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[Discuss-gnuradio] UHD: tx - sync via MIMO cable, rx - "We're marking it

From: Veljko Pejovic
Subject: [Discuss-gnuradio] UHD: tx - sync via MIMO cable, rx - "We're marking it DONE"
Date: Wed, 3 Nov 2010 09:11:10 -0700


Setup: Two USRP2 + WBX boards, one PC with Ubuntu 10.04, the latest
gnruadio/next and uhd from the github. The PC hosts two PCI express
GigEthernet cards, which are connected to the two USRP2s.

I'm using UHD to tx/tr with two boards simultaneously. I'm working
with Multi USRP source and sink from the GRC. I have two problems in
my examples:

1) The tx part works except for the synchronization. I have a MIMO
cable and I though about using it for that. However, it seems that
Multi USRP sink does not see the cable. Is it possible to use this
cable for sync purposes? Alternatively, is there a way to get rid of
the one of the GigE cards and get the data through the mimo cable to
the other device (I know that this is the original MIMO cable idea,
it's just that I haven't heard about any successful attempts).

2) The receiver gives me this nasty "We're marking it DONE" error
message, that a few people reported earlier. Before trying out some of
the posted solutions, are there any solutions to the problem that do
not require changing C code and recompiling the whole thing?



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