Overview

This article demonstrates four different configurations for a PoE Bridge with airMAX devices.

NOTES & REQUIREMENTS: This article covers different possible combinations using a NanoStation 5AC as an example. Different devices have different power specifications, please remember to always verify powering data in each device's Data Sheet and Quick Start Guides (links to these can be found at the bottom of the specific product pages in https://www.ubnt.com/products/).

Table of Contents

1. Traditional: Two Devices and Two PoE's
2. PoE Passthrough: Two Devices and One PoE
3. PoE Linking: Two Independently Powered M Devices and One PoE
4. PoE Bridge: Two Devices and Two PoE’s
5. PoE Bridge and Passthrough: Three or Four Devices and Two PoE's

Traditional: Two Devices and Two PoE's

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PoE Passthrough: Two Devices and One PoE

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This configuration is only possible when the UBNT device has a secondary Ethernet port which can be activated for PoE Passthrough. When enabled, the device allows Power over Ethernet (PoE) power to pass from the main port to the secondary port, thereby powering an additional device. From within the airOS configuration console, navigate to the Advanced tab, go to Advanced Ethernet Settings and enable PoE Passthrough.

PoE Linking: Two Independently Powered M Devices and One PoE

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This is only valid for airMAX M devices. It is a similar configuration to the previous one, but with an added feature. If you power the first radio through the "Secondary" port rather than the "Main" port, power is not lost to the next device if the first radio is rebooted.

ATTENTION: For this configuration, do NOT enable PoE Passthrough as referenced in the section above. The PoE Passthrough option must be left unchecked in the Ethernet Settings section.

PoE Bridge: Two Devices and Two PoE’s

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For this configuration , there is no need (and also no possibility) of a switch or router.

PoE Bridge and Passthrough: Three or Four Devices and Two PoE's

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This configuration is only possible when the UBNT device has a secondary Ethernet port which can be activated for PoE Passthrough. When enabled, the device allows Power over Ethernet (PoE) power to pass from the main port to the secondary port, thereby powering an additional device. From within the airOS configuration console, navigate to the Advanced tab, go to Advanced Ethernet Settings and enable PoE Passthrough.

NOTE: We recommend upgrading the PoE power supply to a model that outputs 24Watts like the POE-24-24W (100Mbps) or POE-24-24W-G (1Gbps) when powering a second unit via PoE Passthrough.