I was thinking of buying GS1900-24HP or V2 of this switch and wanted to know if anyone knows the power consumption of this switch. It would be a nice 24 port openwrt router without wifi.
switches are bad routers, expect 30mbit routing throughput.
as for specs, they're listed at https://www.zyxel.com/global/en/products/switch/8-10-16-24-48-port-gbe-smart-managed-switch-gs1900-series/specification
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It is PoE source, +1W per port connected typically.
It will be very bad at NAT type of router,
it can only handle very plain DSA quickpaths ie flat static network routes, IF dsa recognizes them.
for NAT you will need something like rasbery or better.
I thought it was a gigabit switch, i don't need any sqm or anything fancy, just a couple of vlans.
It is a gbit switch ..?
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It is a gigabit switch, not a router
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It is, but just a switch. The hardware is too weak to do routing. It was designed for switching. That it can do at wirespead (gigabit). About any modern day router (MT7621, ARM/ARM64 SoCs) will do routing way better than a GS1900-24HP can. If you need lots of ports, get a good router, put a switch behind.
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If anyone reading in the future knows any ~24 port low power router let me now. X86 rack mount would be nice.
Get one without PoE, but you won't find many 24 port routers out there.
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Get one of these switches - they are affordable and I have added an internal console port for mine. Then only problem with Zyxel GS1900 vs others is the smaller amount of flash. If you can find an HPE JG92xA (JG926A for example) then you get a front console port and more flash space.
Then put a small x86 mini-PC behind that for routing.
There is no such thing as a high-port-count low power switch that does routing. In that context "low power L3 switch" means less screamy than the big 100Gb switches. Most low power routers top out at 5-8 ports. The EdgeRouter-X is a MT7621 device shaped like a small switch with 5 ports that has enough CPU for routing.
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I actually don't need any POE
You were the one who brought it up, by asking about a PoE capable switch.
I might have made a mistake by quoting GS1900-24HP I have no need for POE.
You need to re-select a switch without PoE, probably with l;ess ports if your target is to have less idle power draw.
The company that supplies our power, some years ago, sent me a very useful device that I still use today. I dont know what its real name is but I call it the wattometer I plug the wattometer into the mains supply then plug a device into that and it tells me lots of information about the power being used by that device.
Amperage, wattage, voltage etc etc