[j-nsp] MX960 Power Options

[Kevin Wormington]

Hi Colton,

Do you already have the MX960 or a similarly configured one?  If so, the easiest thing to do is fire it up and issue “show chassis power”.  It will show you how much power is required for the running configuration and you can then do the math to size your circuits accordingly.  In a perfect world you would have a separate supply breaker for each feed rated for the max pull of the power supply.  However, in a data center environment where you are having to order/pay for power feeds an over-sized feed is just going to cost you a lot of money each month for power you aren’t using.

Kevin
> On Jan 26, 2016, at 10:02 AM, Colton Conor <colton.conor at gmail.com> wrote:
> 
> Do most data center providers offer this 400V? The next step up from the
> 208V/30AMP A/B side was a 208V/30A/3-Phase Power A/B side. I have never
> dealt with 3 phase before does the MX960 support 3 phase? Not sure if this
> matters, but the 208V/30A/3-Phase Power is double the cost
> of 208V/30A/Single Phase Power.
> 
> On Tue, Jan 26, 2016 at 9:57 AM, Youssef Bengelloun-Zahr <youssef at 720.fr>
> wrote:
> 
>> Hello Colton,
>> 
>> For that kind of devices using lots of C19 plugs and high wattage PSU
>> (>2kW), you can also go with 400V/30AMP power feeds.
>> 
>> We find that solution more efficient for that particular case, for example
>> when use power 4 blade chassis in a rack (two chassis per pair of plugsets).
>> 
>> Best regards.
>> 
>> 
>> 
>> 2016-01-26 16:50 GMT+01:00 Colton Conor <colton.conor at gmail.com>:
>> 
>>> So from what I gather, there are 4 AC power supplies, and each AC power
>>> supply has two plugs. So thats not really going to change, its more what
>>> power to order from the datacenter.
>>> 
>>> So can I get away with one A side 208V/ 30 AMP circuit and one B side
>>> 208V/30AMP circuit?
>>> 
>>> 208V X 30AMP X .80 Max Load = 4,992 watts. That's a lot.
>>> 
>>> Are you saying I ideally need double this? Why?
>>> 
>>> On Mon, Jan 25, 2016 at 10:20 PM, Chuck Anderson <cra at wpi.edu> wrote:
>>> 
>>>> I recommend 4 x 208V.  The MX960 uses "power zones" in a 2+2
>>>> arrangement where half of the chassis is powered by 2 PEMs, and the
>>>> other half of the chassis is powered by the other 2 PEMs.  Make sure
>>>> the 1st PEM for each zone is powered by the A feed, and the 2nd PEM
>>>> for each zone is powered by the B feed.  For dual-input PEMs, you
>>>> should put both inputs of a single PEM on the same branch circuit,
>>>> either A or B.
>>>> 
>>>> I would use two PDUs to break out the two 208V/30AMP outlets to
>>>> multiple C19's (plus any C13's you need), and then use C19/C20 cords.
>>>> Each branch circuit PDU will have 4 C19/C20 cords connected (2 PEMs x
>>>> 2 inputs per PEM).  Alternatively you could use L6-20 PDU
>>>> outlets/cords.
>>>> 
>>>> On Mon, Jan 25, 2016 at 09:25:02PM -0600, Colton Conor wrote:
>>>>> What are the options for powering a MX960 using AC power? The
>>> datacenter
>>>>> provider is offering us power  in the following options:
>>>>> 
>>>>> 120V/20AMP A/B Power
>>>>> 120V/30AMP A/B Power
>>>>> 208V/30AMP A/B Power
>>>>> 
>>>>> We are leaning towards using a MX960 with 4 AC power supplies and
>>> limited
>>>>> cards installed. More than likely we will order the 208V/30AMP A/B
>>> Power
>>>>> from the datacenter, but want to know if this will be enough? What
>>> does
>>>>> Juniper recommend?
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>> 
>> 
>> 
>> --
>> Youssef BENGELLOUN-ZAHR
>> 
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