UmTRXv2 Beta: Whats the maximum # of simultaneous callers

Alexander Chemeris alexander.chemeris at
Tue Oct 30 09:07:23 UTC 2012


On Tue, Oct 30, 2012 at 12:36 PM, SoftwareRadioGuy
<softwaredefinesradio at> wrote:
> I've read that the # of maximum callers is 15.
> Since there are "Beta" version coming out will these be able to handle 15
> simultaneous callers too?

A short answer is "yes, after a software update".

A longer answer is that hardware supports dual-TRX operation, but
software support is not there yet. We might be able to fix software
before we ship beta units, but even if not - you will be able to get
the software update later.
Also keep in mind, that UmTRX should be able to run multi-ARFCN
OpenBTS and in this case it'll be able to handle much more calls. We
haven't tested this mode of operation extensively yet, but
theoretically we might be able to support 14ARFCNs (2x7ARFCN) which
equals to (14*8-1)=111 calls. At this scale you're most likely limited
by computing power of your PC rather then UmTRX hardware. Whether we
could get UmTRX in Multi-ARFCN mode through certification or not is
still a question, but it should be fine for lab testing.

Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио

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