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

[Cory Struth]

We have witnessed this exact behavior with our 7750 SRC-12s on numerous
occasions when we lose site AC at our remote substations or radio sites.
For some reason the router locks out and we have to roll a truck to
physically reset the power switches off, then back on, at which time the
router will reboot and come up clean. We have not experienced losing any
MDAs however. 7705 SAR8s do not have this issue and will immediately come
back up upon receiving -48v.

In our subsequent testing in our lab we found the SRC-12s to run down until
about -38.5V before failing. We passed this information upstream to ALU and
were told the power supplies were OEMd from various manufacturers and there
was no solution to the lockout. We've since invested in extra gen-set
maintenance to ensure that when site AC is lost, we rarely lose our DC bus.

Hope this helps.

Cory Struth
Network Architect
AltaLink Management Ltd
Calgary Alberta Canada
cory.struth at altalink.ca
403.998.3889 (mobile)



On Wed, Jun 26, 2013 at 11:25 PM, Koch, Andrew
<andrew.koch at tdstelecom.com>wrote:

> 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
>
> MASERGY Customer Support Center
> USA +1 877 462 7374
> Europe +44 (0) 207 173 6888
> Email csc at masergy.com
>
>
>
> -----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
> >
> >
> >
> > _______________________________________________
> > alcatel-nsp mailing list
> > alcatel-nsp at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/alcatel-nsp
>
> _______________________________________________
> alcatel-nsp mailing list
> alcatel-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/alcatel-nsp
>
> _______________________________________________
> alcatel-nsp mailing list
> alcatel-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/alcatel-nsp
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/alcatel-nsp/attachments/20130627/6189c9cb/attachment.html>