[j-nsp] Activating FPC's on an EX8208

[Tom Storey]

Interesting, Ive got a couple of MX960's with high line AC PEMs in front of
me, and if I only turn one of them on, I only get half a router powered up.
As far as I know, there is still zoning with high line AC PEMs.

PEM0 and PEM2 supply one half of the router (slots 0-5 and RE0 and one fan
tray), and PEM1 and PEM3 the other half (RE1 and slots 6-11 and the other
fan tray) - as I understand it.

So we do PEM0 and PEM1 as A feeds and PEM2 and PEM3 as B feeds, therefore
if you lose A or B the router keeps running with all slots.

So 2 may be mandatory, but you have to do one for each zone.

Smaller boxes like MX240 we can power entirely with a single PEM.

On 5 March 2015 at 13:01, Kevin Wormington <kworm at sofnet.com> wrote:

> That's right the power zones are only for DC power.  AC has only one zone,
> but according to the link below 2 high line AC supplies are mandatory and 3
> low-line.  I guess it might come up on a single high line depending on what
> line cards you have.
>
> http://www.juniper.net/documentation/en_US/release-
> independent/junos/topics/reference/specifications/calculating-power-
> requirements-mx480.html
>
>
> On 03/05/2015 12:48 AM, Mark Tinka wrote:
>
>>
>>
>> On 4/Mar/15 18:21, Kevin Wormington wrote:
>>
>>> I don't have any experience the the large EXs, but is there a chance
>>> you don't have enough power to the chassis to bring the line cards
>>> online? I know the larger MXs require a certain number of supplies and
>>> IIRC certain supplies power certain slots.  So if you just have one
>>> supply plugged into 120VAC it may not bring the line cards online.
>>>
>>
>> For the MX routers, I think this is only if you run DC or the AC low
>> power units (i.e., 120VAC).
>>
>> IIRC, a single 240VAC PSU on an MX should be able to drive an entire MX
>> chassis, non?
>>
>> Mark.
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