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[Discuss-gnuradio] USRP B210 "UHD Error: recv packet demuxer unexpected

From: Larry Van Der Jagt
Subject: [Discuss-gnuradio] USRP B210 "UHD Error: recv packet demuxer unexpected sid 0xff87ffc3"
Date: Thu, 19 Mar 2015 16:39:55 -0400


Running examples from:



With the the following changes:

1) Mb0 Clock sources in UHD:USRP source set to Default

2) Output of Polyphase decimator routed to new UHD:USRP Sink with sample rate set to 200k to match Polyphase Decimator rate and center frequency set to 93.9 MHz (source center frequency is 97.9 MHz in intended application, but problem also occurs when source and sink frequencies match)

System runs successfully for roughly 5 minutes and then errors with a series of:

UHD Error: recv packet demuxer unexpected sid 0xff87ffc3

Over and over.  Sometimes the sid listed is the same, sometimes it changes.

Running UHD 003.008.001-82-g9e6ff291 over GNURadio utilizing USB3 on I7 running Ubuntu 12.04 LTS.  The firmware loaded is the standard usrp_b200_fw.hex that came with the build.

I note this was looked at in:


but I do not find a resolution at that time .

Once this occurs it is necessary to unplug and replug the USB cable to get the system to operate again.

There are occasional   UUU OOO Ua during operation, but these occur albeit less frequently without the addition of the USRP Sink and I have not seen the sid error when this Sink is absent.

As always any links or info is welcomed.


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