Campus Switching and Routing

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New Contributor
Posts: 2
Registered: ‎01-07-2016

S1500-12P power consumption?

I'm considering picking up an S1500-12P for evaluation. Unfortunately, neither the datasheet nor the manual say anything about power consumption. I'm a sucker for efficiency, so I just must know before buying. :)

 

Can anybody share what power consumption is like for the S1500-12P? I'm most interested in the idle figure, i.e. with no ports active.

 

Many thanks in advance!

MVP
Posts: 514
Registered: ‎11-04-2011

Re: S1500-12P power consumption?

Can´t give you the value for no connected ports; but I measure around 40W (on 220V/50Hz power) with 5 ports and 18W PoE draw:

 

(ArubaS1500-12P) #show poe controller   

Linecard  Power Budget(W)  Power Consumption(W)  GuardBand(mW)  PoE Management  Cisco Compatibility  Config Delay(ms)
--------  ---------------  --------------------  -------------  --------------  -------------------  ----------------
0         120              18                    11000          Dynamic         Disabled             2000

 

Earlier, I had three more PoE devices connected total 45W; then the device draw 72W:

Linecard  Power Budget(W)  Power Consumption(W)  GuardBand(mW)  PoE Management  Cisco Compatibility  Config Delay(ms)
--------  ---------------  --------------------  -------------  --------------  -------------------  ----------------
0         120              45                    11000          Dynamic         Disabled             2000

 

See the graph below, the blue line shows the power consumption in Watts, and drops from 72W to 42W after I pulled 27W of PoE devices in the right of the graph (just before 8PM):

Unfortunately, I can´t pull the last device as that is a 7005 controller running my network. I would at least expect another 18W drop if you take off the last 18W of PoE powered devices.

 

The device measuring the power is a Plugwise power plug with just the cable to the switch direct connected in it.

--
If you have urgent issues, please contact your Aruba partner or Aruba TAC (click for contact details).
New Contributor
Posts: 2
Registered: ‎01-07-2016

Re: S1500-12P power consumption?

[ Edited ]

Thank you so much for the detailed reply!

 

Even after subtracting 18 W for the one PoE device, 20+ watts seems like a lot for a fanless switch that's close to idle. Could there have been significant traffic on the other four ports?

 

The Brocade ICX 6430-C12, for example, idles at only 10 watts. The datasheet also states the typical power consumption for 5% and 95% throughput scenarios, which is nice. The HP 2530-8G-PoE+ idles a little higher at 13.4 watts, but that's still very reasonable. I'm waiting to hear back from Juniper about the EX2200-C-12P-2G.

 

I also have a couple of smart/semi-managed PoE+ switches lying around, a D-Link DGS-1210-10P and a TRENDnet TPE-1020WS, both of which idle at ~10 watts.

MVP
Posts: 514
Registered: ‎11-04-2011

Re: S1500-12P power consumption?

Unfortunately, I don't have an idle S1500-12P as my network runs production on that switch. So the 5 active ports are also quite busy... not in idle mode.

--
If you have urgent issues, please contact your Aruba partner or Aruba TAC (click for contact details).
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