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PoE Requirements for Juniper APs

The following table lists the power over Ethernet (PoE) requirements for Juniper Mist Access Points (APs). The notes below the table provide additional information for understanding the dynamic power mode available with most Juniper APs.

Table 1: PoE Requirements for Juniper APs
Generation Model Minimum Power Full Wi-Fi*
Wi-Fi 6E AP64 802.3af 13 watts
AP45 dynamic 29.3 watts
AP34 dynamic 20.9 watts
AP24 802.3af 13 watts
Wi-Fi 6 AP63 802.3at 25.2 watts
AP43 802.3at 25.5 watts
AP33 802.3af 19.5 watts
AP32 802.3af 19.5 watts
AP12 802.3af 12.9 watts
Wi-Fi 5 AP61 802.3at 19.5 watts
AP41 802.3at 19.5 watts
AP21 802.3af 12.9 watts
Other BT11 802.3af 5.5 watts

* Power required at the power device to support all Wi-Fi radios and all spatial streams.

Full Power, Reduced Functionality, and Insufficient Power

Although you may be able to power up an AP from any given PoE interface, if the interface does not meet the requirement for full power, the performance of the AP will be unpredictable. In this case, a warning appears on the Access Points dashboard, indicating either that the AP is running with reduced functionality (dynamic power mode), or that the AP is only able to connect to the cloud.

Figure 1: Reduced PoE Power Reduced PoE Power

To see the exact power required, power requested, and power allocated for a given AP, click the AP name in the Access Point list, and in the screen that appears, scroll down to the Power Mode section.

Dynamic Power Mode

Many Juniper Mist APs can leverage a dynamic power mode which allows them to automatically reduce their operating capabilities according to the power available, for example by reducing from 4x4:4 spatial streams to 2x2:2 spatial streams.

  • AP45 —Requires 802.3bt for full functionality. The dedicated scanning radio and BLE are always active regardless of power.

    • At 802.3af, the AP45 can connect to the cloud only to let you know it needs more power.
    • At 802.3at power, with any two data radios enabled, an AP45 can operate both radios in 4×4 mode. With three data radios enabled, the AP will operate in 2×2 mode on 2.4 GHz, 4×4 mode on 5 GHz, and 2×2 mode on 6 GHz. With three data radios enabled and dual 5 GHz, the AP operates in 2×2 mode on one 5 GHz radio and 4×4 mode on the other, or 2×2 mode if both the 5 GHz and 6 GHz radios are enabled.

  • AP61 or AP61E, AP63 or AP63E—Always require 802.3at or PoE+ (because these APs consume a maximum of 25.5W).

  • AP41 or AP41E, AP43 or AP43E—Always require 802.3at or PoE+ (because these APs consume a maximum of 25.5W).

  • AP34—At 802.3af, the AP can connect to the cloud, but only to let you know it needs more power.

  • AP33/32—At 802.3af power, the 5-GHz radio operates in 2×2 mode instead of 4×4 mode. Eth0 port operates at a maximum speed of 1 Gbps Eth1 port is disabled.

  • AP24 and AP64—Always require 802.3af.

  • AP12 —Only requires 802.3at if using PoE out; otherwise, 802.3af power is sufficient.

More Information

The IEEE 802.3bt Power over Ethernet (PoE) standard provides for Ethernet cables to carry up to 90 watts of DC power for connected devices (by means of 4 twisted pairs). The IEEE 802.3at-2009 PoE+ PoE standard provides for up to 25.5 watts, while IEEE 802.3af-2003 PoE standard provides for up to 15.4 watts (by means of 2 twisted pairs).

PoE injects DC power onto a standard twisted pair Ethernet cable without disturbing the data traffic being transmitted over the same cable. The power sourcing equipment (PSE), such as a supported Juniper switch, supplies the power and the powered device (PD), such as a Juniper Mist AP, gets its power from the switch. Because Ethernet is an isolated network, each twisted pair connects to a different data transformer.

When connecting to either an 802.3at or 802.3af interface, most Juniper Mist APs use hardware detection to determine the PoE interface type. AP45 AP43, and AP34 will also detect BT power. After the hardware detection, the APs use LLDP, when available, to negotiate their specific power requirements.

Note that for most Cisco switches, LLDP is disabled by default so you must enable it on the interface before connecting an AP that requires 802.3at or higher, otherwise the interface will support 802.3af only.