Hi Somnath, The main clock on the Telos motes runs on an internal DCO which has a lot of frequency error (could be on the order of 10%), unless the error is corrected through periodic recalibration with the crystal.
I believe the timers are run off the 32KHz crystal in TinyOS, which would lead to a worst case of 40ppm freq error. The clock drift is essentially (in sec), drift = (time_since_last_sync)*(freq_error_in_ppm)/1e6. This means that if you don't resync periodically, your clock drift could be unbounded. Hope this answers your question. Zainul. On Sat, Oct 18, 2008 at 1:17 PM, Somnath Mitra <[EMAIL PROTECTED]> wrote: > Hello , > > People who have worked on time synchronization, can anyone please tell me > that - > > Can we say that there is a maximum upper bound on the amount of drift of the > clocks of Telos like platforms ? > > Thanks, > > Somnath Mitra > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
