# N210 stuck at max of 25MS/s

**URL:** <https://www.ruby-forum.com/t/n210-stuck-at-max-of-25ms-s/217446>\
**Category:** GNU Radio\
**Created:** [March 1, 2012, 6:24pm UTC](https://www.ruby-forum.com/t/n210-stuck-at-max-of-25ms-s/217446 "2012-03-01T18:24:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\
**Post date:** [March 1, 2012, 6:24pm UTC](https://www.ruby-forum.com/t/n210-stuck-at-max-of-25ms-s/217446/1 "2012-03-01T18:24:39Z")

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Hi there people,  
I’m helping some friends here at work, they are doing an experiment with  
the N210 and grabbing the data as 16bit complex samples.  
The maximum symbol rate they are achieving is 25MS/s.  
Is this correct? At 33.3 and 50 the uhd\_fft just locks up, showing no  
data  
at all. We thought till 50MS/s was a supported rate.

Software are very recent git gnuradio and uhd.  
The Gigabit is a “e1000e” driven card.  
Btw, what linux distro do you recommend?

Best regards,  
Rafael D.

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**Author:** ![rubyisking](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/dec6dc/32.png) [@rubyisking](https://www.ruby-forum.com/u/rubyisking)\
**Post date:** [March 1, 2012, 6:45pm UTC](https://www.ruby-forum.com/t/n210-stuck-at-max-of-25ms-s/217446/2 "2012-03-01T18:45:05Z")

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On 03/01/2012 09:23 AM, Rafael D. wrote:

> Hi there people,  
> I’m helping some friends here at work, they are doing an experiment with  
> the N210 and grabbing the data as 16bit complex samples.  
> The maximum symbol rate they are achieving is 25MS/s.  
> Is this correct? At 33.3 and 50 the uhd\_fft just locks up, showing no data  
> at all. We thought till 50MS/s was a supported rate.

Set the “over-the-wire” type to sc8 mode for rates over 25Msps.  
Otherwise, you have ethernet bus contention.

Stream args is one of the constructor parameters for the source and sink  
blocks.  
[http://files.ettus.com/uhd\_docs/doxygen/html/structuhd\_1\_1stream\_\_args\_\_t.html#a0ba0e946d2f83f7ac085f4f4e2ce9578](http://files.ettus.com/uhd_docs/doxygen/html/structuhd_1_1stream __args__ t.html#a0ba0e946d2f83f7ac085f4f4e2ce9578)

-Josh