[USRP-users] Using the SC12 OTW format

mleech at ripnet.com mleech at ripnet.com
Thu Sep 25 10:56:50 EDT 2014


SC12 is only available, as far as I know, on B2xx. 

Not sure about plans to augment the converters. 

On 2014-09-25 10:46, Robert Kossler via USRP-users wrote: 

> Hi, 
> I have a B210 and just started to experiment with the 'sc12' wire format for receiving data (where the data values are packed into 3 bytes/sample rather than 4 bytes/sample). This seems to work fine with the benchmark_rate and rx_samples_to_file sample programs as long as the CPU format is 'fc32'. If the CPU format is 'sc16', UHD generates an error saying essentially that there is no converter defined for going from 'sc12' to 'sc16'. I am wondering if there are any plans to add this converter. 
> I'm also wondering if this 'sc12' OTW format can be used with other devices like X310. I realize that there will be a slight loss of precision when packing the data into 12-bit values, but the increased bandwidth may make it worthwhile. I am thinking in particular about a use case where I would be using the 1GbE port rather than the 10GbE in a portable setup where I have a laptop rather than a desktop PC. It seems I would be able to get nearly 20MS/s (2 channel) transfer rates using this OTW format. 
> Rob 
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