[USRP-users] USRP x310 RF A TX Red LED

Martin Braun martin.braun at ettus.com
Mon Oct 13 11:38:01 EDT 2014

A green LED means receive, and a red LED means transmit. In the early
versions of the X300 code, this was accidentally flipped, which was not
a problem per se, but inconsistent with our other devices.
So no, a red TX LED is not bad, no worries!

As for the bug you see with 'only receiving noise', that's strange and
probably not connected to the LED colour. There's a chance some gain
settings changed across versions, although I haven't heard that before.
Maybe you can elaborate on your test setup.


On 10/10/2014 11:04 PM, Ryan Marlow via USRP-users wrote:
> Hey All,
> I'm playing around with different versions of the released UHD. I have a
> simple flowgraph in GNU Radio with a USRP source and sink. and the TX
> and RX are looped together. I'm trying to just get dataflow through the
> USRP. UHD 3.7.1 seems to work great. The signal I send to the USRP
> matches what the USRP sends back to GNU Radio, great! But in UHD 3.7.2
> and 3.7.3 the TX LED is red instead of green and I appear to just be
> getting noise back to the host. What exactly does the RED LED indicate
> (I'm sure it's bad)? In all cases, I run the uhd_usrp_probe utility tool
> and no significant errors result from that. I'm not sure what I'm doing
> wrong.
> Thanks,
> Ryan Marlow
> -- 
> Ryan L. Marlow
> Research Assistant in CCM Lab <http://ccm.ece.vt.edu>
> Virginia <http://www.vt.edu/> Polytechnic Institute and State University
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