On Mon, 16 May 2005, Steve Underwood wrote: > >It is possible, though complicated, to synchronize the 2Mbit clocks on two > >unrelated cards by measuring the accumulated phase shift (difference in > >interrupt rate) over time and compensating, thus implementing a PLL in > >software. Digium has not shown any intereset in such a solution. It is not > >clear if the internal hardware clock generator can be fine tuned enough to > >implement this. > > > > > How can that work? You can measure the error, but you have no ability to > tweak the clock from software. Two cards could only be synced by hardware.
In most hardware the clock you use is not provided by a crystal. Rather the crystal provides a reference for a pll. The conversion factor between the crystan and the derived clock is usually tunable. Whether the actual clock on the Digium cards is tunable enough I do not know. There are quite a few references to programming the clock in the source. Peter _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
