Adam,
Is the POE source 802.3bt compliant or is this Cisco's UPOE proprietary variant?
The AP-535 definitely can be powered from a single 802.3bt source and operate without restrictions, but it may not identify the switch as such.
Can you check the output from the following CLI command?
show ap debug system-status ap-name <name> | begin "Power Status"
Note that even when it's on class 4 POE. the AP-535 only applies two restrictions: the USB port is disabled, as well as the second/other Ethernet port.
If those features are critical, you could consider enabling the IPM feature, which will only apply restrictions when really needed (based on real power consumption), and allows you to define the order/priority of restrictions that may get applied.
Since there's a big difference between typical and worst-case power consumption, of APs and most APs are operated and configured in a way that worst case power consumption is never reached, the IPM feature can help to take advantage of that.
In 99% of AP-535 deployments, this AP will not need more than class 4.
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Onno Harms
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Original Message:
Sent: May 25, 2022 10:41 AM
From: Adam Newson
Subject: AP-535 and single 802.3bt POE
We currently have some AP-535s connected to a Cisco Mgig capable switch on a single power supply, but the AP is still only requesting 802.at POE+ instead of 802.3bt POE++ despite the switch being capable of allocating 60w per switchport.
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Fi1/0/36 auto on 27.5 Ieee PD 4 60.0
The switch has more than enough power budget:
Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 1745.0 272.0 1473.0
It may be difficult for us to get an additional power supply to the APs for various complicated reasons, so we were hoping to be able to power the APs with a single 802.3bt power supply - as stated on the 530 data sheet, in order to run without restriction. Currently these APs will be operating in restricted mode, due to inefficient power supply.
We have other AP-535s across our estate which have 2x 802.3at power supplies which then run at 802.3bt. It is definitely possible to run on a single 802.3bt?
Where does the problem lie?
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Adam Newson
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