Re: Maximum sample rate for two channels

[Marcus D. Leech]

On 2022-10-03 12:10, isaac mario tupac davila wrote:
> Hello community
>
> I'm Isaac. I'm trying to receive a signal with two channels using an 
> USRP N200 and a Basic RX.
> I'm setting the sample rate of each channel to 20MSp/s, but what I 
> obtain is: The total sum of rates (40.000000 MSps on 2 channels) 
> exceeds the maximum capacity of the connection, causing overflow (O) 
> in the acquisition.
>
> So, How do I know which is the maximum capacity for two channels? Why 
> is it not possible to acquire two channels with a sample rate of 
> 20MSp/s in each one if I can acquire one channel with 20MSp/s?
>
> Thanks in advance
>
> Isaac T.
The maximum possible bit-rate for a 1GiGe connection is 1Gbit/sec.

The absolute most you can push over such a connection with the N200 is 
25Msample/second--with 16-bit I and Q.

If you move to 8-bit samples, using "otw_format=sc8" in your device 
arguments, you can move up to 50Msps over
  that same connection.

This is basically just the maximum delivered rate of a 1Gbit 
connection.  So, one channel at 25Msps or two channels at 12.5Msps,
  or if you're using sc8 "wire" format, 50Msps for one channel and 
25Msps for two channels.