[alcatel-nsp] Low voltage condition causes CPM2 and IOM2 to fail

[Koch, Andrew]

Hi Jim,
 
Both incidents happened due to unusual circumstances with the office power, where voltage and amperage were lower than typically expected. 

However, I would expect that upon restoral of the DC power system to a fully-operational state, that the router would boot without needing to replace several hardware components. 
 
Andy



 -----Original Message-----
From: 	Jim Cardona [mailto:JCardona at masergy.com]
Sent:	Wednesday, June 26, 2013 09:14 PM Central Standard Time
To:	Dan Snyder; Koch, Andrew
Subject:	RE: [alcatel-nsp] Low voltage condition causes CPM2 and IOM2 to fail

Andy,

Make sure you have enough amperage to power these cards, check the wire gauge; voltage is not enough.  

Good Luck,
 
Jim Cardona
Senior Network Engineer
Email Jim.Cardona at masergy.com
Office +1 214 442 5661
Mobile +1 972 672 1759



www.masergy.com

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-----Original Message-----
From: alcatel-nsp [mailto:alcatel-nsp-bounces at puck.nether.net] On Behalf Of Dan Snyder
Sent: Wednesday, June 26, 2013 6:14 PM
To: Koch, Andrew
Cc: alcatel-nsp at puck.nether.net
Subject: Re: [alcatel-nsp] Low voltage condition causes CPM2 and IOM2 to fail

We might have just seen this. The cards never boot and have to be replaced?

Отправлено с iPhone

Jun 26, 2013, в 5:10 PM, "Koch, Andrew" <andrew.koch at tdstelecom.com> написал(а):

> We have run into a couple instances where on a -48v DC system, we have had the office voltage drop below 42v.  When this occurs, the CPM2 and IOM2 on our 7750 routers fail to restore when appropriate power levels are restored.  In both instances, multiple components (both CPMs, or multiple IOMs) have simultaneously failed to boot on the chassis. These failed components do not POST.  It appears some type of memory corruption or zeroing occurs.
> 
> Has anyone else seen these troubles?
> 
> Thanks for any thoughts.
> 
> Andy Koch
> TDS Telecom - IP Network Operations
> andrew.koch at tdstelecom.com
> 
> 
> 
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