[j-nsp] Power failure - unexpected?

[Raniery Pontes]

Thanks for the reply.

The "problem" is we´re using AC power supplies and documentation for 
these modules (thanks Steinar) is less detailed than for DC power 
suplies. In my case it seems it doesn´t matter *which* module is turned 
off (differently from DC power suplies).

 From the same doc:
"A minimum of three AC power supplies provides full power redundancy.If
one power supply fails or is removed, the remaining power supplies 
instantly assume the entire electrical load. Two power supplies provide 
the minimum configuration with full power for as long as the router is 
operational."

The last sentence is really unclear to me. I still don´t know in what 
FPC/PICs/hardware combinations I can turn off 2 power supplies without 
turning off the router.


Raniery


James Cornman escreveu:
> From what I recall, The m320 in DC mode, power supply 1 is redundant for 
> supply 0, and 3 for supply 2. So assuming you have a redundant power 
> supply powered for your maintenance, it should not have caused an issue. 
> Meaning, if you have 0 and 2 powered, and powered off 1 or 3, it should be 
> fine. The power layout on the M320 is a bit confusing and i've gotten 
> caught with this same problem. Certain aspects of the chassis are powered 
> by the 2 sets of power supplies. Meaning if you turn off power supplies 2 
> and 3, your SIB/SFM modules could lose power, or FPCs in slots 4 thru 7 or 
> something could lose power. I'm not sure of the exact specifics, the 
> document that was linked earlier can help.
> 
> 
> Good luck
> 
> On Thu, 5 Apr 2007, sthaug at nethelp.no wrote:
> 
> | >   we´ve got an M320 with 4 power modules, a single routing engine and 
> | > the following FPC´s:
> | > 
> | > 1 FPC type 1 (with 2xGigE)
> | > 1 FPC type 2 (with 3xOC-48)
> | > 1 FPC type 3 (with 2x10GE)
> | > 
> | > During a maintenance, we had to turn off only 2 power modules, but 
> | > unfortunately the whole box went down ...
> | > 
> | > According to docs, I was expecting the router to stay up and running, 
> | > once this is not a fully "loaded" router (without lots of FPC type 3, 
> | > for instance).
> | > 
> | > What went wrong ? ;)
> | > 
> | > Are there circumstances where I can turn off 2 power modules and M320 
> | > stay running?
> | 
> | It depends on type of power module (AC or DC) and *which* modules you
> | remove. An M320 can operate with two out of four DC power supplies (we
> | have verified this):
> | 
> | http://www.juniper.net/techpubs/hardware/m320/fru-m320-dc-power-supply.pdf
> | 
> | and from what I can see, it can also operate with two out of four AC
> | power supplies:
> | 
> | http://www.juniper.net/techpubs/hardware/m320/m320-ac-power-supply-fru/m320-ac-power-supply-fru.pdf
> | 
> | Steinar Haug, Nethelp consulting, sthaug at nethelp.no
> | 
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