Brooke, 25 MHz (and to a lesser extent 50 MHz) is used to clock Ethernet PHYs. It's multiplied up to the various clocks needed internally (125,250,625 MHz etc.)
-Eric On Wed, Dec 14, 2011 at 7:13 PM, Brooke Clarke <[email protected]> wrote: > Hi Pete: > > Maybe you can shed some light on the common xtal frequencies table where > there's no explanation given? > http://www.prc68.com/I/pdf/Crystal_Freq.pdf > An answer is not it's an "even" frequency or "it's an even binary frequency. > That's true for most of these and the factors are part of the table above. > The question is why do they exist? > such as: > 32.0 kHz > 40.0 > 75.0 > 76.79 > 76.8 > 76.81 > 96.0 > 3.072 MHz > 4.0 > 4.096 > 5.0 > 6.0 > 7.3729 > 8.0 > 8.192 > 9.8304 > 10.0 > 11.0 > 11.0592 > 11.2896 > 12.0 > 12.288 > 12.352 > 13.5 > 14.31818 > 15.36 > 16.0 > 16.384 > 17.734475 > 18.0 > 18.432 > 19.6608 > 19.44 > 22.1184 > 24.0 > 24.567 > 25.0 > 25.175 > 28.63636 > 30.0 > 1.4204058 GHz > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/Brooke4Congress.html > > > Peter Bell wrote: >> >> It's exactly 52 times the 1.2288MHz reference that IS95/CDMA2K uses - >> this may be a coincidence, but I somehow doubt it. >> >> Regards, >> >> Pete >> >> >> On Thu, Dec 15, 2011 at 3:46 AM, Joe Leikhim<[email protected]> wrote: >>> >>> I have been watching this thread and may have missed something. My >>> questions: What is the purpose of the outboard OCXO VECTRON 63.8976Mhz? >>> What >>> model number does this RB most closely resemble? >>> >>> -- >>> Joe Leikhim >>> >>> Leikhim and Associates >>> Communications Consultants >>> Oviedo, Florida >>> >>> www.Leikhim.com >>> >>> [email protected] >>> >>> 407-982-0446 >>> >>> Note to GMail Account users. Due to an abnormally high volume of spam >>> originating from bogus GMail accounts, I have found it necessary to block >>> certain GMail traffic. Please phone me if you believe your message was >>> not >>> received. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- --Eric _________________________________________ Eric Garner _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
