I am getting some “UUU” at the beginning of a transmission stream and a
lot of “DDDD” during the simultaneous reception stream.
I am sending and simultaneously receiving a BPSK stream at 10 MSample/s
on USRP N210.
I checked that I have the string @my_user_group - rtprio 99 in
/etc/security/limits.conf and that I am running as a user in
I also checked the status of eth0, when connected to the powered USRP
N210. Here the output of ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Link partner advertised link modes: 1000baseT/Half 1000baseT/Full
Link partner advertised pause frame use: Transmit-only
Link partner advertised auto-negotiation: Yes
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Cannot get link status: Operation not permitted
If I issue ethtool -a eth0 I get the reply: “Pause parameters for eth0:
Cannot get device pause settings: Operation not supported”
If I analyze the received data I don’t see any troubles due to the
“DDDDDD”, while I can recognize some artifacts due to the few “UUU” at
the beginning of the transmission.
If I reduce the sample rate I am able to have the “DDDDD” disappeared,
but the “UU” are still present.
Can someone help me in understanding what I have to do to solve my