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

[Michael Loftis]

MX960 is different than MX480 and MX240  WRT the power requirements,
it also differs for high power stuff (All newer chassis) IIRC.  Two
zones, not one big zone, two 1+1 redundant zones,  PEM 0/2 and 1/3.

Zoning or no zoning depends on your *chassis* not your PSUs.

On Thu, Mar 5, 2015 at 7:30 AM, Tom Storey <tom at snnap.net> wrote:
> 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.
>>> _______________________________________________
>>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>>>
>>>  _______________________________________________
>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>>
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp



-- 

"Genius might be described as a supreme capacity for getting its possessors
into trouble of all kinds."
-- Samuel Butler