About Clock Synchronization

Each Coaxlink card in the system uses its own local hardware clock (hw) to time-stamp hardware events.

The Coaxlink Driver:

● Use the system clock (sys) to time-stamp software events.

●

Converts 'hardware timestamps' into 'system timestamps' taking into account the relative time drift.

● Continuously update the drift correction factors using synchronization points where the hw time is compared with the sys time.

●

Generates Memento messages reporting detailed synchronization information:

ClockSynch::init -> t0.hw = 118933739, t0.sys = 6703754764, error(t0.sys) = 3/2
ClockSynch::init -> tsync.hw = 118933739, tsync.sys = 6703754764, error(tsync.sys) = 3/2
ClockSynch::update -> tsync.hw = 219643369, tsync.sys = 6804461205, error(tsync.sys) = 3/2
ClockSynch::update -> sf = 100706441/100709630, error(sf) = 39719e-12

In the above Memento messages:

□ t0.hw and t0.sys represent respectively the hardware time and the system time of an older synchronization point.

□ tsync.hw and tsync.sys represent respectively the hardware time and the system time of this synchronization point.

□ sf represents the scaling factor.

□ error(value) gives an estimation of the error margin on the value.