Use dual LAN ports of Wifi AP as unmanaged switch

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rvjr wrote:

I'm looking for a Wifi5 or 6 access point, powered via PoE, which can provide an additional port for another device.

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PoE pass-through is available in the market for very small switches and low-power devices only, for example on the GS105PE. this isn't an advice for this model - check the https://kb.netgear.com/25541/GS105PE-PoE-troubleshooting to get an idea about the challenges. No way to make the magic you expect for driving beasts like a WAC540 (three WiFi 5 radios), or a even more power hungry WAX630 or 630E (three WiFi 6 2.4/5 GHz radios resp. two WiFi 6 2.4/5 GHz radios plus 6 GHz radio. The key reason for having dual Ethernet ports is to bring more bandwith to these APs. Magic wonders are not possible (or much to expensive should there be a niche product). Needless to say, this would require even more power than what eg. a WAC540 or a WAX630/630E would require - on top of for what would be required for powering a switch... 

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rvjr wrote:

I basically want a very flat device to sit behind my LG TV and provide reasonably fast Wifi in the room,

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Just design and WAF does never lead to good solutions, certainly not for Wi-Fi. A wireless AP can't provide if hidden and shielded behind shielded electronics. reminds me to this AP I've spotted these days at a customer site - fully shielded in a VA or V2A box:

lMOA 8-((((

PoE pass-through is available in the market for very small switches and low-power devices only, for example on the GS105PE. this isn't an advice for this model - check the https://kb.netgear.com/25541/GS105PE-PoE-troubleshooting to get an idea about the challenges. And again: No, there are no APs which can be powered from a GS105PE. No way to make the magic you expect for driving beasts like a WAC540 (three WiFi 5 radios), or a even more power hungry WAX630 or 630E (three WiFi 6 2.4/5 GHz radios resp. two WiFi 6 2.4/5 GHz radios plus 6 GHz radio. The key reason for having dual Ethernet ports is to bring more bandwidth to these APs. Magic wonders are not possible (or much to expensive should there be a niche product). Needless to say, this would require even more power than what eg. a WAC540 or a WAX630/630E would require - on top of for what would be required for powering a switch... 

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rvjr wrote:

1G LAN to the TV, and connect over a single LAN port to a 1G switch downstairs (which can provide PoE+/++).

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A WAC540 does require PoE+ IEEE 802.3at guaranteeing 25.5W power, a AX630/WAX630E does require IEEE 802.3bt guaranteeing 30.1W power. Leaving alone the 2.5 GbE port (one cable to have enough bandwidth, or two cables to a Gbe switch to provide the bandwidth), you need a really powerful, not inexpensive PoE++ switch.

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rvjr wrote:

Will the dual port devices like the WAC540, WAX630(e) be able to accomplish that?

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No. As stated above: These are always multiple ports to provide the bandwidth these APs need to perform. These two ports available are neither switched nor bridged ports.

There is no magic on PoE/PoE+/PoE++ designs, no tricks, no double floor fun - besides of that is able to power a device as intended.

Regards,

-Kurt