LLLL error printout

GNU Radio
1

Hello,
Very quick question, I’m trying to transmit a signal that I have
created,
and in the console output at the beginning of the transmission, I get
this
printout: LLLLLLLLLL. The error is not continuous, it stops after about
10
L’s. What does this mean?
Thanks,
-Anisha

2

On 08/24/2012 09:12 AM, Anisha G. wrote:

Hello,
Very quick question, I’m trying to transmit a signal that I have created,
and in the console output at the beginning of the transmission, I get this
printout: LLLLLLLLLL. The error is not continuous, it stops after about 10
L’s. What does this mean?

The transmitted packet had a timestamp that was late, ie the packet time
was > the time on the USRP.

-josh

3

Hi Josh,

I also meet the “L” output. Does this mean the USRP cannot send the
packet
out in time? What should I do to depress or avoid this error message?

Furthermore, can you explain the meaning of “U” and “O” output to the
console?

–
Yang, Qing
Information Engineering, CUHK

2012/8/25 Josh B. [email protected]

4

On 08/25/2012 01:58 AM, Qing Y. wrote:

Hi Josh,

I also meet the “L” output. Does this mean the USRP cannot send the packet
out in time? What should I do to depress or avoid this error message?

Can you share under what conditions this occurs? For example, are you
experimenting with the stream tags? What hardware is involved?

There is a measurable latency between host and USRP. The time on the
packet should be greater than current usrp time + latency + some
epsilon.

Furthermore, can you explain the meaning of “U” and “O” output to the
console?

http://files.ettus.com/uhd_docs/manual/html/general.html#overflow-underflow-notes

http://files.ettus.com/uhd_docs/doxygen/html/metadata_8hpp.html

-josh