Finally the master issues a broadcast readwrite on the system clock, which will make the first slave the reference clock and forcing all other slaves to set their internal clock appropriately with the now known offset.
32.
In comparison to the other methods described later on, a coarse counter has a very limited resolution ( 1ns in case of a 1 GHz reference clock ), but satisfies with its theoretically unlimited measuring range.
33.
The function of the PLL is to compare the distributed clock to the incoming reference clock, and vary the phase and frequency of its output until the reference and feedback clocks are phase and frequency matched.
34.
To keep the wall clock in sync with the reference clock, each week the owner compares the time on his wall clock to a more accurate clock ( a phase comparison ), and he resets his clock.
35.
The RFC included an analysis of all sources of error, from the reference clock down to the final client, which enabled the calculation of a metric that helps choose the best server where several candidates appear to disagree.
36.
On any given day, is the Sun at its highest in the sky at exactly the same time in all places with the same longitude ? ( By " same time " I mean same time as measured by a single reference clock.
37.
This situation can be caused by a fault affecting an NE in such a way that it has been left without a reference clock, and therefore it has chosen an alternative synchronization : a signal that has turned out to be the same signal, returning by another route.
38.
Common resources that are supported are ports ( for external input and output ), timers ( that allow timing to a reference clock ), channels ( that allow communication and synchronization between threads within a core, and threads on different cores ), locks ( which allow controlled access to shared memory ), and synchronizers ( which implement barrier synchronizations between threads ).
39.
Of course, the most basic of properties such as rest mass and it's associated frequencies are invariant with reference frame so we do not have to redefine the second since all the clocks at rest [ and at the same potential ] with the reference clock will be ticking at the same rate .-- talk ) 21 : 39, 18 November 2016 ( UTC)
