Restarting the LTU
Look to the QPLL led in the Link RX, if this led is flashing then you have a LTU problem,
probably because you had a power cut and you need to restart reset the LTU So :
ssh to
lnxpool31.cern.ch open exceed and then run the folwing commands:
initttc export DISPLAY= your_computer_name:0 vmecrate ltu
then you should see a panel with the LTU config, just click
ttcreset button and then look and see if the QPLL led in the link receiver is on.
That's all folks