Conference netcad::hub_mgnt

3470.0. "DECHUB900 not powering up after power failure !!" by SIOG::ODONNELL () Wed Apr 17 1996 11:16

    Hi,
    
    	Hopefully somebody can shed a light on a problem I'am having.A
    customer of mine has a DECHub 900 with the following Config.
    
    Slot	Card
    1		DecSwitch 900-ef
    2		PortSwitch 900-tp
    3		Decrepeater90T
    4		PortSwitch 900-cp
    5		PortSwitch 900-cp
    6		Decrepeater 900-TM
    7		Decconcentrator 900MX
    8			empty
    
    
    The Hub as 3 Power supplies and show N+1 on the management Module.After
    2 recent power losses to the hub the Hub would not power up.the only
    indication were on the AC leds on the Power Supplies There were no DC
    leds on at all.As each PSU was physically  removed and then
    re-connected it's DC led would come on and only when ALL PSU's had this
    treatement was the hub able to power up successfully.
    
    Has any one come across this problem before and if so is there a cure
    or an easy method to identify the cause of the problem ?.
    
    					Thanks in Advance
    
    					Brendan
    

    What kind of power supplies are being used in the HUB. Are they
    H7890's or H7894's? Are they a mix of the 2 types of supplies.
    I personally don't know of a problem like this or have the answer,
    but I can forward this to someone who may be able to help with
    some kind of answer.
    
    Bob

    Hi Bob,
    
    	Sorry for the delay in getting back to you.The Customer has 3 *
    H7890-MA's in the hub.The Management Unit shows N+1 and 158.7W
    available.
    
    				Regards
    
    				Brendan.
    

    Can the customer re-create the problem by simply un-plugging
    the ac cord from the hub? This would be as close as I can think 
    of to simulating the 2 power outages where I presume that the 
    customer discovered after the power was restored that the hub
    didn't power back up.
    
    Bob