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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

2980.0. "Power glitch/power off no power on" by PTOJJD::DANZAK () Tue Nov 14 1995 21:17

    We have a HUB that has a:
    
    1.) Roamabout
    2.) 900FP Repeater
    3.) 900TM Network Access Server
    4.) 900EE DECswitch
    5.) 900TX DECswitch
    6.) 900EF DECswitch
    7.) 900MX DECconcentrator (6 MMF PMDs)
    8.) 900GM DECrepeater
    
    The hub has 4 of the older power supplies (H7890) and was upgraded to
    the new firmware etc.  (CONsolitated 4.1.1)
    
    When I take out the 900TX and pop it back in, all modules from the
    900TX down to the module in slot 2 power off.  The only way to get 'em
    to power on is to take out modules in slots 2,3,4 and 5 - put in the
    module in slot 5 (the TX) then go back down the line and put in slotes
    4,3,2.
    
    Is that a bug?  Known/unknown?
    
    Thanks,
    j
T.RTitleUserPersonal
Name		DateLines
2980.1Whack! whack! Don't do that! :^)NETCAD::BATTERSBYWed Nov 15 1995 12:3214
    Jon, you should know better than to create problems. lottsa :-)'s
    
    > When I take out the 900TX and pop it back in, all modules from the
    > 900TX down to the module in slot 2 power off.
    
    Remember when you were a kid and you went to your mother complaining
    about how your head hurt when you banged it against the wall, and
    she told you, "don't do that!", well....Don't do that! :-)
    All kidding aside, I don't know of any reason related to the 900TX
    itself that would cause this problem. Perhaps the MAM folks can say
    whether this is something that could happen (infrequently depending 
    on certain configs).
    
    -Bob
2980.2Not knownNETRIX::"boyle@dechub.lkg.dec.com"Chip BoyleWed Nov 15 1995 14:3219
John,
No this is not a known bug in the MAM.  I tried to reproduce this problem with
no success.  It appears that the 900TX was asking for some unknown amount of 
power.  This caused the Power Manager to power down all of the 900-style 
modules to the left of the 900TX.  It is possible that a pin on the bottom 
row of the 160-pin connector was either seated improperly, or bent (to some 
degree).  Removing and inserting the module may have caused the pins to 
properly connect.

You may want to check the bottom row of pins on the 900TX, and make sure the
hub has stiffeners.  If this happens again in the future, you should check
your LCD power display, and the chasPowerSinkWattage for the module in
question.  A future version of the MAM will tell the user, via the LCD, that
a module is bad and should be removed.

Hope this helps,
Chip Boyle
 
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