[USRP-users] Sequence Errors on USRP N200

Jahshan Bhatti jabhatti91 at gmail.com
Sun Jun 24 14:32:51 EDT 2012


On Sun, Jun 24, 2012 at 11:21 AM, Josh Blum <josh at ettus.com> wrote:

>
>
> On 06/23/2012 09:59 PM, Jahshan Bhatti wrote:
> > Hi all,
> >
> > I'm writing a program to delay and playback received samples continuously
> > with the USRP N200. Everything seems to be working fine, except for the
> > occasional sequence error. Why does this happen? Is the network layer
> > dropping or reordering packets?
> >
>
> Correct, this would probably be a dropped packet.
>
> You might expect packets to get re-ordered and even dropped when UDP is
> sent out into the internet and taking different paths to get to the
> destination, etc.
>
> But this is a direct point to point link. So, you might have one of
> those less than perfect ethernet cards that on occasion, drop packets.
> Some applications would re-send, some would silently drop (like skype),
> USRP is just one of the few devices that reports the event.
>
> -josh
>
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>

Thanks Josh. I've got the USRP plugged through a router, and I was able to
correlate the sequence errors with increased network traffic. I guess I'll
have to use a direct point to point link.

~Jahshan
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