Hi Onboard ethernet on the pi model B is hooked into the CPU via the USB port. That may not be best for accurate time.
Bob On Aug 19, 2012, at 1:16 PM, bownes <bow...@gmail.com> wrote: > Why not just use a raspberry pi? Uses a whole 2w at idle. Ntp might bump that > to 2.01. > > > > > > > > On Aug 19, 2012, at 13:06, Chris Albertson <albertson.ch...@gmail.com> wrote: > >> This sounds like a newer version of the board I use. The thing to check >> is if the CPU heat sink has a fan or not. Having no fan indicates that the >> CPU is not using much power. It also removes a common failure point. >> >> To reduce power even more. On an NTP server you can unplug the keyboard, >> mouse and monitor and if you have other servers on the LAN configure one as >> a "boot server" and have it run TFTP then your NTP server does not need a >> disk drive. It can run off a "RAM disk". This makes it very fast, even >> faster than a SSD and it saves some cash. Makes backup easy too as there >> is nothing to backup if there is no local storage. If you don't have a >> TFTP server use a small notebook size disk drive. Even a 80GB drive is >> overkill. You can also boot from a USB thumb drive and run a RAM disk. >> >> It is worth it to look at your electric bill to find how much you pay for >> power. Here I'm at $0.21 per KWH. A full size PC server can use 250W or >> more. There are 8760 hours in a year so you get $460 per year to run that >> 250W PC. The little Atom will pay for itself in just a few months. The >> first time I did that calculation, my "power hogs" where given away. >> >> >> >> >> On Sun, Aug 19, 2012 at 7:42 AM, Stan, W1LE <stanw...@verizon.net> wrote: >> >>> Hello The Net, >>> >>> For your consideration: >>> >>> The INTEL model DN2800mt ITX mother board uses a ATOM CPU and >>> draws about 11 watts of AC power when configured as: >>> (I have not measured DC power yet.) >>> >>> 30 GB OCZ Nocti mSATA solid state drive, >>> WIN7 pro, 64 bit, USB keyboard and mouse >>> APEX MI-0008 case. >>> >>> Also has: >>> parallel port available on mother board, you extend to a connector >>> RS232 serial port available on mother board, you extend to a connector >>> a single DC power supply from 11 to 19 V DC. >>> 1 each PCIe expansion port, I will use with a premium 4 channel sound card >>> SATA ports available for HDD/SDD, >>> USB ports are available, >>> Motherboard sound, and Gigalan. >>> >>> I have not played with NTP, (yet), but it sounds like a decent time nut >>> technical challenge. >>> >>> My application is for a remote site with only 13V DC power available from >>> PV/batteries. >>> Then use fiber ethernet to get off site. >>> >>> The INTEL website would have further details. >>> >>> Stan, W1LE Cape Cod FN41sr >>> >>> >>> >>> >>> ZZZZz >>> >>> >>> ______________________________**_________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/** >>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >>> and follow the instructions there. >>> >> >> >> >> -- >> >> Chris Albertson >> Redondo Beach, California >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.