eugene...@sbcglobal.net wrote:
> On Feb 10, 5:30 pm, n...@tla.org (John Ioannidis) wrote:
> > The problem setup: two locations, both within the United States, neither
> > has roof access so no GPS reception is possible. How do you synchronize
> > them with better than 50-microsecond accuracy?
>
>Actually, 50E6 seconds is 578 days. It's not out of the question to
>have a third clock always sync-ed to GPS, fed off a 48V battery, and
>drive it to the data centers twice a year to slave the local oscillators.
Thanks for catching my fat-finger. Yes, that's what I was fishing for.
--
The
Hal Murray wrote:
> In article <49920e17.6050...@tla.org>,
> n...@tla.org (John Ioannidis) writes:
>> The problem setup: two locations, both within the United States, neither
>> has roof access so no GPS reception is possible. How do you synchronize
>> them with better than 50-microsecond accur
Hal Murray wrote:
> In article <49920e17.6050...@tla.org>,
> n...@tla.org (John Ioannidis) writes:
>> The problem setup: two locations, both within the United States, neither
>> has roof access so no GPS reception is possible. How do you synchronize
>> them with better than 50-microsecond accur
In article <49920e17.6050...@tla.org>,
n...@tla.org (John Ioannidis) writes:
>The problem setup: two locations, both within the United States, neither
>has roof access so no GPS reception is possible. How do you synchronize
>them with better than 50-microsecond accuracy? Straight NTP over the
n...@tla.org (John Ioannidis) writes:
>The problem setup: two locations, both within the United States, neither
>has roof access so no GPS reception is possible. How do you synchronize
What about window access? And since you have money, I am sure that your
building does have a roof. Stick a c
John Ioannidis wrote:
> The problem setup: two locations, both within the United States, neither
> has roof access so no GPS reception is possible. How do you synchronize
> them with better than 50-microsecond accuracy? Straight NTP over the
> Internet doesn't do the trick. They don't need to
On Feb 10, 5:30 pm, n...@tla.org (John Ioannidis) wrote:
> The problem setup: two locations, both within the United States, neither
> has roof access so no GPS reception is possible. How do you synchronize
> them with better than 50-microsecond accuracy?
You might want to consider a CDMA receiv
The problem setup: two locations, both within the United States, neither
has roof access so no GPS reception is possible. How do you synchronize
them with better than 50-microsecond accuracy? Straight NTP over the
Internet doesn't do the trick. They don't need to actually be
synchronized to
