[j-nsp] EX4200-48PX/PoE+

[Ben Dale]

On 07/02/2013, at 8:32 PM, Nikolay Abromov <nabromov at gmail.com> wrote:

> Is there any workaround like on Cisco by using RPS?
> 

I assume you're comparing against the 3750X - if you are be sure to check the data sheet very carefully - ignore the marketing blurb at the about full PoE+ at the top:

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps6406/data_sheet_c78-584733.html

you'll see that the only switch that drives 30W per port on every port simultaneously is the *24-Port version* with the 1100W power supplies in it (800W PoE budget).  The 48 Port version still has a maximum PoE budget of 800W - that's ~16W per port which is not much more than standard PoE on everyone else's switches.  I don't think using the RPS changes this at all.

On the Juniper side of the fence, it's exactly the same - EX4200-24PX with the 930W PSU has a PoE budget of 740W which will let you drive 30W per port, but the same power supply on the 48PX port version will halve that average across all ports.

As a side question - are you sure you really need to drive 30W to *every* port simultaneously?

Ben


> 
> 
> On Thu, Feb 7, 2013 at 10:10 AM, Mark Menzies <mark at deimark.net> wrote:
> 
>> 4200s can be given a 900 watt power supply (cant recall the exact wattage)
>> however form my understanding is that the current EX range can support POE+
>> but as you pointed out, the PSUs cant provide a full 30W to all ports.
>> 
>> So in essence, as I understand it we can have POE+ but not on all ports at
>> same time.
>> 
>> 
>> On 7 February 2013 09:33, Nikolay Abromov <nabromov at gmail.com> wrote:
>> 
>>> Hello Group,
>>> 
>>> You might be able to help on that question:
>>> 
>>> It is written on this table (table 1), that EX4200-48PX does support PoE+
>>> (802.3at/30W per port).
>>> However, the PoE budget is equal to 740 W, which means PoE (740/48 =
>>> 15.4).
>>> I am really confused.
>>> Does this platform support full PoE+ on all 48 ports or it does support it
>>> only as protocol,
>>> but doesn't have enough power to provide 30W on each port (which means
>>> 1440
>>> W for PoE budget).
>>> 
>>> 
>>> 
>>> Best Regards,
>>> Nikolay Abromov
>>> _______________________________________________
>>> juniper-nsp mailing list juniper-nsp at puck.nether.net
>>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>>> 
>> 
>> 
> 
> 
> -- 
> Nikolay Abromov
> Mobile +44(0)7414678017
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp
>