# BitRate USRP N210

**URL:** <https://www.ruby-forum.com/t/bitrate-usrp-n210/243246>\
**Category:** GNU Radio\
**Created:** [September 4, 2015, 5:49am UTC](https://www.ruby-forum.com/t/bitrate-usrp-n210/243246 "2015-09-04T05:49:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\
**Post date:** [September 4, 2015, 5:49am UTC](https://www.ruby-forum.com/t/bitrate-usrp-n210/243246/1 "2015-09-04T05:49:16Z")

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Hello,

What is the minimum bit-rate of the N210 ? There is any formula to  
define  
it ?

The N210 has 16 bit samples (limited by the host-GigE) so up to 25MS/s.

C. Freq = 846.8 MHz  
Bandwidth = 1MHz  
Channel Bandwidth = 100 Hz  
Sample Rate (Fs) = 20KHz

Is that correct :  
BitRate = sample rate \* 16bit \* 2 ?  
BitRate = 20KHz \* 16 bit \* 2 = 6.4 Mbps

The speedometer shows 798 KB/s (6.384Mbps).

Thanks in advance

Abs

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**Author:** ![Abdeslam\_B](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/97f17d/32.png) [@Abdeslam\_B](https://www.ruby-forum.com/u/Abdeslam_B)\
**Post date:** [September 4, 2015, 9:31am UTC](https://www.ruby-forum.com/t/bitrate-usrp-n210/243246/2 "2015-09-04T09:31:51Z")

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Hi Abs,

there’s no minimum Bit rate, but a minimum Sample rate, which for Gen2  
devices such as the N2xx is Master Clock Rate / 512,  
ie. 100MHz/512 = 195312.5 Hz.

20kHz is significantly below that, so UHD will tell you that it actually  
set the sample rate to 195.3125 kHz when you try to set the sampling  
rate. Consequently, supplying only 20kS/s to the USRP will lead to a  
whole lot of underruns.

Best regards,  
Marcus