Can't speak for OP, but 100Mbps is half the amount of wires in a cable, so the other 4 could potentially be used for other purposes/machines/computers. Also lower power although is not that relevant for BCM2711 based RPL. Or it might be only 4 wires in the cable.Why would you do that?Hello, I have a question regarding the implementation of web server based applications. Is that possible to configure RPi CM4 Ethernet at 100 Mbps instead of 1000 Mbps ?
Or maybe, as long time ago, once someone at an ISP asked/needed a simple way to limit speed for a webserver. High speed can mean way more traffic, so can mean higher interconnect costs.
Also various PoE modules only use 4 wires. Gbps ethernet will fail then according to standards. Only if 'better than standards', it will work. That is where I lost a lot of time in the past with, typically RPI3B+ 'diskless' TFTP/BOOTP NFSroot and also NBDroot (more like iSCSI). To replace my RPi1Bplus, I would need reliable 100Mbps netboot. As active PoE needs a certain minimum current within a certain timeframe, I also needed extra workaround as otherwise Pi might considered not reacting so power disabled. So now I bought a handful of passive 100Mbps/4wire modules with the intention to do all that power stuff simply myself so I don't have to deal with all sorts of good things in standards in general, but only complicate it for my simple setups at home I anyway need to manage myself.
Statistics: Posted by redvli — Wed Sep 03, 2025 5:52 am