I've been running Ruckus r550 APs for the last year or so at my small office. I jumped at the chance to get a used Ruckus 7150 c12 (my first time trying out a managed switched).
All of the ports work fine if I plug a power supplies into the Ruckus APs, but if i remove the power supplies, the c12 is only able to POE 4 APs, and it gives me the "power disabled on port XXX because of power management" message in console.
I've searched long and far and don't know what to do.
Below is the info from my switch via console (show version, show inline power, show inline power detail):
Thank you in advanced!
SSH@ICX7150-C12-Switch> show version
Copyright (c) Ruckus Networks, Inc. All rights reserved.
UNIT 1: compiled on Dec 16 2021 at 03:40:25 labeled as SPS08095f
The All ports working when the APs connected have a power supply connected to them, is due to the reason : that the Power requirement of the APs being full-filled by the Power Brics/ Power Adapters powering the APs.
When they are connected directly on the switch, their power requirement is full-filled via PoE coming from the switch.
here usually there is a rating for how much power can be delivered by a switch on its own.
in this case on the unit : ICX7150-C12-Switch : by the output of show inline power. SSH@ICX7150-C12-Switch>show inline power Power Capacity: Total is 124000 mWatts. Current Free is 1600 mWatts.
the shows implies that the switch capacity : 124000mWatts : i.e. 124 Watts of PoE power. that implies that the switch would have a pool : 124W to deliver to APs connected to it.
here in our case : based on the detection data : ............
we have each APs drawing a reservation of 28850 : thats for class 4 PoE+. the 4 reservations : are taking up 122400mWatts : i.e. 122.4 W
removing the reservations from pool : 124W - 122.4 W = 1.6 W remains.
hence when fifth AP is connected : the error : power disabled on port XXX because of power management
would come as PoE power pool would have no sufficient power to reserve for the fifth AP.
now the question comes : about why this reservation : when detection of PoE happenes on the switch based on the end device automatically, power class/ PoE Class of the end device is sensed and the reservation takes place based on that.
for Class 4 28850 to 30000 mWatts is generally the range,
hence this is why, when connected along with Power Brics/ Power Adapters, All ports on the switch can assist with a AP connection : as the switch does not have to worry about powering up the AP. when the APs power is dependant on the switch, and we have more APs, it is generally suggested to have a check on switch PoE capacity. based on which we can decide if all APs can be powered up by the switch or not.
Thank you for your reply! I appreciate your detailed answer. So for the 7150 c12, it is only capable of POE powering 4 r550 APs? If i want to connect more r550s to it, I'll need to use a POE injector, or have the AP near a power outlet so i can plug in a power supply?
Apologies for the delay ! , the last response I had made must have gotten lost as i refreshed the page.
regarding the bit where 7150-c12 can having only 4 APs. this is dependent on the PoE power Pool of the switch and PoE Class of AP. Here as its Class 4, we see a reservation of around ~30W on the switch, so that the capacity of the switch - the total reservation taken out by the APs : 124W - 4(~30W) = 4W remaining.
Now the Question would arise : why reserve a large amount : well when we check on the APs : at the time of Boot or POST : that can consume upto : 20-21 Watts, and there would be variation seen when on full load as well. Also there is Factor to consider that the Loss seen during the transmission of Power from the switch over the cable to the AP. hence there is always a distance limit mentioned to how far of a cable run can be had on specific CATx ethernet cable when working with PoE Based end points, beyond which loss can impact the total power delivered.
Considering all that, the bit of having the Adapters / PoE injectors does sound good over the option of having them placed next to an power outlet,
However, there are few switches that do delivers upto 1440W or higher in PoE Capacity, one of these Units should be able to meet the Requirements : Do have look at the Specs data shared below :
they would generally be a 48 port one : hence that should help.
there is one bit, I did not mention about the bit that we can set power statically on the Switches : as we see that the Power used versus the allocated there is a difference. we can do this once, the APs are detected and they are working steady, we set the power statically to a specific value, and have the remaining come back to the pool, with that you can have more APs come up. With this however there is one issue that you may face : that is should there be a reboot of the switch done during activity / or a power outage reboots the switch : then there could be issue where the APs may not get enough power for completing POST. Considering that having the switch autosense the PoE class of the AP and supply the Power would be better.
hence from the options you have shared : using injectors [ is they are being used already ] looks to be a better option than placing next to a power outlet, however if there are quite a number of APs , then would suggest to look for switch with Higher PoE capacity as that can be a better choice there.