Troubleshooting Tip: Radio 3 from FortiAP K series not working (WiFi 6 and 7 not working)

[laltuzar]

Description	This article describes limitations with FortiAP K series PoE modes and what works.
Scope	FortiAP 441K and FortiAP 443K.
Solution	Series K FortiAPs can be energized through the PoE and DC adapters. When connected through a DC adapter or PoE 802.3bt (60W to 90W), the FortiAPs K series will work on its 'Full mode': 802.3bt / DC : Full – Tx Power Full ; Chain 4x4; USB Enabled Whereas while connected through PoE 802.3at, the FortiAPs K series will work with Radio 1 (2.4Ghz) and Radio 2 (5GHz) at 17dBm maximum and USB will be disabled. Essentially, they will be working on 'Low mode': 802.3at : R1(2.4Ghz) and R2(5 GHz) operation in Low Tx Power 17dBm ; Chain 4x4; USB – Disabled This information can be confirmed in the FortiAP datasheet. It is possible to verify which mode a FortiAP is working in by executing the command below on the FortiAP CLI: cw_diag power For example: ================================================================================ OUTPUT of command cw_diag power: ================================================================================ Power Detection Data: dc=0 ps1=1 af1=0 at1=1 psv1=0 bt1=0 ps2=0 af2=0 at2=0 psv2=0 bt2=0                       Budget lldp 22,0 poe 25,0 (dc=99 af=13 at=25 psv=60 bt=50 full=43.0 low=24.9) Current   Power Mode: low (4)  Oper Power Mode: low (4)     Radio 1: MaxTxpower 37 TxChainMask 0x01 RxChainMask 0x01     Radio 2: MaxTxpower 37 TxChainMask 0x01 RxChainMask 0x01     Radio 3: MaxTxpower 17 TxChainMask 0x01 RxChainMask 0x01     Radio 4: MaxTxpower 17 TxChainMask 0x05 RxChainMask 0x05         USB: disabled full:usb,all radios,txpower full,chain 4; high:2G/5G radio,txpower 17dBm,chain 2; low:disable all radios In this example, it can be observed that the FortiAP is working with a PoE 802.3at, which means that the FortiAP will work with Radio 1 (2.4Ghz) and Radio 2 (5GHz) at 17dBm maximum, Radio 3 (6GHz) will be disabled and USB will be disabled.