[time-nuts] Frequency from telco
hmurray at suespammers.org
Sun Sep 24 16:19:20 EDT 2006
Has anybody tried using the phone company as a frequency reference?
Are the telco master clocks locked to GPS or national frequency sources? Or
do they just use their own Cesium box?
Is that a useful way to get a good clock without a GPS antenna?
I worked with T1 many years ago. It wouldn't be hard to extract a signal to
feed to a PLL.
Has anybody done that and collected data? I'd expect lots of short term
jitter and wander but the long term should be pretty good.
Does anybody know how DSL works? If I poke around with a scope in my DSL
modem/router, will I find a clock locked to the telco's master clock?
How many different versions of DSL are there?
The suespammers.org mail server is located in California. So are all my
other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited
commercial e-mail to my suespammers.org address or any of my other addresses.
These are my opinions, not necessarily my employer's. I hate spam.
More information about the time-nuts