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Current Status Summary

Modified 13:02, 19 Oct 2012 by horneff | Page History

    Version as of 14:42, 30 Apr 2024

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    Hardware Status as of 1. February 2012

    Electronics:

    All RCU modules plugged in.

    One HBA oscillating from time to time. Two HBAs with one broken modem each.

    Two LBAs were oscillating. Several LBAs with low power.

    High Band Antennas:

    All tiles are working.

    The tiles 40/41 and 68/69 have one broken modem each.

    The FE module 178/179-16 is oscillating. Tile 178/179 is sometimes oscillating at high power, this may (or may not) be caused bi FE module 178/179-16.

    Low Band Antennas:

    The LNAs of (the LBAs of) RCUs 74 and 112 were seen oscillating at some times.

    Some (even-numbered) dipoles show little to no power in the spectrum (like as if the LNA is not working). The problem is not always consistent: some seem to recover without active intervention, some seem to recover after pulling and re-connecting the RCU.

    Date RCUs with low power in rcumode 3
    Maintenance 16.10.2012 *       * * * * * * * * * * * * * *  
    Wed 1.02.2012         684 724   78       1044 1304 138 1482 150 1524   1784
    Wed 18.01.2012 * *   *   72   78         130 138 148 150 152   178
    Wed 21.9.2011 8 12 * 542 68 72   78 82       130 1381 148 150 1521 164 178
    Thu 11.8.2011 8 12 44 54   72   78 82 86     130 1381 148 150 1521 164 178
    Fri. 8.7.2011A 8 12 44   68 72 743 78 82 86     130   148 150 1522 164 178
    Mon 4.7.2011 8 12 44     72 741 78 822 86     130   148 150   164 178
    Fri 1.7.2011A 8 12 44   68 72   78   86     130   148 150   164 178
    Wed 29.6.2011A 8   44     72   78   86 92     138 148 150   164  

    Notes:
    A No attempt to recover signal by switching rcumodes done.
    1Recovered after switching to rcumode 1 and back (a number of times)
    2Showed changing power levels.
    3 At 50-50 MHz about 10-15 dB reduced at 20 MHz about 30 dB reduced.
    4 Normal power at some times, reduced power at others

    * Replaced during maintenance visit, or before

    Computer Status as of 20. January 2012:

    Data Taking PCs

    All lofarN machines are up

    All lofarN machines have new RAID disks configured ad RAID5 (12.7 TB storage space in total per machine).

    The lofarNa machines are installed and seem to be working.

    Server

    lofarsrv is up

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