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.<br>
<br>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.<br>
<br>Hope this helps.<br><br>Cory Struth<br>Network Architect<br>AltaLink Management Ltd<br>Calgary Alberta Canada<br><a href="mailto:cory.struth@altalink.ca">cory.struth@altalink.ca</a><br>403.998.3889 (mobile)<br><br><br>
<br><div class="gmail_quote">On Wed, Jun 26, 2013 at 11:25 PM, Koch, Andrew <span dir="ltr"><<a href="mailto:andrew.koch@tdstelecom.com" target="_blank">andrew.koch@tdstelecom.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Jim,<br>
<br>
Both incidents happened due to unusual circumstances with the office power, where voltage and amperage were lower than typically expected.<br>
<br>
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.<br>
<br>
Andy<br>
<br>
<br>
<br>
š-----Original Message-----<br>
From: š Jim Cardona [mailto:<a href="mailto:JCardona@masergy.com">JCardona@masergy.com</a>]<br>
Sent: š Wednesday, June 26, 2013 09:14 PM Central Standard Time<br>
To: š š Dan Snyder; Koch, Andrew<br>
Subject: š š š šRE: [alcatel-nsp] Low voltage condition causes CPM2 and IOM2 to fail<br>
<br>
Andy,<br>
<br>
Make sure you have enough amperage to power these cards, check the wire gauge; voltage is not enough.<br>
<br>
Good Luck,<br>
š<br>
Jim Cardona<br>
Senior Network Engineer<br>
Email <a href="mailto:Jim.Cardona@masergy.com">Jim.Cardona@masergy.com</a><br>
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<br>
<br>
<br>
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<br>
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<div class="HOEnZb"><div class="h5"><br>
<br>
<br>
-----Original Message-----<br>
From: alcatel-nsp [mailto:<a href="mailto:alcatel-nsp-bounces@puck.nether.net">alcatel-nsp-bounces@puck.nether.net</a>] On Behalf Of Dan Snyder<br>
Sent: Wednesday, June 26, 2013 6:14 PM<br>
To: Koch, Andrew<br>
Cc: <a href="mailto:alcatel-nsp@puck.nether.net">alcatel-nsp@puck.nether.net</a><br>
Subject: Re: [alcatel-nsp] Low voltage condition causes CPM2 and IOM2 to fail<br>
<br>
We might have just seen this. The cards never boot and have to be replaced?<br>
<br>
ïÔÐÒÁ×ÌÅÎÏ Ó iPhone<br>
<br>
Jun 26, 2013, × 5:10 PM, "Koch, Andrew" <<a href="mailto:andrew.koch@tdstelecom.com">andrew.koch@tdstelecom.com</a>> ÎÁÐÉÓÁÌ(Á):<br>
<br>
> We have run into a couple instances where on a -48v DC system, we have had the office voltage drop below 42v. šWhen this occurs, the CPM2 and IOM2 on our 7750 routers fail to restore when appropriate power levels are restored. šIn both instances, multiple components (both CPMs, or multiple IOMs) have simultaneously failed to boot on the chassis. These failed components do not POST. šIt appears some type of memory corruption or zeroing occurs.<br>
><br>
> Has anyone else seen these troubles?<br>
><br>
> Thanks for any thoughts.<br>
><br>
> Andy Koch<br>
> TDS Telecom - IP Network Operations<br>
> <a href="mailto:andrew.koch@tdstelecom.com">andrew.koch@tdstelecom.com</a><br>
><br>
><br>
><br>
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