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Re: [Discuss-gnuradio] USRP2 modulated signal tx error

From: Johnathan Corgan
Subject: Re: [Discuss-gnuradio] USRP2 modulated signal tx error
Date: Wed, 25 Mar 2009 12:09:36 -0700

On Wed, Mar 25, 2009 at 11:30 AM, Eric Blossom <address@hidden> wrote:

> There's a bug in the on-the-wire format for the USRP2 where we're not
> currently transmitting the valid length of the packet.  With ethernet,
> the minimum packet size is 64-bytes, and there are some times where
> the host code is naively fragmenting the received samples in a way
> that produces a packet that is too short for ethernet.
> I've opened ticket:378 on this.  It will be properly fixed when we
> rework the on-the-wire format as part of the VRT work, but I think
> there's an intermediate step that can avoid most cases of the problem
> happening.

I had planned to at least temporarily work around this for gr-usrp by
avoiding passing flowgraph data to libusrp2 that would result in these
short fragments.  This wouldn't fix things for low-level libusrp2
users, but it's a small change that would get us by until the real fix
with the new VRT transport work.  Let me know if this is an issue.


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