
Can someone tell me ho to fix it please? or do i need to flash again the
module Umtrx?
