It seems like I had a discussion a while back where it was described that burst mode needs to have some padding before and after the actual burst packet. I'm now getting back into some burst mode work and am wondering why the padding was needed, or if I have misremembered the conversation. What I have been seeing is that if my burst packet is not padded, the X310 seems to not transmit all of the packet (or maybe the stream isn't providing it all of the data to the USRP?). If I add zero padding to before and after the actual data, it seems to transmit the whole packet.
Does anyone know if the USRP needs a specific amount of padding (before and after)? And does the padding need to be included in the burst tags? Is it better to use packet_len rather than SOB/EOB, or just different? It would be nice to have a direct PDU input to the USRP to identify a burst rather than changing it to a stream right before the USRP. I'm using an X310 with GNU Radio v3.8.5.0 and UHD v4.0. Currently, my packet is using the tx_sob and tx_eob tags, and the padding is included within them. Thanks, Jeff
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