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Conference netcad::hub_mgnt

Title:DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:NETCAD::COLELLADT
Created:Wed Nov 13 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:4455
Total number of notes:16761

3464.0. "Hub900 48Volt loss" by SNOFS2::OLEARY () Wed Apr 17 1996 00:50

    Hi
    
    The event display mode of a DEChub 900 (sn: AS43721159) has been
    reporting "loss of 48 volt supply" errors. These errors caused the
    whole hub to reboot intermittently.
    
    Problem was resolved by changing one of the three H7890-MA power
    supplies.
    
    Config:
    
    Slot	Option
    
    
    1		DECbrouter 90T1
    2
    3
    4		DECrepeater 90T+
    5
    6		DECrepeater 900FP
    7		DECbridge 900MX
    8		DECbridge 900MX
    
    3 * H7890-MA	N+1 power
    
    
    Given that the Hub has N+1 power our customer has queried why a single
    supply would cause this problem. Is it possibly related to the Power
    distribution FCO which has just been released - the serial indicates
    that it is one of those affected.
    
    
    
Any ideas appreciated,
    Thanks,
    
    Patrick
T.RTitleUserPersonal
Name		DateLines
3464.1need more infoNETRIX::"boyle@dechub.lkg.dec.com"Chip BoyleThu Apr 18 1996 14:4914
Patrick,
The "loss of 48 volt supply" console event does not look familiar.
What was the firmware version in the DEChub 900?  Does the error
log have any power supply related errors?  Also, what happened to 
the bad power supply (H7890-MA) that was swapped out?

Thanks,
Chip





[Posted by WWW Notes gateway]
3464.2Firmware=3.1.0,no pwr supply errorsSNOFS2::OLEARYMon Apr 22 1996 23:0812
    Chip,
    	Firmware version is 3.1.0
    	No power supply errors were evident when error log was dumped, only
    84 occurrences of the "loss of 48 volt supply error".There were no
    further occurrences of this error once the power supply in slot 1 was
    swapped.
    Unfortunately the suspect power supply has been returned to logistics
    /repair centre and the chances of getting it back are slim.
    
    Thanks for your help,
           
    Patrick
3464.3Power supply isolated by trial & error?NETCAD::BATTERSBYDon't use time/words carelesslyTue Apr 23 1996 12:484
    Patrick, I presume that you isolated which power supply it appeared
    to be by removing them one at a time until the error went away?
    
    Bob