on 09-12-2016 09:43 PM
I have replaced some old WAPs with 215 instant, I just plug the old POE injector in and apparently the old injectors are 48V, the new Aruba 215 is 54 VDC, but it is still working?
Do we need to get the new POE injector or it still works or it will drop with high load???
09-12-2016 09:50 PM - edited 09-12-2016 09:52 PM
Hi There, I am not sure where you are getting 54V from? The IAP-215 and AP-215 are shown as needing 48V DC using POE. It is preferred to use POE+ in order to use the USB port, but if you don't need that, then POE (802.3af) is fine. Here are the specs from the AP-215 series spec sheet, for your reference: Power • Maximum (worst-case) power consumption: 14.9 watts (PoE) or 13.6 watts (DC) --Excludes power consumed by external USB device (and internal overhead); this could add up to 6 watts (PoE) or 5.5 watts (DC) for 5W/1A USB device • Maximum (worst-case) power consumption in idle mode: 8.2 watts (PoE) or 7.4 watts (DC) • Direct DC source: 12 Vdc nominal, +/- 5% • Power over Ethernet: 48 Vdc (nominal) 802.3af/802.3at compliant source --USB port is disabled when using an 802.3af PoE power source; for unrestricted operation with PoE power, use an 802.3at compliant source • Power sources sold separately • When both power sources are available, DC power takes priority So, it looks like you should be fine, as long as your POE injector can handle say 15W max load as the AP shows a max power usage of 14.9W when using POE input (under load)
Hope this helps.
Accucom Systems Integration
on 09-14-2016 09:43 PM
Hmmm, that is strange, I just looked and my 215s, 225s and even the 325s show the same markings, but strangely, only the 325 shows 450mA where the 225s show 350mA like the 215s do.
I assume they are implying the MAX voltage that can be used on POE for these devices as their respective spec sheets all show 48V.
As you can see, the existing POE injector is working so you should be fine.
I can honestly say I have never really noticed that label on the back of the AP before.
Considering that all the APs adhere to 802.3af or 802.3at requirements and standards, depending on the model, then they are probably just putting the max value on the AP.
Excerpt from IEEE on 802.3 below, showing a voltage range of 37-57V depending on the type.
PoE vs PoE+ parameters Property 802.3af (802.3at Type 1) "PoE" 802.3at Type 2 "PoE+"
|Power available at PD[note 1]||12.95 W||25.50 W|
|Maximum power delivered by PSE||15.40 W||30.0 W|
|Voltage range (at PSE)||44.0–57.0 V||50.0–57.0 V|
|Voltage range (at PD)||37.0–57.0 V||42.5–57.0 V|
|Maximum current||350 mA||600 mA per mode|
|Maximum cable resistance||20 Ω (Category 3)||12.5 Ω (Category 5)|
|Power management||Three power class levels negotiated at initial connection||Four power class levels negotiated at initial connection or 0.1 W steps negotiated continuously|
|Derating of maximum cable ambient operating temperature||None||5 °C (9 °F) with one mode (two pairs) active|
|Supported cabling||Category 3 and Category 5||Category 5[note 2]|
|Supported modes||Mode A (endspan), Mode B (midspan)||Mode A, Mode B|
on 09-14-2016 09:47 PM
Thank you very much for your help Chris,
I feel a bit relieve now, mind you, one 215 that I am using use the Cisco POE injector 56V because of that reason continue to freeze, not sure because of the high voltage or else???
Thank you again