Tobias Diedrich wrote: > Power down phy on disabled switch ports. > > Haven't measured this myself yet, but according to this > http://www.8devices.com/community/viewtopic.php?f=6&t=156 > it can save about 300mW of power.
Ok, I did some measurements now on the Carambola: Measured on the 12V rail, with WiFi off, LAN cable on port 0: Phy in PDOWN Current (mA) Power (mW) 0-4 65 780 1-4 88 1056 2-4 114 1368 3-4 119 1428 4 124 1488 none 130 1560 0 105 1260 0-1 80 960 0-2 75 900 0-3 70 840 0-4 65 780 So this saves about 5mA per completely unconnected port and about 25mA per port with a transceiver. So disabling the unconnected 3 ports by default would save about 180mW. On a device with an external switch all 5 ports could be powered down, which should save about 300mW. -- Tobias PGP: http://8ef7ddba.uguu.de _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
