A few solutions come to mind.
Ethernet switch in attic.
Wherever that extension cord is connected to power you could extend that circuit from there to the poe and then connect the poe.
If the switch doesn t hold up then you will have to try something else.
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The majority of ethernet switches sold currently will support the 1 gbps speed called gigabit ethernet.
Poke some cable through one end more than you think you need and leave a short spool at the end slowly walk toward the other plate poke cable through done.
Blowing 120 140 degree air from your attic onto a switch isn t going to cool it down below 104 which is the top of the temperature range for the tp link.
Cat 5e may be popular and adequate for today s more basic.
This might keep it running.
If you re in the market for the best ethernet switch for your office have a look at the linksys business lgs105.
Install brush plates go into attic preferably during a time when temperatures are tolerable walk to one end with your coiled cable in arm.
This unmanaged switch promises high end performance and offers five auto sensing ports with connection speeds of up to 1 000mbps.
Commonly ethernet switches support transmission speeds of 10 mbps 100 mbps and or 1 000 mbps or 1 gbps.
Ethernet cabling can provide a faster and longer distance approach to home networking than wi fi but don t skimp on the cables.
Forget using a fan or a switch with a fan.
Here s a step by step guide to wiring your home with cat5e or cat6 ethernet cable.
You can buy an 8 port tp link gigabyte switch for 25.
If you have central ac ducts in the attic you can install the switch in the duct to keep it cool.
What i was commenting on was the extension cord in the attic.
Add a ceiling vent and insulate above it so the switch is in the cooler room air.
Should you make a connection to a device that can use only the 100 mbps speed the gigabit ethernet switch will be backward compatible.
You could take a metal cased switch and add vent holes and a fan.