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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

1607.0. "a higher power H7890 coming?" by VAXRIO::ROLF (Vaporware Design Specialist) Mon Oct 24 1994 09:43

    How are plans to come out with a heftier power supply for the MS900
    coming along?
    
    With the DS900EF it is quite easy to need more than 3 x H7890's, hence
    no n+1 redundancy.
    
    Will the hub actually power up all modules, if the power capabilities
    of 3 supplies are exceeded, but less than 4?
    
    Thanks
    Rolf
T.RTitleUserPersonal
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1607.1NETCAD::SLAWRENCEMon Oct 24 1994 14:5910
    
    > Will the hub actually power up all modules, if the power capabilities
    > of 3 supplies are exceeded, but less than 4?
      
    No.
    
    Even with the new power supplies, this will still be true; the
    limitation is the AC input line filter, which is part of the hub
    backplane.
1607.2confused me!VAXRIO::ROLFVaporware Design SpecialistMon Oct 24 1994 15:2512
    Thanks -.1
    
    but I don't quite understand!
    
    IF a higher power supply comes into existance, we won't be able to use
    it because, as you say, the total current into the hub is still limited 
    by the AC line filter? If that is so, I don't see why we would bother 
    with a higher power supply in the first place!
    
    Got me confused!
    
    Rolf