Passive POE question (RB4011iGS+RM / cAP ac)

RouterOS General
1

I’m brand new to anything POE, so I’m hoping I’m reading things right and have the concepts in my head accurately…

The RB4011iGS+RM has passive POE on port 10, which I’m using to power a single cAP ac. This works great.

I’m curious if it’s possible to chain an additional cAP ac. I’m thinking not, but wanted to check with smarter people…

The RB4011iGS+RM says max output 400mA for < 30v, 600mA for > 30v. I believe the included power supply is 24v, so my max current is 400mA.

The cAP ac looks like it uses 400mA, so plugging into the passive POE output on my existing cAP ac wouldn’t work because the RB4011 can’t supply enough power to both. Is that correct? I would need to use an injector and use another port, or get another POE switch that can output more power / additional POE ports.

2

PoE out for RB4011 actually says 600mA for voltages less than 30V and 400mA for voltages above 30V.

Specs say about cAP ac consumption that it’s 13W without attachments and 24W maximum. I’m not surewhat does count as attachment, but let’s say you want to power “bare” cAP acs, so let’s calculate with 13W per unit. Two connected in series would mean 26W, which at 24V is quite more than 600mA. However, both devices are rated to use up to 57V, so you coukd change power adapter with a 54V one. Sadly, the said 26W would still be around 480mA which is more than maximum output of RB4011 (that is 400mA).

So yes, you came to correctconclusion which is that RB4011can not power two cAP acs off single PoE out port.